Lyme disease: Monitoring

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Monitoring of Lyme disease in Canada

Canada monitors Lyme disease to:

  • keep track of the number of human cases of Lyme disease
  • identify areas where blacklegged and western blacklegged tick populations may be emerging
  • identify the areas where people are most at risk of Lyme disease

To get as much information as possible, we work with:

  • provincial and territorial public health authorities
  • researchers and academics

Learn more about:

Monitoring of human cases

Monitoring of human cases is based on reporting of Lyme disease cases by provincial and territorial public health authorities.

Between 2009 and 2024, provincial public health units have reported 27,463 human cases of Lyme disease across Canada.

Number of human reported Lyme disease cases from 2009 to 2024
Year Number of cases
2009 144
2010 143
2011 266
2012 338
2013 682
2014 522
2015 917
2016 992
2017 2,025
2018 1,487
2019 2,634
2020 1,617
2021 3,147
2022 2,525
2023 4,785
Preliminary 2024 5,239

Reported cases of Lyme disease include those that are locally-acquired and travel-related. The national surveillance case definition for Lyme disease, initially implemented in 2009, was revised in 2016 and in 2024. These updates may have impacted the surveillance data, and it is important to consider these changes when interpreting trends.

There’s underreporting because some cases are undetected or not reported. In addition, annual case counts fluctuate due to a combination of factors including:

  • public health prevention efforts
  • variations in weather affecting tick activity
  • variations in human activity such as time spent outdoors or healthcare-seeking behaviors

All provinces and territories voluntarily provided available data over the 14-year period.

Learn more:

Lyme disease risk areas

Blacklegged ticks are spreading to new areas in Canada in part due to climate change. They can also spread by travelling on birds and deer. You can sometimes find blacklegged ticks in areas outside of where they're known to live.

Ticks can be active whenever the temperature is consistently above freezing and the ground isn't covered by snow. You're most likely to encounter ticks during the spring, summer and fall. However, when conditions are favourable, ticks can be active at any time of the year. The best way to prevent Lyme disease is to protect yourself against tick bites. Always take precautions against tick bites when you're in wooded or grassy areas.

The Public Health Agency of Canada, in collaboration with provincial and territorial public health authorities and partners, uses tick surveillance data and reported Lyme disease cases to identify areas where:

  • tick populations may be emerging
  • people are most at risk of Lyme disease

Learn more about:

Check if you're in a risk area. Enter the first 3 characters of your postal code or municipality in the filter field below.

