| Lake Monticello to Oerlinghausen | 4,101.85 mi (6,601.29 km) |
| Lake Monticello to Oestrich-Winkel | 4,130.71 mi (6,647.74 km) |
| Lake Monticello to Offenburg | 4,172.31 mi (6,714.68 km) |
| Lake Monticello to Oftersheim | 4,172.63 mi (6,715.20 km) |
| Lake Monticello to Ohrdruf | 4,215.61 mi (6,784.37 km) |
| Lake Monticello to Ohringen | 4,214.95 mi (6,783.31 km) |
| Lake Monticello to Olbernhau | 4,322.35 mi (6,956.15 km) |
| Lake Monticello to Olching | 4,319.90 mi (6,952.21 km) |
| Lake Monticello to Oldenburg | 4,052.27 mi (6,521.49 km) |
| Lake Monticello to Oldenburg in Holstein | 4,120.82 mi (6,631.82 km) |
| Lake Monticello to Olfen | 4,058.41 mi (6,531.38 km) |
| Lake Monticello to Olpe | 4,095.42 mi (6,590.93 km) |
| Lake Monticello to Olsberg | 4,111.87 mi (6,617.41 km) |
| Lake Monticello to Oranienburg | 4,253.65 mi (6,845.58 km) |
| Lake Monticello to Ortenberg | 4,162.95 mi (6,699.61 km) |
