| Katy to Nuth | 5,117.47 mi (8,235.77 km) |
| Katy to Oegstgeest | 5,023.30 mi (8,084.22 km) |
| Katy to Oirschot | 5,076.41 mi (8,169.69 km) |
| Katy to Oisterwijk | 5,069.95 mi (8,159.30 km) |
| Katy to Oldebroek | 5,068.83 mi (8,157.50 km) |
| Katy to Oldenzaal | 5,111.65 mi (8,226.41 km) |
| Katy to Ommen | 5,085.94 mi (8,185.03 km) |
| Katy to Oosterend | 5,057.34 mi (8,139.00 km) |
| Katy to Oosterhout | 5,054.97 mi (8,135.18 km) |
| Katy to Oosterwolde | 5,066.06 mi (8,153.04 km) |
| Katy to Oostzaan | 5,031.26 mi (8,097.03 km) |
| Katy to Opmeer | 5,025.45 mi (8,087.69 km) |
| Katy to Oss | 5,076.18 mi (8,169.33 km) |
| Katy to Oud-Beijerland | 5,032.11 mi (8,098.39 km) |
| Katy to Oudenbosch | 5,043.91 mi (8,117.39 km) |
