Welcome, Ontarians and visitors! If you have ever looked at an incoming call on your phone or are planning to set up a new business line in the province, you have probably noticed a growing list of three-digit area codes.

As the population has grown, Ontario’s phone network has evolved. Instead of assigning completely new geographic regions, the Canadian Numbering Administrator uses overlay codes. This means that multiple area codes can cover the exact same geographic area.

Understanding how these numbers are distributed can help you identify where a call is coming from, or choose the right code for your personal or business needs.

The Core Geographic Area Codes

To help you visualize where these codes belong, we can break them down by their respective regions in Ontario.

1. The GTA and Greater Golden Horseshoe

The Greater Toronto Area (GTA) and surrounding regions are home to the highest volume of telephone numbers in the province.

• 416 & 647: These are the classic and primary area codes for the city of Toronto.

• 289 & 365: These codes act as overlays for the outer ring of the Greater Toronto and Hamilton areas, including regions like Mississauga, Brampton, Hamilton, Oakville, Oshawa, and the Niagara Region.

Note: Because 905 was the original code for these surrounding suburbs, numbers starting with 289 and 365 are commonly assigned when additional capacity is needed.

2. Southwestern Ontario

Southwestern Ontario covers a large, productive agricultural and industrial region stretching from the outer GTA to Windsor.

• 226, 548, & 519: These codes cover southwestern communities such as Kitchener-Waterloo, London, Windsor, Guelph, Sarnia, and Owen Sound.

• 753: A relatively newer overlay code that covers specific local communities, such as Perth, Toledo, Elgin, and Maberly.

3. Eastern Ontario

Eastern Ontario is home to Canada’s capital and the beautiful St. Lawrence and Ottawa valleys.

• 613: The traditional area code for Eastern Ontario, serving Ottawa, Kingston, Belleville, and Cornwall.

• 343: The overlay code introduced to manage the growing number of phone lines in the same Eastern Ontario footprint.

4. Central and Northern Ontario

Spanning from cottage country all the way to the shores of Lake Superior and Hudson Bay.

• 705: The well-known legacy code for Central and Northeastern Ontario, serving areas such as Barrie, Sudbury, Peterborough, and North Bay.

• 249: An overlay for the 705 region, supporting areas including Sault Ste. Marie, Muskoka Lakes, and the Kawartha Lakes.

How to Decode Area Codes for Your Needs

Whether you want to establish a local presence for your business or verify where someone is calling from, decoding them is straightforward:

1. Determine the target demographic: Identify the region (e.g., Eastern, Southwestern, or GTA) you wish to target.

2. Check the overlay network: If a region is “full,” use the secondary or tertiary codes for that specific area (e.g., using 365 for a Hamilton or Mississauga business rather than waiting on old allocations).

3. Recognize mobile vs. landline: While landlines typically retain their older prefixes (like 416 or 613), newer mobile phones can be assigned to overlay codes regardless of the specific neighborhood.

Are you looking to set up a new phone line or find out more about area codes in a specific city in Ontario? See the list below:

Ontario Phone Number Codes Explained

647
– Toronto

753
– Drummond/North Elmsley: Perth
– Elizabethtown-Kitley: Toledo
– Lanark Highlands: Lanark

– Lanark Highlands: McDonalds Corners
– Perth
– Rideau Lakes: Elgin
– Rideau Lakes: Portland
– Tay Valley: Maberly

226
– Amaranth: Orangeville
– Blandford-Blenheim: Plattsville
– Brant County: Paris
– Brantford
– Brockton: Walkerton
– Caledon: Caledon
– Cambridge: Galt
– Cambridge: Hespeler
– Cambridge: Preston
– Central Huron: Clinton
– Centre Wellington: Elora
– Centre Wellington: Fergus
– Chatham-Kent: Chatham
– East Garafraxa: Orangeville
– Erin: Erin
– Erin: Hillsburgh
– Georgian Bluffs: Owen Sound
– Guelph
– Guelph/Eramosa: Rockwood
– Halton Hills: Acton
– Kitchener: Kitchener-Waterloo
– London: London
– Mapleton: Drayton
– Melancthon: Shelburne
– Mono: Orangeville
– Norfolk County: Simcoe
– North Dumfries: Ayr
– North Perth: Listowel
– Orangeville
– Owen Sound
– Point Edward: Sarnia
– Puslinch: Guelph
– Sarnia: Sarnia
– Shelburne
– Six Nations of the Grand River: Ohsweken
– South Huron: Exeter
– Stratford
– Strathroy-Caradoc: Strathroy
– Tillsonburg
– Waterloo: Kitchener-Waterloo
– Wellesley: Linwood
– Wellesley: St Clements
– Wellesley: Wellesley
– West Grey: Durham
– Wilmot: Baden
– Wilmot: New Dundee
– Wilmot: New Hamburg
– Windsor
– Woodstock
– Woolwich: Breslau
– Woolwich: Elmira
– Woolwich: St Jacobsdd

