| Carlow to Oerlinghausen | 658.99 mi (1,060.55 km) |
| Carlow to Oestrich-Winkel | 671.07 mi (1,079.99 km) |
| Carlow to Offenburg | 715.88 mi (1,152.10 km) |
| Carlow to Oftersheim | 712.69 mi (1,146.96 km) |
| Carlow to Ohrdruf | 764.82 mi (1,230.86 km) |
| Carlow to Ohringen | 754.99 mi (1,215.03 km) |
| Carlow to Olbernhau | 876.61 mi (1,410.77 km) |
| Carlow to Olching | 860.24 mi (1,384.42 km) |
| Carlow to Oldenburg | 629.16 mi (1,012.53 km) |
| Carlow to Oldenburg in Holstein | 736.03 mi (1,184.53 km) |
| Carlow to Olfen | 609.04 mi (980.16 km) |
| Carlow to Olpe | 640.30 mi (1,030.46 km) |
| Carlow to Olsberg | 661.03 mi (1,063.82 km) |
| Carlow to Oranienburg | 839.91 mi (1,351.70 km) |
| Carlow to Ortenberg | 705.57 mi (1,135.51 km) |