Lyme disease risk areas, 2024
Municipality Postal code areas
Abbotsford V2S, V2T, V3G, V4X
Abercorn J0E
Aberdeen E7L
Acadieville E4Y
Acton Vale J0H
Addington Highlands K0H
Adjala-Tosorontio L0N, L9R
Admaston/Bromley K0J, K7V
Ahahswinis 1 V9Y
Ajax L1S, L1T, L1Z
Akwesasne H0M
Akwesasne (Part) 59 K6H
Alberni-Clayoquot A V0R
Alberni-Clayoquot B V9Y
Alberni-Clayoquot D V9Y
Alberni-Clayoquot E V9Y
Alberni-Clayoquot F V9Y
Alderville First Nation K0K
Alexander R0E
Alleyn-et-Cawood J0X
Alma E4H
Alnwick/Haldimand K0K, K9A
Amherst B2N, B4H
Amherstburg N0R, N9J, N9V
Anmore V3H
Annapolis, Subd. A B0S
Annapolis, Subd. B B0S
Annapolis, Subd. C B0S
Annapolis, Subd. D B0P, B0T
Antigonish B2G
Antigonish, Subd. A B2G
Antigonish, Subd. B B0H,B2G
Argyle  B0W
Argyle  R0K
Armstrong R0C, V0E
Arnprior K7S
Arran-Elderslie N0H
Arundel J0T
Ascot Corner J0B
Asphodel-Norwood K0L
Aston-Jonction G0Z
Athens K0E
Augusta K0E, K6V
Aurora L4G
Austin J0B
Ayler's Cliff J0B
Aylmer N5H
Baie-du-Febvre J0G
Baie-D'Urfé H9X
Barnston-Ouest J0B
Barrie L4M, L4N
Barriere V0E
Barrington B0W
Bath E7J
Batiscan G0X
Bayham N0J
Beaconsfield H9W
Beaubassin East / Beaubassin-est E4M, E4N, E4P
Beauharnois J0S, J6N
Bécancour G9H
Becher Bay 1 V9Z
Beckwith K7C
Bedford J0J
Belcarra V3H
Belleville K0K, K8N, K8P, K8R
Beloeil J3G
Berthierville J0K
Béthanie J0H
Big Grassy River 35G P0W
Blacks Harbour E5H
Blissville E2V, E5L
Bluewater N0M
Boileau J0V
Boisbriand J7E
Bois-des-Filion J6Z
Bolton-Est J0E
Bolton-Ouest J0E
Bonsecours J0E
Botsford E4M
Boucherville J4B
Bouctouche  E4S
Bowen Island V0N
Bowman J0X
Bradford West Gwillimbury L0G, L3Z
Brampton L6P, L6R, L6S, L6T, L6V, L6W, L6X, L6Y, L6Z, L7A
Brandon R7A, R7B, R7C
Brant N0E, N3R, N3S, N3T, N3W
Bridgewater B4V
Brigham J2K
Bright E6E, E6L, E7P
Brighton K0K, E7L, E7N, E7P
Bristol J0X
Brock L0K
Brockville K6V
Brome J0E
Bromont J2L
Brownsburg-Chatham J8G
Brunswick E4C, E4Z
Bryson J0X
Buffalo Point 36 R0A
Burlington L7L, L7M, L7N, L7P, L7R, L7S, L7T
Burnaby V3J, V3K, V3N, V5A, V5B, V5C, V5E, V5G, V5H, V5J, V5K, V5M, V5R, V5S
Burrard Inlet 3 V7G, V7H
Burton E2V
Bury J0B
Cache Creek V0K
Caledon L7C, L7E, L7K
Calixa-Lavallée J0L
Cambridge E4C
Cambridge 32 B0P
Cambridge-Narrows E4C
Campbell River V9H, V9W
Campbell River 11 V9W
Campbell's Bay J0X
Campobello Island E5E
Candiac J5R
Canning E4B
Canterbury E6H, E6L
Cantley J8M, J8V, J9J
Cape Breton B1A, B1B, B1C, B1E, B1G, B1H, B1J, B1K, B1L, B1M, B1N, B1P, B1R, B1S, B1T, B1V, B1Y, B2A
Capilano 5 V7P, V7T
Cap-Pelé E4N
Cardwell E4E, E4G, E4Z
Carignan J3L
Carleton E1N, E4X, E9A
Carleton Place K7C
Carman R0G
Cartier R0G, R4K
Cartwright-Roblin R0K
Castlegar V1N
Cavan Monaghan L0A, K0L
Central Frontenac K0H
Central Kootenay A V0B
Central Kootenay B V0B
Central Kootenay D V0G
Central Kootenay E V1L
Central Kootenay F V0G
Central Kootenay H V0G
Central Kootenay I V1N
Central Kootenay J V0G, V1N
Central Kootenay K V0G
Central Okanagan V1P, V1X
Central Okanagan J V0H, V1H, V1Z
Central Saanich V8M, V8W, V8Y, V8Z
Centre Hastings K0K
Centreville  E7K
Chambly J3L
Champlain K0B, K6A
Chapple P0W
Charlemagne J5Z
Châteauguay J6J, J6K
Chatham-Kent N0P, N8A
Chelsea J9B
Chemainus 13 V9G
Chénéville J0V
Chester B0J
Chesterville G0P
Chichester J0X
Chilliwack V0X, V2P, V2R, V4Z
Chipman E4A
Chippewas of the Thames First Nation 42 N0L
Chopaka 7 & 8 V0X
Clare B0W, B5A
Clarence-Rockland K0A
Clarendon E5L
Clarington L0A, L0B, L1C, L1E
Clearview L0M, L9Y
Clearwater V0E
Cleveland J0B
Coaticook J1A
Cobourg K9A
Cocagne E4R, E4S, E4T, E4V
Colchester, Subd. A B0M
Colchester, Subd. B B0K, B0M, B2N, B6L
Colchester, Subd. C B0N, B2N, B6L
Coldstream V1B
Cole Bay 3 V8L
Cole Harbour 30 B2V
Collingwood L9Y
Columbia-Shuswap C V0E, V1E
Columbia-Shuswap D V0E, V1E
Columbia-Shuswap E V0E
Columbia-Shuswap F V0E
Colwood V9B, V9C
Comox V0R, V9M
Comox 1 V9M, V9N
Comox Valley A V0R, V9N
Comox Valley B (Lazo North) V9J, V9M, V9N
Comox Valley C (Puntledge - Black Creek) V0R, V9H, V9J, V9N
Contrecoeur J0L
Cookshire-Eaton J0B
Coquitlam V3B, V3C, V3E, V3H, V3J, V3K
Cornwall K6H, K6J, K6K
Cornwallis R0K
Coteau-du-Lac J0P
Côte-Saint-Luc H3X
Courtenay V9J, V9N
Coverdale E1J, E4J
Cowansville J2K
Cowichan V9L
Cowichan Valley A V0R
Cowichan Valley B V0R, V9L
Cowichan Valley C V0R
Cowichan Valley D V0R, V9L
Cowichan Valley E V9L
Cowichan Valley F V0R, V9L
Cowichan Valley G V0R, V9G
Cowichan Valley H V9G
