| Ontario | |
|---|---|
| County Number | 52 |
| Postal abbr. | ON |
| Capital | Toronto |
| Nickname | Yours to Discover, The Heartland Province |
| ISO | CA-ON |
| FIPS | CA08 |
| Name | County | Postal Code |
|---|---|---|
| Brussels | 3540 | N0G |
| Thornloe | 3554 | P0J |
| Courtright | 3538 | N0N |
| Pikwàkanagàn | 3547 | K0J |
| Avonmore | 3501 | K0C |
| Brunner | 3531 | N0K |
| Maxville | 3501 | K0C |
| Priceville | 3542 | N0C |
| Kinburn | 3506 | K0A |
| Thorold | 3526 | L2V |
| Name | State |
|---|---|
| Peterborough | Ontario |
| Frontenac | Ontario |
| Halton | Ontario |
| Niagara | Ontario |
| Ottawa | Ontario |
| Simcoe | Ontario |
| York | Ontario |
| Grey | Ontario |
| Durham | Ontario |
| Middlesex | Ontario |
| Waterloo | Ontario |
| Timiskaming | Ontario |
| Peel | Ontario |
| Lennox and Addington | Ontario |
| Manitoulin | Ontario |
| Haliburton | Ontario |
| Thunder Bay | Ontario |
| Rainy River | Ontario |
| Elgin | Ontario |
| Perth | Ontario |