| Gross-Gerau to Olympia Heights (Florida) | 4,828.17 mi (7,770.19 km) |
| Gross-Gerau to Omaha (Nebraska) | 4,661.90 mi (7,502.61 km) |
| Gross-Gerau to On Top of the World Designated Place (Florida) | 4,740.96 mi (7,629.83 km) |
| Gross-Gerau to Onalaska (Wisconsin) | 4,360.34 mi (7,017.29 km) |
| Gross-Gerau to Oneida (New York) | 3,814.83 mi (6,139.37 km) |
| Gross-Gerau to Oneonta (New York) | 3,818.21 mi (6,144.82 km) |
| Gross-Gerau to Ontario (California) | 5,766.13 mi (9,279.68 km) |
| Gross-Gerau to Ontario (Oregon) | 5,164.14 mi (8,310.88 km) |
| Gross-Gerau to Opa-locka (Florida) | 4,815.76 mi (7,750.22 km) |
| Gross-Gerau to Opelika (Alabama) | 4,690.63 mi (7,548.84 km) |
| Gross-Gerau to Opelousas (Louisiana) | 5,066.36 mi (8,153.52 km) |
| Gross-Gerau to Orange (California) | 5,786.45 mi (9,312.40 km) |
| Gross-Gerau to Orange (Texas) | 5,153.11 mi (8,293.12 km) |
| Gross-Gerau to Orange City (Florida) | 4,707.69 mi (7,576.30 km) |
| Gross-Gerau to Orangeburg (South Carolina) | 4,466.21 mi (7,187.68 km) |