Cowichan Valley I V0R, V9L
Crabtree J0K
Cramahe K0K
Cranbrook V1C
Creston V0B
Cumberland V0R
Cumberland, Subd. A B0L, B0M
Cumberland, Subd. B B0L, B0M, B4H
Cumberland, Subd. C B0K, B0L, B0M, B4H 
Cumberland, Subd. D B0K, B0M
Danville J0A, J1T
Dauphin R7N
Daveluyville G0Z
Dawson P0W
De Salaberry R0A
Delta V3M, V3W, V4C, V4E, V4G, V4K, V4L, V4M
Denholm J8N
Deschaillons-sur-Saint-Laurent G0S
Deschambault-Grondines G0A
Deux-Montagnes J7R
Devon 30 E3A
Dieppe E1A, E1C, E1H
Digby B0S, B0V, B0W
Division No. 17, Unorganized R0J
Doaktown E9C
Dollard-Des Ormeaux H8Y, H9A, H9B, H9G, H9H
Dorchester E1H, E4K
Dorval H4S, H4Y, H9P, H9R, H9S
Douglas E3A, E3G, E6B, E6L
Drummond/North Elmsley K0G, K7A, K7C, K7H
Drummondville J1Z, J2A, J2B, J2C, J2E
Duck Lake 7 V4V
Dudswell J0B
Dufferin E3L
Dumbarton E5A, E6K
Dumfries E6G
Duncan V9L
Dundas E1G, E4R, E4V, K0A, K0C, K0E
Dunham J0E
Durham-Sud J0H
East Angus J0B
East Farnham J2K
East Gwillimbury L0G, L9N
East Hants B0N, B2S, B2T
East Hawkesbury K0B, K6A
East Kootenay B V0B
East Kootenay C V0B, V1C
East Kootenay E V1A
East Saanich 2 V8M
East St. Paul R2E
Eastman J0E
Edwardsburgh/Cardinal K0E, K0G
Elgin E4J, E4Z, J0S
Elizabethtown-Kitley K0E, K0G, K6T, K6V
Emerson-Franklin R0A
Enderby V0E
Erin N0B
Eskasoni 3 B1W
Esquimalt V9A
Essa L9R
Essex N0R, N8M, N9V, N9Y
Farnham J2N
Fassett J0V
Florenceville-Bristol E7K, E7L
Fort Erie L0S, L2A
Fort Folly 1 E4K
Fort Frances P9A
Fort William 52 P7J
Fort-Coulonge J0X
Fortierville G0S
Franklin J0S
Fraser Valley A V0K
Fraser Valley B V0K, V0X
Fraser Valley C V0M
Fraser Valley D V0X
Fraser Valley E V2R, V4Z
Fraser Valley F V2V
Fraser Valley G V0M, V2V
Fraser Valley H V2R
Fredericton E3A, E3B, E3C, E3E, E3G
Fredericton Junction E5L
Frelighsburg J0J
Frontenac Islands K0H, K7G
Fruitvale V0G
Gagetown E5M
Gananoque K7G
Gatineau J8L, J8M, J8P, J8R, J8T, J8V, J8X, J8Y, J8Z, J9A, J9H, J9J, K1A
Georgian Bluffs N0H
Georgina L0C, L0E, L4P
Gibsons V0N
Gladstone E5L
Godmanchester J0S
Gold River V0P
Granby J2G, J2H, J2J
Grand Bay-Westfield E5K
Grand Forks V0H
Grand Manan E5G
Grand-Saint-Esprit J0G
Greater Madawaska K0J, K7V
Greater Napanee K0K, K7R
Greater Vancouver A V4N, V6S, V6T, V7W
Greenwich E1V, E5K, E5M
Greenwood V0H
Grenville J0V
Grenville-sur-la-Rouge J0V
Grey R0G
Guelph N1C, N1G, N1L
Guelph/Eramosa N0B, N1H
Guysborough B0E, B0H
Haldimand County N0A, N1A, N3W
Halifax B0J, B0N, B1S, B2R, B2S, B2T, B2V, B2W, B2X, B2Y, B2Z, B3A, B3B, B3E, B3G, B3H, B3J, B3K, B3L, B3M, B3N, B3P, B3R, B3S, B3T, B3V, B3Z, B4A, B4B, B4C, B4E, B4G
Halton Hills L0P, L6Y, L7G, L7J, L9T
Hamilton K0K,  K0L, K9A, L0P, L0R, L1A, L8B, L8E, L8G, L8H, L8J, L8K, L8L, L8M, L8N, L8P, L8R, L8S, L8T, L8V, L8W, L9A, L9B, L9C, L9G, L9H, L9K
Hammond E4E
Ham-Nord G0P
Hampstead E5M
Hampton E2S, E5N
Ham-Sud J0B
Hanover R0A, R5G
Hanwell E3B, E3C, E3E, E6K
Harcourt E4T
Harrison Hot Springs V0M
Harrison Park R0J
Hartland E7P
Harvey E4H, E6K
Hatley J0B, J1M
Havelock E4G, E4Z, J0S
Hawkesbury K6A
Hazelton E9C
Headingley R4H, R4J
Hemmingford J0L
Henryville J0J
Highlands V9B, V9E
Hillsborough E1J, E4H
Hinchinbrooke J0S
Homalco 9 V9H
Hope V0X
Hopewell E4H
Horton K7V
Howick J0S
Huberdeau J0T
Hudson J0P
Huntingdon J0S
Huskisson E4T
Indian Brook 14 B0N
Indian Island 28 E4W
Ingersoll N5C
Innisfil L0L, L9S
Inverness, Subd. A B0E
Inverness, Subd. B B0E
Inverness, Subd. C B0E, B9A
Johnston E4C
Joliette J6E
Juan de Fuca (Part 1) V9E, V9Z
Juan de Fuca (Part 2) V0S, V9Z
Kahnawake J0L
Kamloops V1S, V2B, V2C, V2E, V2H
Kamloops 1 V2H
Kars E5T
Katzie 1 V3Y
Kawartha Lakes L0A, K0M, K9V
Kazabazua J0X
Kelowna V1P, V1V, V1W, V1X, V4V
Kenora P0X, P9N
Kenora 38B P9N
Kenora, Unorganized P0X, P9N
Kent V0M, E7J, E7L
Kentville B4N
Keremeos V0X
Killarney - Turtle Mountain R0K
Kimberley V1A
Kincardine N0G, N2Z
King L0G, L3Y, L7B, L7E, L9N
Kings, Subd. A B0P, B4N, B4R
Kings, Subd. B B0P, B4N
Kings, Subd. C B4N, B4P, B4R
Kings, Subd. D B0P, B4P
Kingsbury J0B
Kingsclear E3C, E3E, E6K
Kingsclear 6 E3E
Kingsey Falls J0A
Kingston E2E, E5N, E5S, K0H, K7K, K7L, K7M, L7P 
Kingsville N0P, N0R, N8H, N8M, N9Y
Kirkland H9H, H9J
Kootenay Boundary A V1R
Kootenay Boundary B / Lower Columbia-Old-Glory V0G, V1R
Kootenay Boundary C / Christina Lake V0H
Kootenay Boundary D / Rural Grand Forks V0H
Kootenay Boundary E / West Boundary V0H
Kwawkwawapilt 6 V2P
La Broquerie R0A
La Pêche J0X
La Prairie J5R
