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There are currently 445 municipalities in Ontario.
These municipalities are divided into different structural tiers. A "local municipality" may be called a city, a town, a township, a municipality or a village and can also be referred to as a "lower tier" municipality. Local or lower tier municipalities are also part of a higher level of municipal or "upper tier" government such as a county, region or district. A county or regional government is a federation of the local municipalities within its boundaries. An example of an "upper tier" municipality is the Region of Waterloo, which is composed of 7 local municipalities.
A "single tier" municipality is a municipality where there is only one level of municipal government. There are three general types of single-tier municipalities in Ontario. The first are the amalgamated municipalities, which are generally counties or regional municipalities (or parts thereof) which have been amagamated into a single administrative unit. Those are similar to a consolidated city-county in the United States. Examples of this type of single tier municipality are Toronto and Kawartha Lakes. The second type consists of a municipality which has been "carved out" of the surrounding county's jurisdiction. Examples of this type are Peterborough and Windsor. The final type of single tier municipality is one which was never traditionally part of a dual tier system of government, namely the municipalities of northern Ontario. These municipalities are found in districts, however, districts are for census purposes only. Examples of this type are North Bay and Timmins.

Contents

Single tier municipalities

By amalgamation of municipalities

By separation from the surrounding municipality

Found within districts

Dual tier municipalities

Regional municipalities

Counties

Single tier municipalities

By amalgamation of municipalities

★ Brant County (seat in Burford)

★ Chatham-Kent, formerly Kent County (seat in Chatham)

★ Greater Sudbury, formerly the Regional Municipality of Sudbury

★ Haldimand County, formerly half of the Regional Municipality of Haldimand-Norfolk (seat in Cayuga)

★ Hamilton, formerly the Hamilton-Wentworth Regional Municipality

★ Kawartha Lakes, formerly Victoria County (seat in Lindsay)

★ Norfolk County, formerly half of the Regional Municipality of Haldimand-Norfolk (seat in Simcoe)

★ Ottawa, formerly the Regional Municipality of Ottawa-Carleton

★ Prince Edward County (seat in Picton)

★ Toronto, formerly Metropolitan Toronto

By separation from the surrounding municipality

★ Barrie - Simcoe County

★ Belleville - Hastings County

★ Brantford - Brant County

★ Brockville - Leeds & Grenville County

★ Gananoque - Leeds & Grenville County

★ Guelph - Wellington County

★ Kingston - Frontenac County

★ London - Middlesex County

★ Orillia - Simcoe County

★ Pembroke - Renfrew County

★ Peterborough - Peterborough County

★ Prescott - Leeds & Grenville County

★ Quinte West - Hastings County

★ Smiths Falls - Lanark County

★ St. Marys - Perth County

★ St. Thomas - Elgin County

★ Stratford - Perth County

★ Windsor - Essex County

Found within districts

Algoma District (Sault Ste. Marie) ★ Blind River ★ Bruce Mines ★ Dubreuilville ★ Elliot Lake ★ Hilton Beach ★ Hilton ★ Hornepayne ★ Huron Shores ★ Jocelyn ★ Johnson ★ Laird ★ Macdonald, Meredith and Aberdeen Additional ★ Michipicoten ★ Plummer Additional ★ Prince ★ Sault Ste. Marie ★ Spanish ★ St. Joseph ★ Tarbutt and Tarbutt Additional ★ The North Shore ★ Thessalon ★ White River Cochrane District (Cochrane) ★ Black River-Matheson ★ Cochrane ★ Fauquier-Strickland ★ Hearst ★ Iroquois Falls ★ Kapuskasing ★ Mattice-Val Côté ★ Moonbeam ★ Moosonee ★ Opasatika ★ Smooth Rock Falls ★ Timmins ★ Val Rita-Harty Kenora District (Kenora) ★ Dryden ★ Ear Falls ★ Ignace ★ Kenora ★ Machin ★ Pickle Lake ★ Red Lake ★ Sioux Lookout ★ Sioux Narrows-Nestor Falls

