| Colfontaine to Olympia Heights (Florida) | 4,621.29 mi (7,437.25 km) |
| Colfontaine to Omaha (Nebraska) | 4,477.16 mi (7,205.29 km) |
| Colfontaine to On Top of the World Designated Place (Florida) | 4,535.87 mi (7,299.78 km) |
| Colfontaine to Onalaska (Wisconsin) | 4,174.33 mi (6,717.93 km) |
| Colfontaine to Oneida (New York) | 3,616.13 mi (5,819.60 km) |
| Colfontaine to Oneonta (New York) | 3,618.54 mi (5,823.48 km) |
| Colfontaine to Ontario (California) | 5,599.43 mi (9,011.41 km) |
| Colfontaine to Ontario (Oregon) | 5,009.30 mi (8,061.70 km) |
| Colfontaine to Opa-locka (Florida) | 4,608.91 mi (7,417.33 km) |
| Colfontaine to Opelika (Alabama) | 4,489.03 mi (7,224.40 km) |
| Colfontaine to Opelousas (Louisiana) | 4,867.58 mi (7,833.61 km) |
| Colfontaine to Orange (California) | 5,619.81 mi (9,044.21 km) |
| Colfontaine to Orange (Texas) | 4,955.25 mi (7,974.70 km) |
| Colfontaine to Orange City (Florida) | 4,502.16 mi (7,245.52 km) |
| Colfontaine to Orangeburg (South Carolina) | 4,262.76 mi (6,860.24 km) |