La Présentation J0H
La Visitation-de-l'Île-Dupas J0K
La Visitation-de-Yamaska J0G
Lac-Brome J0E
Lac-des-Seize-Îles J0T
Lachute J8H
Lac-Nilgaut J0X
Lacolle J0J
Lac-Pythonga J0X
Lac-Sainte-Marie J0X
Ladysmith V9G
Lake Country V4V
Lake Cowichan V0R
Lake of the Woods P0W
Lakeshore N8M, N8N, N9K, R0L, R7N
Lambton Shores N0M, N0N
Lanark Highlands K0A, K0G
L'Ange-Gardien J8L
Langford V9B, V9C
Langley V0X, V1M, V2Y, V2Z, V3A, V4W
Lanoraie J0K
Lantzville V0R
LaSalle N9A, N9H, N9J
L'Assomption J5W
Laval H7A, H7B, H7C, H7E, H7G, H7H, H7J, H7K, H7L, H7M, H7N, H7P, H7R, H7S, H7T, H7V, H7W, H7X, H7Y
Lavaltrie J5T
L'Avenir J0C
Lawrenceville J0E
Leamington N8H
Leclercville G0S
Leeds and the Thousand Islands K0E, K7G
Lefebvre J0H
Lemieux G0X
L'Épiphanie J5X
Lepreau E5J
Léry J6N
Les Cèdres J7T
Les Coteaux J7X
L'Île-Cadieux J7V
L'Île-Dorval H9S
L'Île-du-Grand-Calumet J0X
L'Île-Perrot J7V
Lillooet V0K
Lincoln E3B, L0R, L2R
Lions Bay V0N
L'Isle-aux-Allumettes J0X
Litchfield J0X
Lochaber J0X
Lochaber-Partie-Ouest J0X
Lockeport B0T
London N5V, N5W, N5X, N5Y, N5Z, N6A, N6B, N6C, N6E, N6G, N6H, N6J, N6K, N6L, N6M, N6N, N6P
Long Plain (Part) 6 R0H
Longueuil J3Y, J3Z, J4G, J4H, J4J, J4K, J4L, J4M, J4N, J4P, J4R, J4T, J4V
Lorne R0G, R0K
Lorraine J6Z
Louise R0G, R0K
Louiseville J5V
Low J0X
Loyalist K0H, K7N
Lumby V0E
Lunenburg B0J, B0R, B4V
Lytton V0K
Macdonald R0G, R4G
Maddington Falls G0Z
Magog J1X
Malahide N5H
Manners Sutton E6K
Manseau G0X
Mansfield-et-Pontefract J0X
Maple Ridge V2W, V2X, V4R
Marieville J3M
Markham L3P, L3R, L3S, L3T, L6B, L6C, L6E, L6G
Marktosis 15 V0R
Maskinongé J0K
Massueville J0G
Matsqui Main 2 V4X
Maugerville E3A
McAdam E6J
McCreary R0J
McMasterville J3G
McNab/Braeside K0A, K7S
Meductic E6H
Melbourne J0B
Membertou 28B B1M, B1P, B1S
Memramcook E4K
Mercier J6R
Merrickville-Wolford K0G
Merritt V1K
Metchosin V8X, V9C
Middlesex Centre N0L, N0M, N5X, N6H, N6P
Midland L4R
Midway V0H
Millbrook 27 B2N, B6L
Mille-Isles J0R
Millville E6E
Milton L0P, L9E, L9T
Minden Hills K0M
Minnedosa R0J
Minto E4B
Minto-Odanah R0J
Mirabel J7N
Mission V2V, V4S
Mission 1 V7J
Mississauga L4T, L4V, L4W, L4X, L4Y, L4Z, L5A, L5B, L5C, L5E, L5G, L5H, L5J, L5K, L5L, L5M, L5N, L5P, L5R, L5S, L5T, L5V, L5W, M7R
Mississippi Mills K0A, K7C
Moncton E1A, E1C, E1E, E1G, E1H, E4P, E4T, E4V
Mono L9R
Montague K7A
Montcalm J0T
Montebello J0V
Montpellier J0V
Montréal  H1A, H1B, H1C, H1E, H1G, H1H, H1J, H1K, H1L, H1M, H1N, H1P, H1R, H1S, H1T, H1V, H1W, H1X, H1Y, H1Z, H2A, H2B, H2C, H2E, H2G, H2H, H2J, H2K, H2L, H2M, H2N, H2P, H2R, H2S, H2T, H2V, H2W, H2X, H2Y, H2Z, H3A, H3B, H3C, H3E, H3G, H3H, H3J, H3K, H3L, H3M, H3N, H3P, H3R, H3S, H3T, H3V, H3W, H3X, H3Y, H3Z, H4A, H4B, H4C, H4E, H4G, H4H, H4J, H4K, H4L, H4M, H4N, H4P, H4R, H4S, H4T, H4V, H4W, H4X, H4Y, H4Z, H5A, H5B, H8N, H8P, H8R, H8S, H8T, H8Y, H8Z, H9A, H9C, H9E, H9H, H9J, H9K, H9P
Montréal-Est H1B
Montréal-Ouest H4X
Mont-Royal H3P
Mont-Saint-Grégoire J0J
Mont-Saint-Hilaire J3G, J3H
Morden R6M
Morin-Heights J0R
Mount Waddington A V0P
Mount Waddington C V0N
Mount Waddington D V0N
Mountain (North) R0L
Mulgrave-et-Derry J8L
Musquash E5J
Musqueam 2 V6N
Nackawic E6G
Nakusp V0G
Namur J0V
Nanaimo V9R, V9S, V9T, V9V, V9X
Nanaimo A V0R, V9G, V9R, V9X
Nanaimo B V0R, V9R
Nanaimo C V9R, V9S, V9T, V9X
Nanaimo E V9P
Nanaimo F V0R, V9K, V9P
Nanaimo G V9K, V9P
Nanaimo H V0R, V9K
Nanaimo River V9X
Nanaimo Town 1 V9R
Napierville J0J
Neepawa R0J
Neskonlith V0E
New Credit (Part) 40A N0A
New Glasgow B2H
New Maryland E3B, E3C
New Songhees 1A V9A
New Tecumseth L0G, L9R
New Westminster V3L, V3M
Newmarket L3X, L3Y
Newport J0B
Niagara Falls L2E, L2G, L2H, L2J
Niagara-on-the-Lake L0S, L2R
Nicola Mameet 1 V0K, V1K
Nicolet J3T
Niverville R0A
Nooaitch 10 V1K
Norfolk County N0A, N0E, N0J, N3Y, N4B, N4G
Norfolk-Treherne R0G
North Bay 5 V0E
North Cowichan V0R, V9L
North Dundas K0A, K0C, K0E
North Glengarry K0B, K0C
North Grenville K0G
North Hatley J0B
North Kawartha K0L
North Lake E6H, E7N
North Norfolk R0H
North Okanagan B V1B, V1H
North Okanagan C V1B
North Okanagan D V0E, V1B
North Okanagan E V0E
North Okanagan F V0E, V1E
North Saanich V8L
North Stormont K0A, K0C
North Vancouver V7G, V7H, V7J, V7K, V7L, V7M, V7N, V7P, V7R
Northampton E7N
Northfield E4A, E4B
Norton E4E, E5N, E5T
Norwich N0J, N4G, N4S
Notre-Dame-de-Bonsecours J0V
Notre-Dame-de-Ham G0P
Notre-Dame-de-la-Paix J0V