Manitoulin District (Gore Bay) ★ Assiginack ★ Barrie Island ★ Billings ★ Burpee and Mills ★ Central Manitoulin ★ Cockburn Island ★ Gordon ★ Gore Bay ★ Northeastern Manitoulin and The Islands ★ Tehkummah Nipissing District (North Bay) ★ Bonfield ★ Calvin ★ Chisholm ★ East Ferris ★ Mattawa ★ Mattawan ★ North Bay ★ Papineau-Cameron ★ South Algonquin ★ Temagami ★ West Nipissing Parry Sound District (Parry Sound) ★ Armour ★ Burk's Falls ★ Callander ★ Carling ★ Joly ★ Kearney ★ Machar ★ Magnetawan ★ McDougall ★ McKellar ★ McMurrich/Monteith ★ Nipissing ★ Parry Sound ★ Perry ★ Powassan ★ Ryerson ★ Seguin ★ South River ★ Strong ★ Sundridge ★ The Archipelago ★ Whitestone Rainy River District (Fort Frances) ★ Alberton ★ Atikokan ★ Chapple ★ Dawson ★ Emo ★ Fort Frances ★ La Vallee ★ Lake of the Woods ★ Morley ★ Rainy River

Sudbury District (Espanola) ★ Baldwin ★ Chapleau ★ Espanola ★ French River ★ Killarney ★ Markstay-Warren ★ Nairn and Hyman ★ Sables-Spanish Rivers ★ St. Charles Thunder Bay District (Thunder Bay) ★ Conmee ★ Dorion ★ Gillies ★ Greenstone ★ Manitouwadge ★ Marathon ★ Neebing ★ Nipigon ★ O'Connor ★ Oliver Paipoonge ★ Red Rock ★ Schreiber ★ Shuniah ★ Terrace Bay ★ Thunder Bay Timiskaming District (Haileybury) ★ Armstrong ★ Brethour ★ Casey ★ Chamberlain ★ Charlton and Dack ★ Cobalt ★ Coleman ★ Englehart ★ Evanturel ★ Gauthier ★ Harley ★ Harris ★ Hilliard ★ Hudson ★ James ★ Kearns ★ Kirkland Lake ★ Larder Lake ★ Latchford ★ Matachewan ★ McGarry ★ Temiskaming Shores ★ Thornloe

Dual tier municipalities

Regional municipalities

Durham (Whitby) ★ Ajax ★ Brock ★ Clarington ★ Oshawa ★ Pickering ★ Scugog ★ Uxbridge ★ Whitby Halton (Milton) ★ Burlington ★ Halton Hills ★ Milton ★ Oakville

Muskoka District (Bracebridge) ★ Bracebridge ★ Georgian Bay ★ Gravenhurst ★ Huntsville ★ Lake of Bays ★ Muskoka Lakes Niagara (Thorold) ★ Fort Erie ★ Grimsby ★ Lincoln ★ Niagara-on-the-Lake ★ Niagara Falls ★ Pelham ★ Port Colborne ★ St. Catharines ★ Thorold ★ Wainfleet ★ Welland ★ West Lincoln

Oxford County (Woodstock) ★ Blandford-Blenheim ★ East Zorra-Tavistock ★ Ingersoll ★ Norwich ★ South-West Oxford ★ Tillsonburg ★ Woodstock ★ Zorra Peel (Brampton) ★ Brampton ★ Caledon ★ Mississauga

Waterloo (Kitchener) ★ Cambridge ★ Kitchener ★ North Dumfries ★ Waterloo ★ Wellesley ★ Wilmot ★ Woolwich York (Newmarket) ★ Aurora ★ East Gwillimbury ★ Georgina ★ King ★ Markham ★ Newmarket ★ Richmond Hill ★ Vaughan ★ Whitchurch-Stouffville

Counties

Bruce County (Walkerton) ★ Arran-Elderslie ★ Brockton ★ Huron-Kinloss ★ Kincardine ★ Northern Bruce Peninsula ★ Saugeen Shores ★ South Bruce Peninsula ★ South Bruce Dufferin (Orangeville) ★ Amaranth ★ East Garafraxa ★ East Luther Grand Valley ★ Melancthon ★ Mono ★ Mulmur ★ Orangeville ★ Shelburne Elgin County (St. Thomas) ★ Aylmer ★ Bayham ★ Central Elgin ★ Dutton/Dunwich ★ Malahide ★ Southwold ★ West Elgin Essex County (Windsor) ★ Amherstburg ★ Essex ★ Kingsville ★ Lakeshore ★ LaSalle ★ Leamington ★ Pelee ★ Tecumseh Frontenac (Kingston) ★ Central Frontenac ★ Frontenac Islands ★ North Frontenac ★ South Frontenac Grey County (Owen Sound) ★ Chatsworth ★ Georgian Bluffs ★ Grey Highlands ★ Hanover ★ Meaford ★ Owen Sound ★ Southgate ★ The Blue Mountains ★ West Grey Haliburton County (Minden) ★ Algonquin Highlands ★ Dysart et al ★ Highlands East ★ Minden Hills

