| McKeesport to Nuth | 3,968.21 mi (6,386.22 km) |
| McKeesport to Oegstgeest | 3,876.27 mi (6,238.26 km) |
| McKeesport to Oirschot | 3,928.19 mi (6,321.81 km) |
| McKeesport to Oisterwijk | 3,921.87 mi (6,311.64 km) |
| McKeesport to Oldebroek | 3,923.84 mi (6,314.80 km) |
| McKeesport to Oldenzaal | 3,967.21 mi (6,384.61 km) |
| McKeesport to Ommen | 3,941.63 mi (6,343.44 km) |
| McKeesport to Oosterend | 3,914.25 mi (6,299.37 km) |
| McKeesport to Oosterhout | 3,906.77 mi (6,287.33 km) |
| McKeesport to Oosterwolde | 3,923.14 mi (6,313.68 km) |
| McKeesport to Oostzaan | 3,885.31 mi (6,252.81 km) |
| McKeesport to Opmeer | 3,880.37 mi (6,244.86 km) |
| McKeesport to Oss | 3,928.86 mi (6,322.89 km) |
| McKeesport to Oud-Beijerland | 3,884.01 mi (6,250.71 km) |
| McKeesport to Oudenbosch | 3,895.30 mi (6,268.89 km) |