548
– Aamjiwnaang First Nation: Corunna
– Adelaide Metcalfe: Kerwood
– Amherstburg
– Arran-Elderslie: Chesley
– Arran-Elderslie: Tara
– Ashfield-Colborne-Wawanosh: Auburn
– Blandford-Blenheim: Bright
– Blandford-Blenheim: Drumbo
– Blandford-Blenheim: Princeton
– Blue Mountains: Thornbury
– Bluewater: Hensall
– Brant County: Burford
– Brant County: Mount Pleasant
– Brant County: Scotland
– Brant County: St George
– Brockton: Cargill
– Brooke-Alvinston: Alvinston
– Central Elgin: Belmont
– Central Elgin: Port Stanley
– Central Elgin: Sparta
– Chatham-Kent: Blenheim
– Chatham-Kent: Bothwell
– Chatham-Kent: Dresden
– Chatham-Kent: Highgate
– Chatham-Kent: Merlin
– Chatham-Kent: Ridgetown
– Chatham-Kent: Thamesville
– Chatham-Kent: Tilbury
– Chatham-Kent: Wallaceburg
– Chatham-Kent: Wheatley
– Chatsworth
– Chippewas Of The Thames: Melbourne
– Delaware Nation at Moraviantown: Bothwell
– Dutton/Dunwich: Dutton
– East Zorra-Tavistock: Hickson
– East Zorra-Tavistock: Innerkip
– East Zorra-Tavistock: Tavistock
– Enniskillen: Oil Springs
– Essex: Essex
– Essex: Harrow
– Essex: McGregor
– Goderich
– Grand Valley
– Grey Highlands: Feversham
– Grey Highlands: Flesherton
– Grey Highlands: Markdale
– Haldimand County: Delhi
– Haldimand County: Jarvis
– Hamilton: Lynden
– Hanover
– Huron East: Brussels
– Huron East: Seaforth
– Huron-Kinloss: Lucknow
– Ingersoll 548 324 9536
– Kingsville
– Lakeshore: Belle River
– Lakeshore: Comber
– Lakeshore: Emeryville
– Lakeshore: Pleasant Park
– Lakeshore: Stoney Point
– Lakeshore: Woodslee
– LaSalle
– Leamington
– London: Lambeth
– Lucan Biddulph: Lucan
– Meaford
– Middlesex Centre: Ilderton
– Minto: Harriston
– Minto: Palmerston
– Morris-Turnberry: Brussels
– Neyaashiinigmiing: Wiarton
– Norfolk County: Langton
– Norfolk County: Port Dover
– Norfolk County: Port Rowan
– Norfolk County: Waterford
– North Huron: Blyth
– North Huron: Wingham
– North Middlesex: Ailsa Craig
– North Middlesex: Nairn
– North Middlesex: Parkhill
– North Perth: Atwood
– North Perth: Monkton
– Norwich: Eastwood
– Norwich: Norwich
– Norwich: Otterville
– Oil Springs
– Oneida Nation Of The Thames: Melbourne
– Pelee: Pelee Island
– Perth East: Shakespeare
– Petrolia
– Plympton-Wyoming: Wyoming
– Sarnia: Bright’s Grove
– Saugeen First Nation: Southampton
– Saugeen Shores: Southampton
– South Bruce Peninsula: Hepworth
– South Bruce Peninsula: Sauble Beach
– South Bruce Peninsula: Wiarton
– South Huron: Centralia
– South Huron: Crediton
– South Middlesex: Glencoe
– South-West Oxford: Beachville
– South-West Oxford: Brownsville
– Southgate: Dundalk
– Southgate: Holstein
– Southwest Middlesex: Melbourne
– Southwest Middlesex: Wardsville
– Southwold: Fingal
– Southwold: Shedden
– St Clair: Brigden
– St Clair: Corunna
– St Clair: Courtright
– St Clair: Port Lambton
– St Clair: Sombra
– St Marys
– St Thomas
– Strathroy-Caradoc: Melbourne
– Strathroy-Caradoc: Mount Brydges
– Tecumseh: Maidstone
– Tecumseh: Tecumseh
– Thames Centre: Dorchester
– Thames Centre: Harrietsville
– Thames Centre: Thorndale
– Walpole Island First Nation: Port Lambton
– Warwick: Watford
– Wellington North: Arthur
– Wellington North: Mount Forest
– West Elgin: Rodney
– West Elgin: West Lorne
– West Perth: Dublin
– West Perth: Mitchell
– Zorra: Embro
– Zorra: Kintore