Hastings County (Belleville) ★ Bancroft ★ Carlow/Mayo ★ Centre Hastings ★ Deseronto ★ Faraday ★ Hastings Highlands ★ Limerick ★ Madoc ★ Marmora and Lake ★ Stirling-Rawdon ★ Tudor and Cashel ★ Tweed ★ Tyendinaga ★ Wollaston Huron County (Goderich) ★ Ashfield-Colborne-Wawanosh ★ Bluewater ★ Central Huron ★ Goderich ★ Howick ★ Huron East ★ Morris-Turnberry ★ North Huron ★ South Huron Lambton County (Sarnia) ★ Brooke-Alvinston ★ Dawn-Euphemia ★ Enniskillen ★ Lambton Shores ★ Oil Springs ★ Petrolia ★ Plympton-Wyoming ★ Point Edward ★ Sarnia ★ St. Clair ★ Warwick Lanark County (Perth) ★ Beckwith ★ Carleton Place ★ Drummond/North Elmsley ★ Lanark Highlands ★ Mississippi Mills ★ Montague ★ Perth ★ Tay Valley Leeds and Grenville United Counties (Brockville) ★ Athens ★ Augusta ★ Edwardsburgh/Cardinal ★ Elizabethtown - Kitley ★ Front of Yonge ★ Leeds & the Thousand Islands ★ Merrickville-Wolford ★ North Grenville ★ Rideau Lakes ★ Westport

Lennox and Addington County (Greater Napanee) ★ Addington Highlands ★ Greater Napanee ★ Loyalist ★ Stone Mills Middlesex County (London) ★ Adelaide-Metcalfe ★ Lucan-Biddulph ★ Middlesex Centre ★ Newbury ★ North Middlesex ★ Southwest Middlesex ★ Strathroy-Caradoc ★ Thames Centre Northumberland County (Cobourg) ★ Alnwick/Haldimand ★ Brighton ★ Cobourg ★ Cramahe ★ Hamilton ★ Port Hope ★ Trent Hills Perth County (Stratford) ★ North Perth ★ Perth East ★ Perth South ★ West Perth Peterborough County (Peterborough) ★ Asphodel-Norwood ★ Cavan-Millbrook-North Monaghan ★ Douro-Dummer ★ Galway-Cavendish-Harvey ★ Havelock-Belmont-Methuen ★ North Kawartha ★ Otonabee-South Monaghan ★ Smith-Ennismore-Lakefield Prescott and Russell United Counties (L'Orignal) ★ Alfred and Plantagenet ★ Casselman ★ Champlain ★ Clarence-Rockland ★ East Hawkesbury ★ Hawkesbury ★ Russell ★ The Nation

Renfrew County (Pembroke) ★ Admaston/Bromley ★ Arnprior ★ Bonnechere Valley ★ Brudenell, Lyndoch and Raglan ★ Deep River ★ Greater Madawaska ★ Head, Clara and Maria ★ Horton ★ Killaloe, Hagarty and Richards ★ Laurentian Hills ★ Laurentian Valley ★ Madawaska Valley ★ McNab/Braeside ★ North Algona-Wilberforce ★ Petawawa ★ Renfrew ★ Whitewater Region Simcoe County (Barrie) ★ Adjala-Tosorontio ★ Bradford West Gwillimbury ★ Clearview ★ Collingwood ★ Essa ★ Innisfil ★ Midland ★ New Tecumseth ★ Oro-Medonte ★ Penetanguishene ★ Ramara ★ Severn ★ Springwater ★ Tay ★ Tiny ★ Wasaga Beach Stormont, Dundas and Glengarry United Counties (Cornwall) ★ Cornwall ★ North Dundas ★ North Glengarry ★ North Stormont ★ South Dundas ★ South Glengarry ★ South Stormont Wellington County (Guelph) ★ Centre Wellington ★ Erin ★ Guelph/Eramosa ★ Puslinch ★ Mapleton ★ Minto ★ Wellington North