| Monroe to Oerlinghausen | 4,901.43 mi (7,888.09 km) |
| Monroe to Oestrich-Winkel | 4,941.59 mi (7,952.73 km) |
| Monroe to Offenburg | 4,990.51 mi (8,031.45 km) |
| Monroe to Oftersheim | 4,985.62 mi (8,023.59 km) |
| Monroe to Ohrdruf | 5,017.75 mi (8,075.28 km) |
| Monroe to Ohringen | 5,027.28 mi (8,090.62 km) |
| Monroe to Olbernhau | 5,120.58 mi (8,240.78 km) |
| Monroe to Olching | 5,133.83 mi (8,262.09 km) |
| Monroe to Oldenburg | 4,845.97 mi (7,798.84 km) |
| Monroe to Oldenburg in Holstein | 4,903.00 mi (7,890.62 km) |
| Monroe to Olfen | 4,861.44 mi (7,823.73 km) |
| Monroe to Olpe | 4,901.43 mi (7,888.08 km) |
| Monroe to Olsberg | 4,915.08 mi (7,910.05 km) |
| Monroe to Oranienburg | 5,040.61 mi (8,112.08 km) |
| Monroe to Ortenberg | 4,970.35 mi (7,999.01 km) |
