| Calexico to Nuth | 5,650.76 mi (9,094.02 km) |
| Calexico to Oegstgeest | 5,546.62 mi (8,926.42 km) |
| Calexico to Oirschot | 5,604.76 mi (9,020.00 km) |
| Calexico to Oisterwijk | 5,597.70 mi (9,008.63 km) |
| Calexico to Oldebroek | 5,578.53 mi (8,977.78 km) |
| Calexico to Oldenzaal | 5,616.41 mi (9,038.74 km) |
| Calexico to Ommen | 5,591.14 mi (8,998.07 km) |
| Calexico to Oosterend | 5,557.36 mi (8,943.70 km) |
| Calexico to Oosterhout | 5,584.09 mi (8,986.72 km) |
| Calexico to Oosterwolde | 5,564.79 mi (8,955.66 km) |
| Calexico to Oostzaan | 5,547.96 mi (8,928.58 km) |
| Calexico to Opmeer | 5,537.56 mi (8,911.84 km) |
| Calexico to Oss | 5,598.98 mi (9,010.69 km) |
| Calexico to Oud-Beijerland | 5,561.56 mi (8,950.47 km) |
| Calexico to Oudenbosch | 5,576.07 mi (8,973.82 km) |
