This guide provides a general timeline for the dates of incorporation of municipalities within the County of Simcoe.
Please note, that this guide is intended for general-information purposes only and does not include details pertaining to boundary adjustments resulting from all historical annexations.
The guide is also available as a PDF: SCA Guide to Municipal Dates of Incorporation
| Name | Initial Date of Incorporation | Predecessor | Successor |
|---|---|---|---|
| Adjala Township | 1850-01-01 | N/A | Adjala-Tosorontio Township |
| Adjala-Tosorontio Township | 1994-01-01 | Adjala Township Tosorontio Township Everett Police Village | – |
| Allandale Village | 1891-06-17 | Innisfil Township | Barrie (annexation) |
| Alliston Town | 1874-06-18 | N/A | New Tecumseth Town |
| Angus Police Village | 1920-01-29 | Essa Township | Essa Township |
| Barrie City | 1854-01-01 | Vespra Township | N/A |
| Beeton Village | 1884-06-18 | Tecumseth Township | New Tecumseth Town |
| Bradford Town | 1858-01-01 | West Gwillimbury Township | Bradford West Gwillimbury |
| Bradford West Gwillimbury Town | 1991-01-01 | Tecumseth Township West Gwillimbury Township Bradford Town | N/A |
| Brechin Police Village | 1909-02-17 | Mara Township | Ramara Township |
| Clearview Township | 1994-01-01 | Nottawasaga Township Sunnidale Township Stayner Town Creemore Village Nottawa Police Village | N/A |
| Coldwater Village | 1908-01-29 | Medonte Township | Severn Township |
| Collingwood Town | 1858-01-01 | Nottawasaga Township | N/A |
| Cookstown Village | 1905-03-31 | Essa Township Innisfil Township Tecumseth Township West Gwillimbury Township | Innisfil Town |
| Creemore Village | 1889-11-20 | Nottawasaga Township | Clearview Township |
| Elmvale Village | 1940-05-01 | Flos Township | Springwater Township |
| Essa and Tosorontio United Townships | 1850-01-01 | N/A | Essa Township Tosorontio Township |
| Essa Township (pre-1991) | 1850-01-01 | N/A | Essa Township Thornton Police Village |
| Essa Township (post-1990) | 1991-01-01 | Essa Township Thornton Police Village | N/A |
| Everett Police Village | 1909-01-29 | Tosorontio Township | Adjala-Tosorontio Township |
| Flos Township | 1854-01-01 | 1854-01-01 | Springwater Township Wasaga Beach |
| Hawkestone Police Village | 1922-12-01 | Oro Township | Oro-Medonte Township |
| Hillsdale Police Village | 1905-12-15 | Medonte Township | Springwater Township |
| Innisfil Town | 1991-01-01 | Cookstown Village Innisfil Township Gwillimbury Township | N/A |
| Innisfil Township | 1850-01-01 | N/A | Barrie Town (annexation) Innisfil Town |
| Mara and Rama United Townships | 1850-01-01 | N/A | Mara Township Rama Township |
| Mara Township | 1974-01-01 | Separated from Ontario County (incorporated 1850-01-01) | Ramara Township |
| Matchedash Township | 1887-06-14 | N/A | Severn Township |
| Medonte Township | 1850-01-01 | N/A | Oro-Medonte Township Severn Township Springwater Township |
| Midland Town | 1878-10-24 | Tiny Township | N/A |
| New Tecumseth Town | 1991-01-01 | Tecumseth Township Alliston Town Beeton Village Tottenham Village | N/A |
| Nottawa Police Village | 1920-06-01 | Nottawasaga Township | Clearview Township |
| Nottawasaga Township | 1851-01-01 | — | Clearview Township Collingwood Town Wasaga Beach Town |
| Orillia City | 1866-11-22 | Orillia Township | — |
| Orillia Township | 1852-01-01 | — | Oro-Medonte Township Severn Township |
| Oro-Medonte Township | 1994-01-01 | Medonte Township Oro Township Hawkstone Police Village | — |
| Penetanguishene Town | 1875-06-29 | Tiny Township | — |
| Port McNicoll Village | 1917-04-12 | Tay Township | Tay Township |
| Rama Township | 1974-01-01 | from Ontario County (incorporated 1869-01-01) | Ramara Township |
| Ramara Township | 1994-01-01 | Rama Township Mara Township Brechin Police Village | – |
| Severn Township | 1994-01-01 | Matchedash Township Medonte Township Orillia Township Tay Township Coldwater Village | – |
| Simcoe County | 1850-01-01 | Simcoe District | – |
| Simcoe District | 1843-01-11 | Home District | Simcoe County |
| Springwater Township | 1994-01-01 | Flos Township Vespra Township Elmvale Village Hillsdale Police Village | – |
| Stayner Town | 1872-06-26 | Nottawasaga Township | Clearview Township Sunnidale Township |
| Sunnidale Township | 1858-06-23 | Vespra, Flos and Sunnidale United Townships | Clearview Township Wasaga Beach Town |
| Tay Township (pre-1994) | 1869-01-04 | Tiny and Tay United Townships | Tay Township Severn Township |
| Tay Township (post-1993) | 1994-01-01 | Tay Township Port McNicholl Village Victoria Harbour Village | – |
| Tecumseth Township | 1850-01-01 | – | Bradford West Gwillimbury Town Innisfil Town New Tecumseth Town |
| Thornton Police Village | 1912-11-22 | Essa Township | Essa Township |
| Tiny and Tay United Townships | 1851-01-01 | – | Tiny Townships Tay Townships |
| Tosorontio Township | 1855-01-01 | Essa and Tosorontio United Townships | New Tecumseth Town of Adjala-Tosorontio |
| Tottenham Village | 1884-06-18 | Tecumseth Township | New Tecumseth Town |
| Vespra Township | 1850-01-01 | – | Barrie Town (annexation) Springwater Township |
| Vespra, Flos and Sunnidale United Townships | 1837-01-01 | – | – |
| Victoria Harbour Village | 1910-12-31 | Tay Township | Tay Township |
| Wasaga Beach Town | 1945-12-31 | Flos Township Nottawasaga Township Sunnidale Township | – |
| West Gwillimbury Township | 1850-01-01 | – | Innisfil Town Bradford W. Gwillimbury Town |