| Gurnee to Nuth | 4,181.75 mi (6,729.88 km) |
| Gurnee to Oegstgeest | 4,084.20 mi (6,572.89 km) |
| Gurnee to Oirschot | 4,139.05 mi (6,661.15 km) |
| Gurnee to Oisterwijk | 4,132.38 mi (6,650.42 km) |
| Gurnee to Oldebroek | 4,126.58 mi (6,641.09 km) |
| Gurnee to Oldenzaal | 4,168.48 mi (6,708.52 km) |
| Gurnee to Ommen | 4,142.70 mi (6,667.03 km) |
| Gurnee to Oosterend | 4,112.65 mi (6,618.67 km) |
| Gurnee to Oosterhout | 4,117.65 mi (6,626.72 km) |
| Gurnee to Oosterwolde | 4,121.12 mi (6,632.30 km) |
| Gurnee to Oostzaan | 4,090.51 mi (6,583.03 km) |
| Gurnee to Opmeer | 4,083.49 mi (6,571.75 km) |
| Gurnee to Oss | 4,137.34 mi (6,658.40 km) |
| Gurnee to Oud-Beijerland | 4,094.71 mi (6,589.80 km) |
| Gurnee to Oudenbosch | 4,107.34 mi (6,610.13 km) |
