| Cirencester to Orbetello | 889.39 mi (1,431.34 km) |
| Cirencester to Oria | 1,210.79 mi (1,948.57 km) |
| Cirencester to Oristano | 959.48 mi (1,544.13 km) |
| Cirencester to Orta Nova | 1,100.08 mi (1,770.41 km) |
| Cirencester to Orte | 927.08 mi (1,491.99 km) |
| Cirencester to Ortona | 1,002.54 mi (1,613.43 km) |
| Cirencester to Orvieto | 904.43 mi (1,455.55 km) |
| Cirencester to Orzinuovi | 696.24 mi (1,120.49 km) |
| Cirencester to Osimo | 914.42 mi (1,471.62 km) |
| Cirencester to Ospitaletto | 693.96 mi (1,116.83 km) |
| Cirencester to Ostuni | 1,197.35 mi (1,926.95 km) |
| Cirencester to Ottaviano | 1,081.87 mi (1,741.10 km) |
| Cirencester to Ovada | 690.36 mi (1,111.03 km) |
| Cirencester to Ozieri | 929.21 mi (1,495.43 km) |
| Cirencester to Paceco | 1,181.27 mi (1,901.08 km) |