Notre-Dame-de-la-Salette J0X
Notre-Dame-de-l'Île-Perrot J7V
Notre-Dame-de-Lourdes J0K
Notre-Dame-des-Prairies J6E
Notre-Dame-de-Stanbridge J0J
Notre-Dame-du-Bon-Conseil J0C
Notre-Dame-du-Laus J0X
Notre-Dame-du-Mont-Carmel G0X
Noyan J0J
Oak Bay V8P, V8R, V8S
Oakville L6H, L6J, L6K, L6L, L6M
Odanak J0G
Ogden J0B
Oka J0N
Okanagan (Part) 1 V1H
Okanagan-Similkameen A V0H
Okanagan-Similkameen B V0X
Okanagan-Similkameen C V0H
Okanagan-Similkameen D V0H, V2A
Okanagan-Similkameen E V0H, V2A
Okanagan-Similkameen F V2A
Okanagan-Similkameen G V0X
Oliver Paipoonge P0T, P7B, P7C, P7G, P7J, P7K
Orford J1X
Orillia L3V
Ormstowm J0S
Oro-Medonte L0K, L0L, L3V, L4M, L4R
Oromocto E2V
Oromocto 26 E2V
Oshawa L1G, L1H, L1J, L1K, L1L 
Osoyoos V0H
Otonabee-South Monaghan K9J
Ottawa K0A, K1A, K1B, K1C, K1E, K1G, K1H, K1J, K1K, K1L, K1M, K1N, K1P, K1R, K1S, K1T, K1V, K1W, K1X, K1Y, K1Z, K2A, K2B, K2C, K2E, K2G, K2H, K2J, K2K, K2L, K2M, K2P, K2R, K2S, K2T, K2V, K2W, K4A, K4B, K4C, K4M, K4P
Otter Lake J0X
Otterburn Park J3H
Oyster Bay 12 V9G
Papineauville J0V
Parksville V9P
Peachland V0H
Peel E7L
Peelee N0R
Pelham L0S, L3C
Pemberton V0N
Pembina R0G
Penelakut Island 7 V0R
Penetanguishene L9M
Pennfield E5C, E5H, E5J
Penticton V2A
Penticton 1 V2A
Perth K7H
Perth-Andover E7H
Petersville E5K, E5L
Petitcodiac E4Z
Pickering L0H, L1V, L1W, L1X, L1Y
Pictou, Subd. A B0K
Pictou, Subd. B B0K, B2H
Pictou, Subd. C B0K, B2H
Pierreville J0G
Pike River J0J
Pinawa R0E
Pincourt J7W
Piney R0A
Pitt Meadows V3Y
Plaisance J0V
Plaster Rock E7G
Pointe-Calumet J0N
Pointe-Claire H4Y, H9P, H9R, H9S
Pointe-des-Cascades J0P
Pointe-Fortune J0P
Pontiac J0X
Port Alberni V9Y
Port Colborne L0S, L3K
Port Coquitlam V3B, V3C, V3E
Port Elgin E4M
Port Hawkesbury B9A
Port Hope L0A, L1A
Port Moody V3H
Portage la Prairie R0H, R1N
Portage-du-Fort J0X
Potton J0E
Powell River V8A
Powell River A V0N, V8A
Powell River B V8A
Powell River C V8A
Powell River D V0N
Powell River E V0R
Prairie Lakes R0K
Prairie View R0J, R0M
Prévost J0R
Prince Edward County K0K, K8N
Prince William E6K
Princeton V0X
Princeville G6L
Puslinch N0B, N1H
Quaaout 1 V0E
Qualicum V9K
Qualicum Beach V9K
Quatsino Subdivision 18 V0N
Queens B0J, B0T, B4V
Queensbury E6E, E6G, E6L
Quinsam 12 V9H
Quinte West K0K, K8N, K8R, K8V
Quispamsis E2E, E2G, E2S
Racine J0E
Rainy River P0W
Rainy River, Unorganized P9A
Renfrew K7V
Repentigny J5Z
Rexton E4W
Rhineland R0G
Richelieu J3L
Richibucto E4S, E4W
Richibucto 15 E4T, E4W
Richmond V6V, V6W, V6X, V6Y, V7A, V7B, V7C, V7E, E7M, E7N
Richmond Hill L3T, L4B, L4C, L4E, L4G, L4S
Richmond, Subd. A B0E, B9A
Richmond, Subd. B B0E, B2E, B2J
Richmond, Subd. C B0E
Rideau Lakes K0E, K0G, K7A
Rigaud J0P
Ripon J0V
Ritchot R0A, R2N, R5A
Riverside-Albert E4H
Riverview E1B
Rivière-Beaudette J0P
Rockwood R0C
Rosemère J7A
Rossland V0G
Rothesay E2E, E2H, E2S
Rougemont J0L
Roxton Falls J0H
Roxton Pond J0E
Russell K4R
Russell-Binscarth R0J
Saanich V8N, V8P, V8R, V8W, V8X, V8Y, V8Z, V9A, V9E
Sackville E4K, E4L
Saint Andrews E5B
Saint Croix E3L, E5B
Saint David E3L, E5A
Saint George E5C
Saint James E3L, E5A
Saint John E2E, E2H, E2J, E2K, E2L, E2M, E2N, E2P, E2R, E2S
Saint Martins E5N, E5R
Saint Mary E1G, E4S, E4T, E4V, E4W
Saint Marys E3A, E6C
Saint Patrick E5A, E5B, E5C
Saint Stephen E3L
Saint-Adolphe-d'Howard J0T
Saint-Adrien J0A
Saint-Aimé J0G
Saint-Albert J0A
Saint-Alexandre J0J
Saint-Alexis J0K
Saint-Alphonse-de-Granby J0E
Saint-Amable J0L
Saint-André-Avellin J0V
Saint-André-d'Argenteuil J0V
Saint-Anicet J0S
Saint-Antoine E4V
Saint-Antoine-sur-Richelieu J0L
Saint-Armand J0J
Saint-Barnabé G0X
Saint-Barnabé-Sud J0H
Saint-Barthélemy J0K
Saint-Basile-le-Grand J3N
Saint-Benoît-du-Lac J0B
Saint-Bernard-de-Lacolle J0J
Saint-Bernard-de-Michaudville J0H
Saint-Blaise-sur-Richelieu J0J
Saint-Bonaventure J0C
Saint-Bruno-de-Montarville J3V
Saint-Calixte J0K
Saint-Camille J0A
Saint-Célestin J0C
Saint-Césaire J0L
Saint-Charles E4T, E4W, E4X
Saint-Charles-sur-Richelieu J0H
Saint-Christophe-d'Arthabaska G6S
Saint-Chrysostome J0S
Saint-Claude J1S
Saint-Clet J0P
Saint-Colomban J5K
Saint-Constant J5A
Saint-Cuthbert J0K
Saint-Cyprien-de-Napierville J0J
Saint-Cyrille-de-Wendover J1Z
Saint-Damase J0H
Saint-Denis-de-Brompton J0B
Saint-Denis-sur-Richelieu J0H
Saint-Dominique J0H
Sainte-Angèle-de-Monnoir J0L
Sainte-Anne-de-Bellevue H9X
Sainte-Anne-de-la-Pérade G0X
Sainte-Anne-de-la-Rochelle J0E
