| Lake Monticello to Nuth | 4,020.09 mi (6,469.72 km) |
| Lake Monticello to Oegstgeest | 3,931.17 mi (6,326.61 km) |
| Lake Monticello to Oirschot | 3,981.50 mi (6,407.60 km) |
| Lake Monticello to Oisterwijk | 3,975.37 mi (6,397.74 km) |
| Lake Monticello to Oldebroek | 3,980.90 mi (6,406.64 km) |
| Lake Monticello to Oldenzaal | 4,024.75 mi (6,477.21 km) |
| Lake Monticello to Ommen | 3,999.37 mi (6,436.37 km) |
| Lake Monticello to Oosterend | 3,973.33 mi (6,394.45 km) |
| Lake Monticello to Oosterhout | 3,960.16 mi (6,373.27 km) |
| Lake Monticello to Oosterwolde | 3,982.37 mi (6,409.00 km) |
| Lake Monticello to Oostzaan | 3,941.43 mi (6,343.12 km) |
| Lake Monticello to Opmeer | 3,937.46 mi (6,336.73 km) |
| Lake Monticello to Oss | 3,983.27 mi (6,410.46 km) |
| Lake Monticello to Oud-Beijerland | 3,937.59 mi (6,336.94 km) |
| Lake Monticello to Oudenbosch | 3,948.22 mi (6,354.04 km) |
