| Groningen to Olympia Heights (Florida) | 4,689.22 mi (7,546.57 km) |
| Groningen to Omaha (Nebraska) | 4,459.33 mi (7,176.60 km) |
| Groningen to On Top of the World Designated Place (Florida) | 4,589.09 mi (7,385.42 km) |
| Groningen to Onalaska (Wisconsin) | 4,159.95 mi (6,694.79 km) |
| Groningen to Oneida (New York) | 3,640.45 mi (5,858.74 km) |
| Groningen to Oneonta (New York) | 3,646.60 mi (5,868.64 km) |
| Groningen to Ontario (California) | 5,543.70 mi (8,921.72 km) |
| Groningen to Ontario (Oregon) | 4,934.28 mi (7,940.96 km) |
| Groningen to Opa-locka (Florida) | 4,676.59 mi (7,526.24 km) |
| Groningen to Opelika (Alabama) | 4,523.72 mi (7,280.22 km) |
| Groningen to Opelousas (Louisiana) | 4,890.27 mi (7,870.13 km) |
| Groningen to Orange (California) | 5,563.97 mi (8,954.34 km) |
| Groningen to Orange (Texas) | 4,974.43 mi (8,005.57 km) |
| Groningen to Orange City (Florida) | 4,558.56 mi (7,336.29 km) |
| Groningen to Orangeburg (South Carolina) | 4,306.83 mi (6,931.17 km) |
