| Rommerskirchen to Olympia Heights (Florida) | 4,731.51 mi (7,614.62 km) |
| Rommerskirchen to Omaha (Nebraska) | 4,552.47 mi (7,326.49 km) |
| Rommerskirchen to On Top of the World Designated Place (Florida) | 4,640.96 mi (7,468.90 km) |
| Rommerskirchen to Onalaska (Wisconsin) | 4,251.12 mi (6,841.51 km) |
| Rommerskirchen to Oneida (New York) | 3,709.62 mi (5,970.06 km) |
| Rommerskirchen to Oneonta (New York) | 3,713.56 mi (5,976.39 km) |
| Rommerskirchen to Ontario (California) | 5,655.97 mi (9,102.41 km) |
| Rommerskirchen to Ontario (Oregon) | 5,054.85 mi (8,134.99 km) |
| Rommerskirchen to Opa-locka (Florida) | 4,719.04 mi (7,594.56 km) |
| Rommerskirchen to Opelika (Alabama) | 4,587.14 mi (7,382.28 km) |
| Rommerskirchen to Opelousas (Louisiana) | 4,961.04 mi (7,984.03 km) |
| Rommerskirchen to Orange (California) | 5,676.30 mi (9,135.13 km) |
| Rommerskirchen to Orange (Texas) | 5,047.30 mi (8,122.85 km) |
| Rommerskirchen to Orange City (Florida) | 4,608.37 mi (7,416.45 km) |
| Rommerskirchen to Orangeburg (South Carolina) | 4,364.36 mi (7,023.75 km) |
