UpAlphabetical listing of Places in Ontario
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Tamworth | city | Ontario | Canada | 44.49 | -76.99 | 830 | 555 |
| Tander Bėjus | city | Ontario | Canada | 48.40 | -89.23 | 830 | 16841 |
| Tannin | city | Ontario | Canada | 49.65 | -91.00 | 1669 | 0 |
| Tashota | city | Ontario | Canada | 50.23 | -87.67 | 1030 | 0 |
| Tavistock | city | Ontario | Canada | 43.32 | -80.84 | 1102 | 3543 |
| Tecumseh | city | Ontario | Canada | 42.32 | -82.90 | 830 | 67089 |
| Teeswater | city | Ontario | Canada | 44.00 | -81.29 | 1003 | 2248 |
| Teeterville | city | Ontario | Canada | 42.94 | -80.44 | 830 | 2380 |
| Tehkummah | city | Ontario | Canada | 45.65 | -81.98 | 830 | 277 |
| Temiskaming Shores | city | Ontario | Canada | 47.50 | -79.67 | 830 | 7148 |
| Temiskaming Shores | city | Ontario | Canada | 47.43 | -79.63 | 830 | 3209 |
| Terrace Bay | city | Ontario | Canada | 48.78 | -87.10 | 846 | 1158 |
| Thamesford | city | Ontario | Canada | 43.06 | -80.99 | 915 | 3688 |
| Thamesville | city | Ontario | Canada | 42.55 | -81.97 | 830 | 1763 |
| Thedford | city | Ontario | Canada | 43.17 | -81.85 | 830 | 1872 |
| Thessalon | city | Ontario | Canada | 46.25 | -83.55 | 830 | 2084 |
| Thornbury | city | Ontario | Canada | 44.55 | -80.45 | 830 | 3534 |
| Thorndale | city | Ontario | Canada | 43.11 | -81.15 | 941 | 3672 |
| Thornhill | city | Ontario | Canada | 43.80 | -79.42 | 830 | 190146 |
| Thorold | city | Ontario | Canada | 43.12 | -79.20 | 830 | 49868 |
| Thunder Bay | city | Ontario | Canada | 48.40 | -89.23 | 830 | 16841 |
| Tichborne | city | Ontario | Canada | 44.67 | -76.67 | 830 | 379 |
| Tilbury | city | Ontario | Canada | 42.26 | -82.43 | 830 | 7367 |
| Tillsonburg | city | Ontario | Canada | 42.92 | -80.75 | 892 | 6791 |
| Tillsonburg | city | Ontario | Canada | 42.87 | -80.73 | 830 | 18280 |
| Tilsonburg | city | Ontario | Canada | 42.87 | -80.73 | 830 | 18280 |
| Timagami | city | Ontario | Canada | 47.07 | -79.78 | 1003 | 131 |
| Timmins | city | Ontario | Canada | 48.47 | -81.33 | 1036 | 6109 |
| Tionaga | city | Ontario | Canada | 48.08 | -82.10 | 1240 | 0 |
| Tobermory | city | Ontario | Canada | 45.25 | -81.67 | 830 | 147 |
| Toledo | city | Ontario | Canada | 44.74 | -75.99 | 396 | 1039 |
| Tomiko | city | Ontario | Canada | 46.57 | -79.42 | 1181 | 0 |
| Torontas | city | Ontario | Canada | 43.67 | -79.42 | 347 | 559282 |
| Toronto | city | Ontario | Canada | 43.67 | -79.42 | 347 | 559282 |
| Torontu | city | Ontario | Canada | 43.67 | -79.42 | 347 | 559282 |
| Torontum | city | Ontario | Canada | 43.67 | -79.42 | 347 | 559282 |
| Torrance | city | Ontario | Canada | 44.98 | -79.57 | 830 | 644 |
| Tottenham | city | Ontario | Canada | 44.02 | -79.80 | 830 | 9615 |
| Town of Bancroft | city | Ontario | Canada | 45.05 | -77.85 | 1099 | 3069 |
| Trenton | city | Ontario | Canada | 44.10 | -77.58 | 269 | 22320 |
| Trout Creek | city | Ontario | Canada | 45.98 | -79.37 | 1036 | 1583 |
| Trout Mills | city | Ontario | Canada | 46.33 | -79.42 | 830 | 17555 |
| Troy | city | Ontario | Canada | 43.26 | -80.19 | 830 | 1579 |
| Tudhope | city | Ontario | Canada | 49.25 | -81.67 | 830 | 347 |
| Tupperville | city | Ontario | Canada | 42.59 | -82.27 | 830 | 707 |
| Turbine | city | Ontario | Canada | 46.37 | -81.52 | 830 | 6 |
| Turkey Point | city | Ontario | Canada | 42.69 | -80.33 | 830 | 1238 |
| Turriff | city | Ontario | Canada | 44.98 | -77.73 | 1115 | 426 |
| Tweed | city | Ontario | Canada | 44.47 | -77.30 | 830 | 2345 |
| Twin Sandwich | city | Ontario | Canada | 42.28 | -83.07 | 830 | 118980 |
| Tyrone | city | Ontario | Canada | 44.02 | -78.72 | 830 | 4326 |
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