| Grevena to Orthez | 1,163.84 mi (1,873.02 km) |
| Grevena to Orvault | 1,248.26 mi (2,008.88 km) |
| Grevena to Osny | 1,131.99 mi (1,821.76 km) |
| Grevena to Ostwald | 893.01 mi (1,437.16 km) |
| Grevena to Ouistreham | 1,233.78 mi (1,985.57 km) |
| Grevena to Oullins | 924.40 mi (1,487.68 km) |
| Grevena to Outreau | 1,203.66 mi (1,937.10 km) |
| Grevena to Oyonnax | 899.64 mi (1,447.83 km) |
| Grevena to Ozoir-la-Ferriere | 1,098.27 mi (1,767.50 km) |
| Grevena to Pace | 1,271.89 mi (2,046.91 km) |
| Grevena to Palaiseau | 1,114.21 mi (1,793.15 km) |
| Grevena to Pamiers | 1,042.47 mi (1,677.69 km) |
| Grevena to Panazol | 1,088.42 mi (1,751.64 km) |
| Grevena to Pantin | 1,113.24 mi (1,791.59 km) |
| Grevena to Paray-le-Monial | 972.71 mi (1,565.42 km) |
