This is a list of numbered county roads in Simcoe County, Ontario.
| County Road # | Local Name(s) | Western/Northern Terminus (&) | Eastern/Southern Terminus (&) | Cities it passes by (Within Simcoe County) | Additional Notes/Traffic |
|---|---|---|---|---|---|
| 8th Line; Main Street | Simcoe County / Dufferin County Boundary | Ontario Highway 27 | New Tecumseth; Bradford West Gwillimbury; Adjala–Tosorontio | ||
| Shores Acres Road | Simcoe County Road 4 | Simcoe County Road 39 | Innisfil | ||
| Barrie Street; Yonge Street | Mapleview Drive East | Line 8 | Bradford West Gwillimbury; Innisfil | Extension of Yonge Street | |
| Canal Road | Simcoe County/York Region Boundary | Highway 9 | Bradford West Gwillimbury | ||
| Queen Street; Tottenham Road; Mill Street; Brentwood Road; Sunnidale Road | Nottawasaga Concession Road 12 | Highway 9 | New Tecumseth; Essa; Clearview | The road is interrupted near Highway 89 | |
| Old Barrie Road | Orillia, Oro–Medonte | ||||
| 5th Line | Simcoe County Road 50 | Simcoe County Road 10 | New Tecumseth; Adjala–Tosorontio | ||
| King Street North | Ontario Highway 89 | Canadian Forces Base Borden | Essa | ||
| West Street;Burnside Line | Orillia; Port Severn | ||||
| Shanty Bay Road; Ridge Road; Oro-Medonte Line 11 | Barrie/Oro-Medonte Townline | Oro–Medonte | |||
| Innisfil Beach Road | Ontario Highway 27 | 20th Sideroad | Innisfil | ||
| Highway 27 | Simcoe County Road 90 | Highway 9 | New Tecumseth; Bradford West Gwillimbury; Innisfil; Essa | The road stops at the Simcoe road 90 junction in Essa but can be picked up again in midhurst starting at the Bayfield street and Highway 26 intersection | |
| George Johnston Road | Highway 26 | Simcoe County Road 90 | Springwater | ||
| Essa Road | Mapleview Drive | Ontario Highway 27 | Barrie; | Downloaded to the expanded city of Barrie as of January 1, 2010.[1] | |
| South Sparrow Lake Road | Highway 11 | Orillia; Port Severn; | |||
| 20th Sideroad | Simcoe County Road 21 | Shore Acres Road | Innisfil, Ontario | ||
| Sunnidale Road | Simcoe County Road 90 | Barrie/Springwater Townline | Springwater | ||
| Airport Road | Simcoe County/ Dufferin County Boundary | Highway 26 | Links Simcoe County with Toronto Pearson International Airport. One of the busiest rural roads in Simcoe County. | ||
| Snow Valley Drive | Simcoe County Road 28 or George Johnston Road | Highway 26 | Springwater | ||
| 44 | Rama Road | Rama Road | Highway 12 | Rama | |
| 45 | Monck Road | Rama Road | Simcoe County/Kawartha Lakes Boundary | ||
| 49 | Memorial Avenue | Oro–Medonte; Orillia | |||
| 50 | Simcoe County Road 50 | Highway 89 | Highway 9, or the Simcoe County/Peel Region Boundary | Adjala–Tosorontio | Formerly Highway 50. |
| 52 | Coopers Falls Road | Simcoe County/Muskoka Boundary | Port Severn, Ontario | This road is also referred to as Muskoka Road 6 | |
| 54 | Huronia Road | Barrie/Innisfil Townline | Simcoe County Road 21 or Innisfil Beach Road | Innisfil | |
| 56 | Simcoe County Road 56 | Simcoe County Road 90 | Ontario Highway 89 | Essa | |
| 57 | Oro–Medonte Line 3 | Oro–Medonte | Often referred to as Gasoline Alley, for there are many gas stations and pumps along the intersection of this road and Highway 11 | ||
| 88 | Ontario Highway 88 | Ontario Highway 27 | 10th Sideroad | Bradford West Gwillimbury | |
| 89 | Ontario Highway 89 | Highway 400 | Simcoe County Road 4 | Innisfil | Extension of Ontario Highway 89 |
| 90 | Mill Street; Simcoe County Road 90 | Mill Street | Barrie/Essa Townline | Essa | |
| 93 | Penetanguishene Road | Springwater/Oro-Medonte/Barrie Townline | Highway 400 | Springwater | Formerly Ontario Highway 93. |
| 127 | Oro-Medonte Line 7 | Oro–Medonte | |||
| 169 | Ontario Highway 169 | Port Severn | Formerly Highway 69 and Highway 169. |
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