| Nenagh to Oria | 1,479.91 mi (2,381.69 km) |
| Nenagh to Oristano | 1,194.90 mi (1,923.01 km) |
| Nenagh to Orta Nova | 1,367.77 mi (2,201.21 km) |
| Nenagh to Orte | 1,190.48 mi (1,915.89 km) |
| Nenagh to Ortona | 1,270.35 mi (2,044.44 km) |
| Nenagh to Orvieto | 1,168.00 mi (1,879.72 km) |
| Nenagh to Orzinuovi | 964.34 mi (1,551.96 km) |
| Nenagh to Osimo | 1,183.62 mi (1,904.86 km) |
| Nenagh to Ospitaletto | 962.97 mi (1,549.75 km) |
| Nenagh to Ostuni | 1,466.88 mi (2,360.71 km) |
| Nenagh to Ottaviano | 1,345.49 mi (2,165.35 km) |
| Nenagh to Ovada | 951.03 mi (1,530.53 km) |
| Nenagh to Ozieri | 1,170.38 mi (1,883.54 km) |
| Nenagh to Paceco | 1,428.46 mi (2,298.89 km) |
| Nenagh to Pachino | 1,583.23 mi (2,547.96 km) |
