| Campagna to Olympia Heights (Florida) | 5,348.10 mi (8,606.94 km) |
| Campagna to Omaha (Nebraska) | 5,323.94 mi (8,568.06 km) |
| Campagna to On Top of the World Designated Place (Florida) | 5,292.42 mi (8,517.33 km) |
| Campagna to Onalaska (Wisconsin) | 5,019.38 mi (8,077.91 km) |
| Campagna to Oneida (New York) | 4,424.93 mi (7,121.24 km) |
| Campagna to Oneonta (New York) | 4,422.51 mi (7,117.34 km) |
| Campagna to Ontario (California) | 6,462.14 mi (10,399.82 km) |
| Campagna to Ontario (Oregon) | 5,871.89 mi (9,449.90 km) |
| Campagna to Opa-locka (Florida) | 5,336.38 mi (8,588.08 km) |
| Campagna to Opelika (Alabama) | 5,277.02 mi (8,492.54 km) |
| Campagna to Opelousas (Louisiana) | 5,670.43 mi (9,125.68 km) |
| Campagna to Orange (California) | 6,482.54 mi (10,432.63 km) |
| Campagna to Orange (Texas) | 5,762.35 mi (9,273.60 km) |
| Campagna to Orange City (Florida) | 5,253.13 mi (8,454.10 km) |
| Campagna to Orangeburg (South Carolina) | 5,037.71 mi (8,107.41 km) |
