| Viseu to Oerlinghausen | 1,106.72 mi (1,781.10 km) |
| Viseu to Oestrich-Winkel | 1,003.09 mi (1,614.32 km) |
| Viseu to Offenburg | 945.29 mi (1,521.30 km) |
| Viseu to Oftersheim | 1,001.96 mi (1,612.51 km) |
| Viseu to Ohrdruf | 1,135.32 mi (1,827.12 km) |
| Viseu to Ohringen | 1,032.09 mi (1,660.99 km) |
| Viseu to Olbernhau | 1,229.99 mi (1,979.48 km) |
| Viseu to Olching | 1,078.04 mi (1,734.94 km) |
| Viseu to Oldenburg | 1,144.90 mi (1,842.53 km) |
| Viseu to Oldenburg in Holstein | 1,279.64 mi (2,059.39 km) |
| Viseu to Olfen | 1,053.41 mi (1,695.31 km) |
| Viseu to Olpe | 1,038.12 mi (1,670.69 km) |
| Viseu to Olsberg | 1,074.47 mi (1,729.19 km) |
| Viseu to Oranienburg | 1,295.95 mi (2,085.62 km) |
| Viseu to Ortenberg | 1,055.61 mi (1,698.84 km) |
