| South Portland to Nowy Dwor Mazowiecki | 3,964.01 mi (6,379.46 km) |
| South Portland to Nowy Sacz | 4,064.74 mi (6,541.57 km) |
| South Portland to Nowy Targ | 4,044.67 mi (6,509.27 km) |
| South Portland to Nowy Tomysl | 3,799.62 mi (6,114.90 km) |
| South Portland to Nysa | 3,906.73 mi (6,287.28 km) |
| South Portland to Oborniki | 3,814.07 mi (6,138.15 km) |
| South Portland to Oborniki Slaskie | 3,862.16 mi (6,215.54 km) |
| South Portland to Olawa | 3,889.60 mi (6,259.70 km) |
| South Portland to Olecko | 3,970.62 mi (6,390.09 km) |
| South Portland to Olesnica | 3,883.65 mi (6,250.13 km) |
| South Portland to Olesno | 3,933.76 mi (6,330.78 km) |
| South Portland to Olkusz | 3,998.04 mi (6,434.23 km) |
| South Portland to Olsztyn | 3,908.62 mi (6,290.31 km) |
| South Portland to Opalenica | 3,810.34 mi (6,132.16 km) |
| South Portland to Opoczno | 3,985.80 mi (6,414.52 km) |