Sainte-Anne-de-Sabrevois J0J
Sainte-Anne-de-Sorel J3P
Sainte-Anne-des-Plaines J0N
Sainte-Barbe J0S
Sainte-Brigide-d'Iberville J0J
Sainte-Brigitte-des-Saults J0C
Sainte-Catherine J5C
Sainte-Catherine-de-Hatley J0B
Sainte-Cécile-de-Lévrard G0X
Sainte-Cécile-de-Milton J0E
Sainte-Christine J0H
Sainte-Clotilde J0L
Sainte-Clotilde-de-Horton J0A
Saint-Edmond-de-Grantham J0C
Saint-Édouard J0L
Sainte-Edwidge-de-Clifton J0B
Sainte-Élisabeth J0K
Sainte-Élizabeth-de-Warwick J0A
Sainte-Eulalie G0Z
Sainte-Françoise G0S
Sainte-Geneviève-de-Batiscan G0X
Sainte-Geneviève-de-Berthier J0K
Sainte-Hélène-de-Bagot J0H
Sainte-Julie J3E
Sainte-Julienne J0K
Sainte-Justine-de-Newton J0P
Saint-Elphège J0G
Sainte-Madeleine J0H
Sainte-Marie-de-Blandford G0X
Sainte-Marie-Madeleine J0H
Sainte-Marie-Salomé J0K
Sainte-Marthe J0P
Sainte-Marthe-sur-le-Lac J0N
Saint-Émile-de-Suffolk J0V
Sainte-Monique J0G
Sainte-Perpétue J0C
Sainte-Sabine J0J
Sainte-Séraphine J0A
Sainte-Sophie J5J
Sainte-Sophie-de-Lévrard G0X
Saint-Esprit J0K
Sainte-Thérèse J7E
Saint-Étienne-de-Beauharnois J0S
Saint-Étienne-de-Bolton J0E
Saint-Étienne-des-Grès G0X
Saint-Eugène J0C
Saint-Eustache J7R
Sainte-Victoire-de-Sorel J0G
Saint-Félix-de-Kingsey J0B
Saint-François-du-Lac J0G
Saint-François-Xavier-de-Brompton J0B
Saint-Georges-de-Clarenceville J0J
Saint-Georges-de-Windsor J0A
Saint-Gérard-Majella J0G
Saint-Germain-de-Grantham J0C
Saint-Guillaume J0C
Saint-Herménégilde J0B
Saint-Hippolyte J8A
Saint-Hugues J0H
Saint-Hyacinthe J2R, J2S, J2T
Saint-Ignace-de-Loyola J0K
Saint-Ignace-de-Stanbridge J0J
Saint-Isidore J0L
Saint-Isidore-de-Clifton J0B
Saint-Jacques J0K
Saint-Jacques-le-Mineur J0J
Saint-Jean-Baptiste J0L
Saint-Jean-sur-Richelieu J0J, J2W, J2X, J2Y, J3A, J3B
Saint-Joachim-de-Shefford J0E
Saint-Joseph-de-Sorel J3R
Saint-Joseph-du-Lac J0N
Saint-Jude J0H
Saint-Justin J0K
Saint-Lambert J4P
Saint-Lazare J7T
Saint-Léonard-d'Aston J0C
Saint-Liboire J0H
Saint-Louis E4X
Saint-Louis de Kent E4W, E4X
Saint-Louis-de-Blandford G0Z
Saint-Louis-de-Gonzague J0S
Saint-Luc-de-Vincennes G0X
Saint-Lucien J0C
Saint-Majorique-de-Grantham J2B, J2E
Saint-Malo J0B
Saint-Marcel-de-Richelieu J0H
Saint-Marc-sur-Richelieu J0L
Saint-Mathias-sur-Richelieu J3L
Saint-Mathieu J0L
Saint-Mathieu-de-Beloeil J3G
Saint-Maurice G0X
Saint-Michel J0L
Saint-Narcisse G0X
Saint-Nazaire-d'Acton J0H
Saint-Norbert J0K
Saint-Ours J0G
Saint-Patrice-de-Sherrington J0L
Saint-Paul E4T
Saint-Paul-d'Abbotsford J0E
Saint-Paul-de-l'Île-aux-Noix J0J
Saint-Philippe J0L
Saint-Pie J0H
Saint-Pie-de-Guire J0G
Saint-Pierre-les-Becquets G0X
Saint-Placide J0V
Saint-Polycarpe J0P
Saint-Prosper-de-Champlain G0X
Saint-Rémi J0L
Saint-Rémi-de-Tingwick J0A
Saint-Robert J0G
Saint-Roch-de-l'Achigan J0K
Saint-Roch-de-Richelieu J0L
Saint-Roch-Ouest J0K
Saint-Rosaire G0Z
Saint-Samuel G0Z
Saint-Sébastien J0J
Saint-Simon J0H
Saint-Sixte J0X
Saint-Stanislas G0X
Saint-Stanislas-de-Kostka J0S
Saint-Sulpice J5W
Saint-Sylvère G0Z
Saint-Télesphore J0P
Saint-Théodore-d'Acton J0H
Saint-Thomas J0K
Saint-Urbain-Premier J0S
Saint-Valentin J0J
Saint-Valère G0P
Saint-Valérien-de-Milton J0H
Saint-Wenceslas G0Z
Saint-Zéphirin-de-Courval J0G
Saint-Zotique J0P
Salaberry-de-Valleyfield J6S, J6T
Salisbury E1G, E4E, E4J, E4Z
Salmon Arm V0E, V1E
Saltspring Island V8K
Saugeen Shores N0H
Scugog L9L
Sechelt V0N
Sechelt (Part) V0N, V8A
Selkirk R1A
Semiahmoo V3Z
Senneville H9X
Severn L0K, L3V
Seymour Creek 2 V7J, V7L
Shackan 11 V1K
Shawville J0X
Shediac E1H, E4P, E4R
Sheffield E3A, E4B
Shefford J2M
Shelburne B0T, B0W
Sherbrooke J1C, J1E, J1G, J1H, J1J, J1K, J1L, J1M, J1N, J1R
Shoal Lake (Part) 39A P0X
Shuniah P7A
Sicamous V0E
Sidney V8L
Simonds E2J, E2S, E5N, E5R, E7K, E7L, E7P
Six Nations (Part) 40 N0E
Skowkale V2R, V4Z
Skway 5 V2R
Sliammon 1 V8A
Smiths Falls K7A
Sooke V9Z
Soowahlie 14 V2R
Sorel-Tracy J3P, J3R
Souris-Glenwood R0K
South Bruce Peninsula N0H
South Dundas K0C, K0E
South Frontenac K0H
South Glengarry K0C, K6H
South Huron N0M
South Saanich 1 V8M
South Stormont K0C, K6H, K6K
Southampton E6E, E6G, E7N
Southern Gulf Islands V0N, V8L
South-West Oxford N0L, N4G, N0J, N4S, N5C
Southwold N5P
Spallumcheen V0E, V1B, V1H
Springfield E4C, E5N, E5P, E5T, R0E, R2C, R2E, R2J, R3X, R5L, R5M, R5N, R5P, R5R, R5T
Springwater L0L, L4M, L9X
Squamish V0N, V8B
Squamish-Lillooet C V0N
Squamish-Lillooet D V0N
Squiaala V2P
St. Andrews R0C, R1A
