| Grants Pass to Olympia Heights (Florida) | 2,681.66 mi (4,315.72 km) |
| Grants Pass to Omaha (Nebraska) | 1,400.29 mi (2,253.55 km) |
| Grants Pass to On Top of the World Designated Place (Florida) | 2,449.80 mi (3,942.58 km) |
| Grants Pass to Onalaska (Wisconsin) | 1,611.94 mi (2,594.17 km) |
| Grants Pass to Oneida (New York) | 2,385.53 mi (3,839.14 km) |
| Grants Pass to Oneonta (New York) | 2,426.55 mi (3,905.16 km) |
| Grants Pass to Ontario (California) | 657.56 mi (1,058.24 km) |
| Grants Pass to Ontario (Oregon) | 338.25 mi (544.35 km) |
| Grants Pass to Opa-locka (Florida) | 2,678.63 mi (4,310.84 km) |
| Grants Pass to Opelika (Alabama) | 2,165.57 mi (3,485.15 km) |
| Grants Pass to Opelousas (Louisiana) | 1,906.70 mi (3,068.53 km) |
| Grants Pass to Orange (California) | 666.86 mi (1,073.20 km) |
| Grants Pass to Orange (Texas) | 1,840.55 mi (2,962.08 km) |
| Grants Pass to Orange City (Florida) | 2,506.70 mi (4,034.14 km) |
| Grants Pass to Orangeburg (South Carolina) | 2,367.79 mi (3,810.59 km) |
