| Carlow to Navodari | 1,707.19 mi (2,747.46 km) |
| Carlow to Negresti-Oas | 1,370.29 mi (2,205.26 km) |
| Carlow to Nehoiu | 1,573.51 mi (2,532.31 km) |
| Carlow to Ocna Mures | 1,435.82 mi (2,310.72 km) |
| Carlow to Odobesti | 1,590.59 mi (2,559.81 km) |
| Carlow to Odorheiu Secuiesc | 1,498.34 mi (2,411.35 km) |
| Carlow to Oltenita | 1,634.16 mi (2,629.92 km) |
| Carlow to Onesti | 1,561.33 mi (2,512.72 km) |
| Carlow to Oradea | 1,332.64 mi (2,144.68 km) |
| Carlow to Orastie | 1,427.11 mi (2,296.72 km) |
| Carlow to Oravita | 1,394.24 mi (2,243.81 km) |
| Carlow to Orsova | 1,435.27 mi (2,309.85 km) |
| Carlow to Otelu Rosu | 1,403.99 mi (2,259.50 km) |
| Carlow to Otopeni | 1,593.18 mi (2,563.98 km) |
| Carlow to Ovidiu | 1,706.90 mi (2,746.98 km) |
