| Giessen to Olympia Heights (Florida) | 4,822.95 mi (7,761.78 km) |
| Giessen to Omaha (Nebraska) | 4,640.00 mi (7,467.36 km) |
| Giessen to On Top of the World Designated Place (Florida) | 4,732.66 mi (7,616.48 km) |
| Giessen to Onalaska (Wisconsin) | 4,339.05 mi (6,983.03 km) |
| Giessen to Oneida (New York) | 3,800.67 mi (6,116.58 km) |
| Giessen to Oneonta (New York) | 3,804.77 mi (6,123.18 km) |
| Giessen to Ontario (California) | 5,737.62 mi (9,233.80 km) |
| Giessen to Ontario (Oregon) | 5,132.55 mi (8,260.04 km) |
| Giessen to Opa-locka (Florida) | 4,810.49 mi (7,741.73 km) |
| Giessen to Opelika (Alabama) | 4,678.60 mi (7,529.47 km) |
| Giessen to Opelousas (Louisiana) | 5,052.03 mi (8,130.45 km) |
| Giessen to Orange (California) | 5,757.92 mi (9,266.48 km) |
| Giessen to Orange (Texas) | 5,138.10 mi (8,268.97 km) |
| Giessen to Orange City (Florida) | 4,700.05 mi (7,563.99 km) |
| Giessen to Orangeburg (South Carolina) | 4,456.02 mi (7,171.26 km) |
