| Ontario to Groveton (Virginia) | 2,257.75 mi (3,633.49 km) |
| Ontario to Grovetown (Georgia) | 2,023.92 mi (3,257.18 km) |
| Ontario to Guayama (Puerto Rico) | 3,346.62 mi (5,385.86 km) |
| Ontario to Guaynabo (Puerto Rico) | 3,332.42 mi (5,363.02 km) |
| Ontario to Gulf Shores (Alabama) | 1,762.09 mi (2,835.81 km) |
| Ontario to Gulfport (Florida) | 2,103.64 mi (3,385.48 km) |
| Ontario to Gulfport (Mississippi) | 1,680.81 mi (2,705.01 km) |
| Ontario to Gunbarrel (Colorado) | 800.99 mi (1,289.07 km) |
| Ontario to Gurnee (Illinois) | 1,700.09 mi (2,736.03 km) |
| Ontario to Guthrie (Oklahoma) | 1,147.11 mi (1,846.10 km) |
| Ontario to Guttenberg (New Jersey) | 2,412.35 mi (3,882.31 km) |
| Ontario to Guymon (Oklahoma) | 925.86 mi (1,490.03 km) |
| Ontario to Hacienda Heights (California) | 21.18 mi (34.09 km) |
| Ontario to Hackensack (New Jersey) | 2,409.84 mi (3,878.26 km) |
| Ontario to Hackettstown (New Jersey) | 2,369.28 mi (3,812.99 km) |
