| Ontario Sonipat | India Standard Time | -12:30 |
| Ontario West Richmond | Central Australia Time | -16:30 |
| Ontario Soraluze | Central European Time | -09:00 |
| Ontario Zweisimmen | Central European Time | -09:00 |
| Ontario Sorano | Central European Time | -09:00 |
| Ontario West Runton | United Kingdom Time | -08:00 |
| Ontario Soquel | Pacific Time | 00:00 |
| Ontario Zwiefalten | Central European Time | -09:00 |
| Ontario Sonoma | Pacific Time | 00:00 |
| Ontario West Ryde | Eastern Australia Time | -17:00 |
| Ontario Sonora | Pacific Time | 00:00 |
| Ontario Zwingenberg | Central European Time | -09:00 |
| Ontario South Brighton | Central Australia Time | -16:30 |
| Ontario West Perth | Western Australia Time | -15:00 |
| Ontario South Daytona | Eastern Time | -03:00 |
| Ontario West Point | Eastern Time | -03:00 |
| Ontario Talasari | India Standard Time | -12:30 |
| Ontario West Portsmouth | Eastern Time | -03:00 |
| Ontario Talat Chinda | Indochina Time | -14:00 |
| Ontario West Park | Eastern Time | -03:00 |
| Ontario Tama Ward | Japan Time | -16:00 |
| Ontario Yeniçiftlik | Turkey Time | -10:00 |
| Ontario Tamaka | India Standard Time | -12:30 |
| Ontario Yenifoça | Turkey Time | -10:00 |
| Ontario Talung | Indochina Time | -14:00 |
| Ontario Yenda | Eastern Australia Time | -17:00 |
| Ontario Tallarevu | India Standard Time | -12:30 |
| Ontario Yorktown Heights | Eastern Time | -03:00 |
| Ontario Tamborine Mountain | Eastern Australia Time | -17:00 |
| Ontario Yodogawa Ward | Japan Time | -16:00 |
| Ontario Tambon Don Huaro | Indochina Time | -14:00 |
| Ontario Yermo | Pacific Time | 00:00 |
| Ontario Wolfschlugen | Central European Time | -09:00 |
| Ontario Yeroskipou | Eastern European Time | -10:00 |
| Ontario Wolfville | Atlantic Time | -04:00 |
| Ontario Vilanova del Camí | Central European Time | -09:00 |
| Ontario Wolkersdorf im Weinviertel | Central European Time | -09:00 |
| Ontario Vila Nova de Famalicão | Western European Time | -08:00 |
| Ontario Wohratal | Central European Time | -09:00 |
| Ontario Vila Flores | Brasilia Time | -04:00 |
| Ontario Wommelgem | Central European Time | -09:00 |
| Ontario Vieux-Mareuil | Central European Time | -09:00 |
| Ontario Wolverton | United Kingdom Time | -08:00 |
| Ontario Vijapadi | India Standard Time | -12:30 |
| Ontario Woodbridge | Eastern Time | -03:00 |
| Ontario Vieques | Atlantic Time | -03:00 |
| Ontario Woodbridge Township | Eastern Time | -03:00 |
| Ontario Trichiana | Central European Time | -09:00 |
| Ontario Wivenhoe | United Kingdom Time | -08:00 |
| Ontario Vidor | Central Time | -02:00 |