St. Catharines L2M, L2N, L2P, L2R, L2S, L2T, L2W
St. Clements R0E, R1A, R1B, R1C, R2E
St. George E5C
St. Martins E5R
St. Mary's B0H, B0J
St. Stephen E3L
St. François Xavier R4L
Stanbridge East J0J
Stanbridge Station J0J
Stanley E6B, E6C, R0G, R6M, R6W
Stanstead J0B, J1X
Stanstead-Est J0B
Ste. Anne R0A, R0E, R5G, R5H
Stellarton B0K, B2H
Stirling-Rawdon K0K
Stone Mills K0K
St-Pierre-Jolys R0A
Strathcona A V0P, V9H, V9W
Strathcona B V0P
Strathcona C V0P
Strathcona D (Oyster Bay - Buttle Lake) V9H, V9W
Strathroy-Caradoc N0L, N7G
Stuartburn R0A
Studholm E4G, E5P
Stukely-Sud J0E
Summerland V0H
Sunshine Coast A V0N
Sunshine Coast B V0N
Sunshine Coast D V0N
Sunshine Coast E V0N
Sunshine Coast F V0N
Surrey V3R, V3S, V3T, V3V, V3W, V3X, V3Z, V4A, V4N, V4P 
Sussex E4E, E4G, E5P, E5T
Sussex Corner E4E, E4G
Sutton J0E
Switsemalph V1E
Switsemalph 3 V1E
Taché R0A, R0G, R5H, R5J, R5K
Tay L0K, L4R
Tay Valley K7H
Tecumseh N0R, N8N, N8P, N8T, N9A, N9K
Terrasse-Vaudreuil J7V
Terrebonne J5M, J6V, J6W, J6X, J6Y, J7M
Thames Centre N0L, N0M, N5V, N6M
Thamesville N0P
The Blue Mountains L9Y
The Nation / La Nation K0A
Thompson R0G
Thompson-Nicola I (Blue Sky Country) V0K
Thompson-Nicola J (Copper Desert Country) V0K, V1S
Thompson-Nicola L (Grasslands) V0E, V2C
Thompson-Nicola M (Beautiful Nicola Valley - North) V1K
Thompson-Nicola N (Beautiful Nicola Valley - South) V1K
Thompson-Nicola O (Lower North Thompson) V0E
Thompson-Nicola P (Rivers and the Peaks) V0E, V2B, V2C, V2H
Thorold L0S, L2V, L3B
Thunder Bay P7A, P7B, P7C, P7E, P7G, P7J, P7K
Thunder Bay, Unorganized P7B, P7G
Tilley E7H
Tillsonburg N4G
Tingwick J0A
Tiny L0K, L0L, L9M
Tobique First Nation E7H
Tofino V0R
Toronto M1B, M1C, M1E, M1G, M1H, M1J, M1K, M1L, M1M, M1N, M1P, M1R, M1S, M1T, M1V, M1W, M1X, M2H, M2J, M2K, M2L, M2M, M2N, M2P, M2R, M3A, M3B, M3C, M3H, M3J, M3K, M3L, M3M, M3N, M4A, M4B, M4C, M4E, M4G, M4H, M4J, M4K, M4L, M4M, M4N, M4P, M4R, M4S, M4T, M4V, M4W, M4X, M4Y, M5A, M5B, M5C, M5E, M5G, M5H, M5J, M5K, M5L, M5M, M5N, M5P, M5R, M5S, M5T, M5V, M5W, M5X, M6A, M6B, M6C, M6E, M6G, M6H, M6J, M6K, M6L, M6M, M6N, M6P, M6R, M6S, M7A, M7Y, M8V, M8W, M8X, M8Y, M8Z, M9A, M9B, M9C, M9L, M9M, M9N, M9P, M9R, M9V, M9W
Tracy E5L
Trail V1R
Trent Hills K0K, K0L
Trenton B0K
Très-Saint-Rédempteur J0P
Très-Saint-Sacrement J0S
Truro B2N
Tsahaheh 1 V9Y
Tsawwassen V4L, V4M
Tsinstikeptum  9 V1Z, V4T
Tsinstikeptum 10 V1Z
T'Sou-ke V9Z
Tweed K0K
Tyendinaga K0K
Tzeachten 13 V2R
Ucluelet V0R
Ulverton J0B
Union Bay 4 V8L
Upham E4E, E5N
Upper Miramichi E6A, E6C
Upper Sumas 6 V3G
Upton J0H
Uxbridge L0C, L0E, L4A, L9P 
Val-des-Bois J0X
Val-des-Monts J8N
Val-des-Sources J1T
Val-Joli J1S
Vancouver V5K, V5L, V5M, V5N, V5P, V5R, V5S, V5T, V5V, V5W, V5X, V5Y, V5Z, V6A, V6B, V6C, V6E, V6G, V6H, V6J, V6K, V6L, V6M, V6N, V6P, V6R, V6S, V6T, V6Z, V7X, V7Y
Varennes J3X
Vaudreuil-Dorion J7T, J7V
Vaudreuil-sur-le-Lac J7V
Vaughan L0J, L3L, L3T, L4H, L4J, L4K, L4L, L6A
Venise-en-Québec J0J
Verchères J0L
Vernon V1B, V1H, V1T
Victoria V8P, V8R, V8S, V8T, V8V, V8W, V8X, V8Z, V9A, V9B, V9C
Victoria, Subd. A B0C
Victoria, Subd. B B0E, B1X, B1Y, B2C
Victoriaville G6S
View Royal V8Z, V9A, V9B, V9C
Villeroy G0S
Wagmatcook 1 B0E
Wainfleet L0R, L0S, N0A
Wakefield E7M, E7P
Waltham J0X
Warfield V1R
Warwick J0A
Wasaga Beach L9Z
Waterborough E4A, E4C
Waterford E4E, E4H
Waterloo J0E
Waterville J0B
Weldford E4S, E4T, E4W, E4Y
Welland L3B, L3C
Wellington E4R, E4S, E4V
Wentworth J8H
Wentworth-Nord J0T
West Grey N0G
West Hants B0N, B0P
West Isles E5V
West Kelowna V1Z, V4T
West Lincoln L0R
West St. Paul R2V, R4A
West Vancouver V7P, V7S, V7T, V7V, V7W
Westbury J0B
Westfield E5K, E5S
Westmorland E4L, E4M
Westmount H3Z
Westville B0K
Whispering Pines 4 V2B
Whitby L0B, L1M, L1N, L1P, L1R
Whitchurch-Stouffville L0H, L4A
White Rock V4A, V4B
Whitehead R7A
Whitewater Region K0J, K7V
Wickham E4C, E5T, J0C
Wicklow E7H, E7K, E7L
Wilmot E7K
Windsor B0N, N0R, N8N, N8P, N8R, N8S, N8T, N8V, N8W, N8X, N8Y, N9A, N9B, N9C, N9E, N9G, N9H, N9J
Winkler R6W
Winnipeg R2C, R2E, R2G, R2H, R2J, R2K, R2L, R2M, R2N, R2P, R2R, R2V, R2W, R2X, R2Y, R3A, R3B, R3C, R3E, R3G, R3H, R3J, R3K, R3L, R3M, R3N, R3P, R3R, R3S, R3T, R3V, R3W, R3X, R3Y, R4A
Winnipeg Beach R0C
Wolfville B4P
Wôlinak G0X
Woodstock E7H, E7M, E7N, N4S, N4T, N4V
Woodstock 23 E7M
Yamachiche G0X
Yamaska J0G
Yarmouth B0W, B5A
Zorra N0M, N4S, N5C