343
– Addington Highlands: Denbigh
– Addington Highlands: Northbrook
– Alfred and Plantagenet: Alfred
– Alfred and Plantagenet: Plantagenet
– Arnprior
– Belleville: Thurlow
– Casselman
– Central Frontenac: Arden
– Champlain: L’Orignal
– Champlain: Vankleek Hill
– Clarence-Rockland: Bourget
– Clarence-Rockland: Clarence Creek
– Clarence-Rockland: Rockland
– Cornwall
– Deseronto
– East Hawkesbury: St Eugene
– Frontenac Islands: Wolfe Island
– Hastings Highlands: Maynooth
– Highlands East: Cardiff
– Leeds and the Thousand Islands: Seeleys Bay
– Loyalist: Bath
– Loyalist: Odessa
– Marmora and Lake: Marmora
– McNab/Braeside: Arnprior
– Merrickville-Wolford: Merrickville
– Mississippi Mills: Almonte
– Mississippi Mills: Pakenham
– Mohawks Of The Bay Of Quinte First Nation: Deseronto
– Montague: Smiths Falls
– Napanee: Adolphustown
– Napanee: Napanee
– Napanee: Selby
– North Dundas: Chesterville
– North Dundas: South Mountain
– North Dundas: Winchester
– North Frontenac: Plevna
– North Glengarry: Alexandria
– North Glengarry: Glen Robertson
– North Glengarry: Maxville
– North Stormont: Avonmore
– North Stormont: Crysler
– North Stormont: Finch
– Ottawa: Carp
– Ottawa: Constance Bay
– Ottawa: Cumberland
– Ottawa: Gloucester
– Ottawa: Jockvale
– Ottawa: Metcalfe
– Ottawa: Navan
– Ottawa: North Gower
– Ottawa: Orleans
– Ottawa: Osgoode
– Ottawa: Richmond
– Prince Edward County: Bloomfield
– Prince Edward County: Wellington
– Quinte West: Frankford
– Quinte West: Wooler
– Russell: Embrun
– Russell: Russell
– Smiths Falls
– South Dundas: Iroquois
– South Dundas: Morrisburg
– South Dundas: Williamsburg
– South Frontenac: Harrowsmith
– South Frontenac: Inverary
– South Frontenac: Sydenham
– South Frontenac: Verona
– South Glengarry: Lancaster
– South Glengarry: Martintown
– South Stormont: Ingleside
– South Stormont: Long Sault
– Stirling-Rawdon: Stirling
– Stone Mills: Enterprise
– Stone Mills: Newburgh
– Stone Mills: Tamworth
– Stone Mills: Yarker
– The Nation: St Isidore
– Tudor and Cashel: Gilmour
– Tweed
– Tyendinaga: Deseronto
– Wollaston: Coe Hill
– Zorra: Thamesfor

