| Ammon to Olympia Heights (Florida) | 2,155.82 mi (3,469.46 km) |
| Ammon to Omaha (Nebraska) | 824.78 mi (1,327.35 km) |
| Ammon to On Top of the World Designated Place (Florida) | 1,912.22 mi (3,077.42 km) |
| Ammon to Onalaska (Wisconsin) | 1,034.46 mi (1,664.81 km) |
| Ammon to Oneida (New York) | 1,811.35 mi (2,915.09 km) |
| Ammon to Oneonta (New York) | 1,851.18 mi (2,979.18 km) |
| Ammon to Ontario (California) | 719.03 mi (1,157.16 km) |
| Ammon to Ontario (Oregon) | 253.35 mi (407.73 km) |
| Ammon to Opa-locka (Florida) | 2,151.43 mi (3,462.39 km) |
| Ammon to Opelika (Alabama) | 1,617.58 mi (2,603.24 km) |
| Ammon to Opelousas (Louisiana) | 1,408.91 mi (2,267.42 km) |
| Ammon to Orange (California) | 738.87 mi (1,189.09 km) |
| Ammon to Orange (Texas) | 1,359.83 mi (2,188.43 km) |
| Ammon to Orange City (Florida) | 1,966.45 mi (3,164.69 km) |
| Ammon to Orangeburg (South Carolina) | 1,804.17 mi (2,903.54 km) |
