| 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 |
|---|---|---|
| Gowanstown | 3531 | N0G |
| Selkirk | 3528 | N0A |
| Beachburg | 3547 | K0J |
| Wahnapitae | 3553 | P0M |
| Woodville | 3513 | K0M |
| Douro-Dummer | 3515 | K0L K9J |
| Varna | 3540 | N0M |
| Tehkummah | 3551 | P0P |
| Algonquin Highlands | 3546 | K0M |
| Cheltenham | 3521 | L7C |
| Name | State |
|---|---|
| Northumberland | Ontario |
| Simcoe | Ontario |
| Oxford | Ontario |
| Halton | Ontario |
| Toronto | Ontario |
| Brant | Ontario |
| Haliburton | Ontario |
| Timiskaming | Ontario |
| Lennox and Addington | Ontario |
| Huron | Ontario |
| Prince Edward | Ontario |
| Wellington | Ontario |
| York | Ontario |
| Niagara | Ontario |
| Durham | Ontario |
| Hamilton | Ontario |
| Cochrane | Ontario |
| Stormont, Dundas and Glengarry | Ontario |
| Middlesex | Ontario |
| Waterloo | Ontario |