| Wilmette to Nuth | 4,187.99 mi (6,739.91 km) |
| Wilmette to Oegstgeest | 4,090.72 mi (6,583.38 km) |
| Wilmette to Oirschot | 4,145.42 mi (6,671.40 km) |
| Wilmette to Oisterwijk | 4,138.76 mi (6,660.70 km) |
| Wilmette to Oldebroek | 4,133.39 mi (6,652.06 km) |
| Wilmette to Oldenzaal | 4,175.39 mi (6,719.65 km) |
| Wilmette to Ommen | 4,149.61 mi (6,678.15 km) |
| Wilmette to Oosterend | 4,119.70 mi (6,630.01 km) |
| Wilmette to Oosterhout | 4,124.01 mi (6,636.96 km) |
| Wilmette to Oosterwolde | 4,128.20 mi (6,643.69 km) |
| Wilmette to Oostzaan | 4,097.17 mi (6,593.77 km) |
| Wilmette to Opmeer | 4,090.27 mi (6,582.66 km) |
| Wilmette to Oss | 4,143.84 mi (6,668.87 km) |
| Wilmette to Oud-Beijerland | 4,101.08 mi (6,600.05 km) |
| Wilmette to Oudenbosch | 4,113.63 mi (6,620.25 km) |
