| Calexico to Oerlinghausen | 5,685.66 mi (9,150.19 km) |
| Calexico to Oestrich-Winkel | 5,761.64 mi (9,272.47 km) |
| Calexico to Offenburg | 5,834.53 mi (9,389.77 km) |
| Calexico to Oftersheim | 5,810.93 mi (9,351.80 km) |
| Calexico to Ohrdruf | 5,804.09 mi (9,340.78 km) |
| Calexico to Ohringen | 5,848.13 mi (9,411.66 km) |
| Calexico to Olbernhau | 5,888.58 mi (9,476.76 km) |
| Calexico to Olching | 5,955.19 mi (9,583.95 km) |
| Calexico to Oldenburg | 5,614.61 mi (9,035.83 km) |
| Calexico to Oldenburg in Holstein | 5,633.37 mi (9,066.04 km) |
| Calexico to Olfen | 5,659.04 mi (9,107.35 km) |
| Calexico to Olpe | 5,706.84 mi (9,184.27 km) |
| Calexico to Olsberg | 5,710.43 mi (9,190.05 km) |
| Calexico to Oranienburg | 5,777.40 mi (9,297.83 km) |
| Calexico to Ortenberg | 5,776.92 mi (9,297.06 km) |
