| Carlow to Novi di Modena | 974.47 mi (1,568.26 km) |
| Carlow to Novi Ligure | 903.77 mi (1,454.48 km) |
| Carlow to Nuoro | 1,154.09 mi (1,857.32 km) |
| Carlow to Occhiobello | 998.65 mi (1,607.16 km) |
| Carlow to Oderzo | 996.96 mi (1,604.45 km) |
| Carlow to Oggiono | 877.25 mi (1,411.80 km) |
| Carlow to Olbia | 1,126.12 mi (1,812.32 km) |
| Carlow to Oleggio | 859.10 mi (1,382.58 km) |
| Carlow to Olgiate Comasco | 863.07 mi (1,388.97 km) |
| Carlow to Olgiate Olona | 866.72 mi (1,394.85 km) |
| Carlow to Omegna | 838.27 mi (1,349.07 km) |
| Carlow to Opera | 890.23 mi (1,432.69 km) |
| Carlow to Oppeano | 967.06 mi (1,556.33 km) |
| Carlow to Orbassano | 848.00 mi (1,364.72 km) |
| Carlow to Orbetello | 1,103.10 mi (1,775.26 km) |
