| Langenfeld to Olympia Heights (Florida) | 4,740.91 mi (7,629.76 km) |
| Langenfeld to Omaha (Nebraska) | 4,558.10 mi (7,335.55 km) |
| Langenfeld to On Top of the World Designated Place (Florida) | 4,649.78 mi (7,483.10 km) |
| Langenfeld to Onalaska (Wisconsin) | 4,256.91 mi (6,850.84 km) |
| Langenfeld to Oneida (New York) | 3,717.21 mi (5,982.27 km) |
| Langenfeld to Oneonta (New York) | 3,721.31 mi (5,988.87 km) |
| Langenfeld to Ontario (California) | 5,659.63 mi (9,108.29 km) |
| Langenfeld to Ontario (Oregon) | 5,057.43 mi (8,139.15 km) |
| Langenfeld to Opa-locka (Florida) | 4,728.43 mi (7,609.68 km) |
| Langenfeld to Opelika (Alabama) | 4,595.19 mi (7,395.24 km) |
| Langenfeld to Opelousas (Louisiana) | 4,968.58 mi (7,996.15 km) |
| Langenfeld to Orange (California) | 5,679.95 mi (9,140.99 km) |
| Langenfeld to Orange (Texas) | 5,054.68 mi (8,134.72 km) |
| Langenfeld to Orange City (Florida) | 4,617.32 mi (7,430.85 km) |
| Langenfeld to Orangeburg (South Carolina) | 4,372.80 mi (7,037.34 km) |
