| Mariestad to Olympia Heights (Florida) | 4,857.87 mi (7,817.98 km) |
| Mariestad to Omaha (Nebraska) | 4,455.27 mi (7,170.06 km) |
| Mariestad to On Top of the World Designated Place (Florida) | 4,729.20 mi (7,610.91 km) |
| Mariestad to Onalaska (Wisconsin) | 4,167.05 mi (6,706.22 km) |
| Mariestad to Oneida (New York) | 3,734.74 mi (6,010.48 km) |
| Mariestad to Oneonta (New York) | 3,748.36 mi (6,032.40 km) |
| Mariestad to Ontario (California) | 5,447.65 mi (8,767.14 km) |
| Mariestad to Ontario (Oregon) | 4,803.76 mi (7,730.91 km) |
| Mariestad to Opa-locka (Florida) | 4,844.87 mi (7,797.06 km) |
| Mariestad to Opelika (Alabama) | 4,627.03 mi (7,446.49 km) |
| Mariestad to Opelousas (Louisiana) | 4,964.77 mi (7,990.03 km) |
| Mariestad to Orange (California) | 5,467.48 mi (8,799.06 km) |
| Mariestad to Orange (Texas) | 5,040.76 mi (8,112.32 km) |
| Mariestad to Orange City (Florida) | 4,705.44 mi (7,572.68 km) |
| Mariestad to Orangeburg (South Carolina) | 4,431.79 mi (7,132.28 km) |