289
– Ajax: Ajax-Pickering
– Aurora
– Bowmanville
– Bradford West Gwillimbury: Bradford
– Brampton: Brampton
– Burlington
– Caledon: Bolton
– Caledon: Caledon East
– Caledon: Palgrave
– Caledon: Victoria
– Clarington: Newcastle
– East Gwillimbury: Queensville
– Fort Erie: Fort Erie
– Georgina: Keswick
– Georgina: Sutton
– Halton Hills: Georgetown
– Hamilton: Ancaster
– Hamilton: Dundas
– Hamilton: Freelton
– Hamilton: Hamilton
– Hamilton: Mount Hope
– Hamilton: Stoney Creek
– Hamilton: Waterdown
– King: King City
– King: Nobleton
– King: Schomberg
– Markham: Markham
– Markham: Thornhill
– Markham: Unionville
– Milton: Campbellville
– Milton: Milton
– Mississauga: Clarkson
– Mississauga: Cooksville
– Mississauga: Malton
– Mississauga: Port Credit
– Mississauga: Streetsville
– New Tecumseth: Tottenham
– Newmarket
– Niagara Falls
– Niagara-On-The-Lake
– Oakville
– Oshawa
– Pelham
– Pickering: Ajax-Pickering
– Pickering: South Pickering
– Richmond Hill: Oak Ridges
– Richmond Hill: Richmond Hill
– Scugog: Port Perry
– St Catharines: St Catharines-Thorold
– Thorold: St Catharines-Thorold
– Uxbridge: Uxbridge
– Vaughan: Kleinburg
– Vaughan: Maple
– Vaughan: Thornhill
– Vaughan: Woodbridge
– Welland
– Whitby: Brooklin
– Whitby: Whitby
– Whitchurch-Stouffville: Stouffville

365
– Brampton: Castlemore
– Brampton: Snelgrove
– Clarington: Hampton
– Clarington: Newtonville
– Clarington: Orono
– East Gwillimbury: Mount Albert
– Fort Erie: Ridgeway
– Fort Erie: Stevensville
– Grimsby
– Haldimand County: Caledonia
– Haldimand County: Cayuga
– Haldimand County: Dunnville
– Haldimand County: Fisherville
– Haldimand County: Hagersville
– Haldimand County: Selkirk
– Hamilton: Binbrook
– Hamilton: Winona
– Lincoln: Beamsville
– Lincoln: Vineland
– Mississaugas Of The Credit First Nation: Hagersville
– New Tecumseth: Beeton
– Pickering: Claremont
– Port Colborne
– Richmond Hill: Gormley
– Scugog: Blackstock
– Thorold: Port Robinson
– Wainfleet
– West Lincoln: Wellandport
– West Lincoln: West Lincoln
– Whitchurch-Stouffville: Bethesda
– Whitchurch-Stouffville: Gormley

705
– Adjala-Tosorontio: Alliston
– Barrie
– Brock: Beaverton
– Brock: Cannington
– Brock: Sunderland
– Collingwood
– Espanola
– Georgian Bay: Honey Harbour
– Gravenhurst: Gravenhurst
– Huntsville: Huntsville
– Innisfil: Stroud
– Kawartha Lakes: Bobcaygeon
– Kawartha Lakes: Coboconk
– Kawartha Lakes: Fenelon Falls
– Kawartha Lakes: Lindsay
– Midland
– Mnjikaning First Nation: Orillia
– Mulmur: Alliston
– New Tecumseth: Alliston
– North Bay
– Orillia
– Penetanguishene
– Peterborough
– Sudbury: Azilda
– Sudbury: Blezard Valley
– Sudbury: Capreol
– Sudbury: Chelmsford
– Sudbury: Coniston
– Sudbury: Garson
– Sudbury: Hanmer
– Sudbury: Levack
– Sudbury: Lively
– Sudbury: Sudbury
– Trent Hills: Campbellford
– Wasaga Beach