Lyme disease risk areas map

The map in figure 1 displays areas where people are most at risk of Lyme disease.

Figure 1. Cross-section map of 5 areas known for risk to tick exposure, 2024
Figure 1. Text version below.
Figure 1: Text description

This figure contains 5 cross-sections which display locations where the risk:

  • from tick bites is known to occur
  • for Lyme disease is possible

Hatched areas are locations where tick risk is known and are called risk areas.

Cross-section 1: Manitoba and Western Ontario

Risk areas can be found:

  • on the western Ontario border, and
  • across Manitoba, wherever there is suitable tick habitat below the 53rd parallel.

Cross-section 2: Southern Ontario

Risk areas can be found along the north shores of Lake Erie and Lake Ontario, and on the south shore of Lake Huron.

Cross-section 3: Southeastern Ontario and Southern Quebec

Risk areas can be found around Kingston in the Saint Lawrence valley that extend northeast towards Ottawa, locations covering:

  • Montérégie, Montréal, Laval, and large parts of Estrie and Mauricie et Centre du Québec
  • parts of Outaouais, Lanaudiére and Laurentides

Cross-section 4: Maritime provinces

In New Brunswick, risk areas can be found in the counties of:

  • York
  • Charlotte
  • Sunbury
  • Queens
  • Saint John
  • Kings
  • Albert
  • Westmorland
  • Kent
  • Carleton
  • Northumberland
  • Victoria

All of Nova Scotia is found to be a risk area.

Cross-section 5: Southern British Columbia

Risk areas can be found in:

  • much of Vancouver Island and the coast of British Columbia facing Vancouver Island
  • river valleys across southern British Columbia

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