| Ennis to Oria | 1,509.14 mi (2,428.72 km) |
| Ennis to Oristano | 1,218.74 mi (1,961.37 km) |
| Ennis to Orta Nova | 1,396.71 mi (2,247.78 km) |
| Ennis to Orte | 1,218.66 mi (1,961.24 km) |
| Ennis to Ortona | 1,299.36 mi (2,091.12 km) |
| Ennis to Orvieto | 1,196.23 mi (1,925.14 km) |
| Ennis to Orzinuovi | 993.57 mi (1,598.99 km) |
| Ennis to Osimo | 1,212.96 mi (1,952.07 km) |
| Ennis to Ospitaletto | 992.38 mi (1,597.08 km) |
| Ennis to Ostuni | 1,496.20 mi (2,407.90 km) |
| Ennis to Ottaviano | 1,373.62 mi (2,210.63 km) |
| Ennis to Ovada | 978.93 mi (1,575.44 km) |
| Ennis to Ozieri | 1,195.06 mi (1,923.27 km) |
| Ennis to Paceco | 1,453.78 mi (2,339.63 km) |
| Ennis to Pachino | 1,609.31 mi (2,589.94 km) |