249
– Algoma District: Batchawana Bay
– Algoma District: Chub Lake
– Algoma District: Goulais
– Algoma District: Hawk Junction
– Algoma District: Missanabie
– Algoma District: Oba
– Algoma District: Ophir
– Algoma District: Searchmont
– Algonquin Highlands: Dorset
– Algonquin Park
– Almaguin Highlands: Port Loring
– Almaguin Highlands: South River
– Archipelago: Pointe Au Baril
– Asphodel-Norwood: Norwood
– Beausoleil: Christian Island
– Blind River
– Bonfield
– Bracebridge
– Bruce Mines
– Burk’s Falls
– Callander
– Chapleau
– Clearview: Creemore
– Clearview: Stayner
– Curve Lake First Nation: Buckhorn
– Dokis
– Douro-Dummer: Lakefield
– Dubreuilville
– East Ferris: Callander
– Elliot Lake
– Essa: Borden-Angus
– French River: Alban
– French River: Noelville
– Garden River First Nation: Echo Bay
– Georgian Bay: Mactier
– Georgina: Pefferlaw
– Georgina: Udora
– Gravenhurst: Severn Bridge
– Havelock-Belmont-Methuen: Havelock
– Havelock-Belmont-Methuen: Nepthon
– Head Clara and Maria: Deux Rivieres
– Huntsville: Port Sydney
– Huron Shores: Iron Bridge
– Innisfil: Cookstown
– Innisfil: Lefroy
– Johnson: Desbarats
– Kawartha Lakes: Bethany
– Kawartha Lakes: Cameron
– Kawartha Lakes: Dunsford
– Kawartha Lakes: Kirkfield
– Kawartha Lakes: Little Britain
– Kawartha Lakes: Oakwood
– Kawartha Lakes: Omemee
– Kawartha Lakes: Sebright
– Kawartha Lakes: Woodville
– Killarney
– Lake Of Bays: Baysville
– Lake Of Bays: Dorset
– Lake Of Bays: Dwight
– Macdonald Meredith and Aberdeen Additional: Echo Bay
– Magnetawan
– Manitoulin District: Silverwater
– Markstay-Warren: Markstay
– Markstay-Warren: Warren
– Mattawa
– McDougall: Nobel
– McKellar
– McMurrich/Monteith: Sprucedale
– Muskoka Lakes: Bala
– Muskoka Lakes: Milford Bay
– Muskoka Lakes: Port Carling
– Muskoka Lakes: Windermere
– Nipissing District: Redbridge
– Nipissing District: Thorne
– Nipissing First Nation: Sturgeon Falls
– North Kawartha: Apsley
– Northeastern Manitoulin and the Islands: Little Current
– Oro-Medonte: Moonstone
– Oro-Medonte: Oro
– Otonabee-South Monaghan: Bailieboro
– Parry Sound
– Patterson: Restoule
– Perry: Emsdale
– Powassan: Powassan
– Powassan: Trout Creek
– Ramara: Brechin
– Sables-Spanish Rivers: Massey
– Sagamok Anishnawbek First Nation: Spanish
– Sault Ste Marie
– Seguin: Otter Lake
– Seguin: Rosseau
– Selwyn: Bridgenorth
– Selwyn: Burleigh Falls
– Selwyn: Lakefield
– Spanish
– Springwater: Elmvale
– St Charles
– St Joseph: St Joseph Island
– Sudbury District: Biscotasing
– Sudbury District: Cartier
– Sudbury District: Estaire
– Sudbury District: Gogama
– Sudbury District: Ramsay
– Sudbury District: Sultan
– Sudbury District: Westree
– Sudbury District: Whitefish Falls
– Sudbury: Whitefish
– Sundridge
– Tay: Port McNicoll
– Tay: Waubaushene
– The North Shore: Algoma Mills
– Thessalon
– Tiny: Bluewater
– Tiny: Lafontaine
– Trent Hills: Hastings
– Trent Hills: Warkworth
– Trent Lakes: Buckhorn
– Uxbridge: Udora
– Wallbridge: Britt
– Wawa
– West Nipissing: Field
– West Nipissing: Sturgeon Falls
– West Nipissing: Verner

613
– Athens
– Augusta: Maitland
– Augusta: North Augusta
– Bancroft
– Beckwith: Carleton Place
– Belleville: Belleville
– Brighton
– Brockville
– Carleton Place
– Centre Hastings: Madoc
– Edwardsburgh-Cardinal: Cardinal
– Edwardsburgh-Cardinal: Spencerville
– Front Of Yonge: Mallorytown
– Gananoque
– Kingston
– Madoc
– North Grenville: Kemptville
– Ottawa: Kanata-Stittsville
– Ottawa: Manotick
– Ottawa: Ottawa
– Prescott
– Prince Edward County: Picton
– Quinte West: Trenton
– Rideau Lakes: Delta