| Ontario to Grand Junction (Colorado) | 610.48 mi (982.47 km) |
| Ontario to Grand Prairie (Texas) | 1,189.59 mi (1,914.46 km) |
| Ontario to Grand Rapids (Michigan) | 1,821.21 mi (2,930.95 km) |
| Ontario to Grand Rapids (Minnesota) | 1,546.63 mi (2,489.05 km) |
| Ontario to Grand Terrace (California) | 16.80 mi (27.03 km) |
| Ontario to Grandview (Missouri) | 1,321.68 mi (2,127.04 km) |
| Ontario to Grandview (Washington) | 851.91 mi (1,371.01 km) |
| Ontario to Grandville (Michigan) | 1,815.54 mi (2,921.83 km) |
| Ontario to Granger (Indiana) | 1,785.25 mi (2,873.07 km) |
| Ontario to Granite Bay (California) | 381.62 mi (614.16 km) |
| Ontario to Granite City (Illinois) | 1,556.28 mi (2,504.59 km) |
| Ontario to Grants Pass (Oregon) | 657.56 mi (1,058.24 km) |
| Ontario to Grantsville (Utah) | 534.37 mi (859.99 km) |
| Ontario to Grapevine (Texas) | 1,183.64 mi (1,904.89 km) |
| Ontario to Grass Valley (California) | 405.89 mi (653.22 km) |
