| Carlow to Oberkirch | 719.49 mi (1,157.91 km) |
| Carlow to Obernburg am Main | 722.18 mi (1,162.23 km) |
| Carlow to Obernkirchen | 674.04 mi (1,084.76 km) |
| Carlow to Oberschleissheim | 868.71 mi (1,398.05 km) |
| Carlow to Oberstdorf | 846.62 mi (1,362.50 km) |
| Carlow to Obertraubling | 871.00 mi (1,401.74 km) |
| Carlow to Obertshausen | 703.56 mi (1,132.28 km) |
| Carlow to Oberursel | 689.54 mi (1,109.71 km) |
| Carlow to Ochsenfurt | 765.34 mi (1,231.69 km) |
| Carlow to Ochsenhausen | 809.61 mi (1,302.95 km) |
| Carlow to Ochtrup | 594.35 mi (956.51 km) |
| Carlow to Odenthal | 610.19 mi (982.01 km) |
| Carlow to Oelde | 639.30 mi (1,028.85 km) |
| Carlow to Oelsnitz | 833.39 mi (1,341.21 km) |
| Carlow to Oer-Erkenschwick | 604.68 mi (973.14 km) |
