| Ontario to Fortuna (California) | 577.20 mi (928.92 km) |
| Ontario to Fortuna Foothills (Arizona) | 208.22 mi (335.10 km) |
| Ontario to Foster City (California) | 356.56 mi (573.82 km) |
| Ontario to Fostoria (Ohio) | 1,921.97 mi (3,093.11 km) |
| Ontario to Fountain (Colorado) | 786.57 mi (1,265.87 km) |
| Ontario to Fountain Hills (Arizona) | 338.01 mi (543.98 km) |
| Ontario to Fountain Inn (South Carolina) | 2,009.22 mi (3,233.53 km) |
| Ontario to Fountain Valley (California) | 30.13 mi (48.49 km) |
| Ontario to Fountainebleau (Florida) | 2,290.04 mi (3,685.46 km) |
| Ontario to Four Corners (Oregon) | 804.52 mi (1,294.74 km) |
| Ontario to Four Corners (Texas) | 1,320.07 mi (2,124.45 km) |
| Ontario to Four Square Mile (Colorado) | 802.79 mi (1,291.97 km) |
| Ontario to Fox Crossing (Wisconsin) | 1,700.65 mi (2,736.93 km) |
| Ontario to Fox Lake (Illinois) | 1,688.41 mi (2,717.24 km) |
| Ontario to Framingham (Massachusetts) | 2,539.68 mi (4,087.22 km) |
