| Crofton to Olympia Heights (Florida) | 942.53 mi (1,516.86 km) |
| Crofton to Omaha (Nebraska) | 1,032.80 mi (1,662.13 km) |
| Crofton to On Top of the World Designated Place (Florida) | 755.68 mi (1,216.16 km) |
| Crofton to Onalaska (Wisconsin) | 822.76 mi (1,324.10 km) |
| Crofton to Oneida (New York) | 285.65 mi (459.71 km) |
| Crofton to Oneonta (New York) | 252.28 mi (406.00 km) |
| Crofton to Ontario (California) | 2,278.82 mi (3,667.41 km) |
| Crofton to Ontario (Oregon) | 2,091.83 mi (3,366.48 km) |
| Crofton to Opa-locka (Florida) | 929.57 mi (1,496.00 km) |
| Crofton to Opelika (Alabama) | 655.14 mi (1,054.35 km) |
| Crofton to Opelousas (Louisiana) | 1,050.35 mi (1,690.38 km) |
| Crofton to Orange (California) | 2,296.17 mi (3,695.33 km) |
| Crofton to Orange (Texas) | 1,146.72 mi (1,845.47 km) |
| Crofton to Orange City (Florida) | 744.51 mi (1,198.17 km) |
| Crofton to Orangeburg (South Carolina) | 447.05 mi (719.46 km) |
