| Zagarolo to Octeville | 879.19 mi (1,414.93 km) |
| Zagarolo to Oignies | 758.80 mi (1,221.17 km) |
| Zagarolo to Oissel | 767.47 mi (1,235.12 km) |
| Zagarolo to Olivet | 677.45 mi (1,090.25 km) |
| Zagarolo to Ollioules | 367.11 mi (590.80 km) |
| Zagarolo to Olonne-sur-Mer | 791.70 mi (1,274.12 km) |
| Zagarolo to Oloron-Sainte-Marie | 690.16 mi (1,110.70 km) |
| Zagarolo to Onet Village | 544.97 mi (877.04 km) |
| Zagarolo to Onnaing | 737.07 mi (1,186.20 km) |
| Zagarolo to Orange | 435.45 mi (700.80 km) |
| Zagarolo to Orchies | 751.78 mi (1,209.87 km) |
| Zagarolo to Orleans | 678.62 mi (1,092.13 km) |
| Zagarolo to Orly | 695.64 mi (1,119.53 km) |
| Zagarolo to Ormesson-sur-Marne | 692.40 mi (1,114.31 km) |
| Zagarolo to Orsay | 700.92 mi (1,128.02 km) |
