| New Carrollton to Oerlinghausen | 3,995.19 mi (6,429.63 km) |
| New Carrollton to Oestrich-Winkel | 4,024.04 mi (6,476.06 km) |
| New Carrollton to Offenburg | 4,065.73 mi (6,543.16 km) |
| New Carrollton to Oftersheim | 4,065.97 mi (6,543.55 km) |
| New Carrollton to Ohrdruf | 4,108.93 mi (6,612.69 km) |
| New Carrollton to Ohringen | 4,108.29 mi (6,611.66 km) |
| New Carrollton to Olbernhau | 4,215.70 mi (6,784.51 km) |
| New Carrollton to Olching | 4,213.26 mi (6,780.58 km) |
| New Carrollton to Oldenburg | 3,945.68 mi (6,349.95 km) |
| New Carrollton to Oldenburg in Holstein | 4,014.46 mi (6,460.64 km) |
| New Carrollton to Olfen | 3,951.73 mi (6,359.69 km) |
| New Carrollton to Olpe | 3,988.73 mi (6,419.23 km) |
| New Carrollton to Olsberg | 4,005.19 mi (6,445.72 km) |
| New Carrollton to Oranienburg | 4,147.16 mi (6,674.21 km) |
| New Carrollton to Ortenberg | 4,056.26 mi (6,527.91 km) |
