| Piedmont to Oerlinghausen | 5,564.72 mi (8,955.55 km) |
| Piedmont to Oestrich-Winkel | 5,655.07 mi (9,100.96 km) |
| Piedmont to Offenburg | 5,737.30 mi (9,233.29 km) |
| Piedmont to Oftersheim | 5,705.50 mi (9,182.12 km) |
| Piedmont to Ohrdruf | 5,680.92 mi (9,142.55 km) |
| Piedmont to Ohringen | 5,739.63 mi (9,237.04 km) |
| Piedmont to Olbernhau | 5,754.90 mi (9,261.62 km) |
| Piedmont to Olching | 5,844.11 mi (9,405.19 km) |
| Piedmont to Oldenburg | 5,488.60 mi (8,833.04 km) |
| Piedmont to Oldenburg in Holstein | 5,490.03 mi (8,835.36 km) |
| Piedmont to Olfen | 5,544.89 mi (8,923.64 km) |
| Piedmont to Olpe | 5,594.97 mi (9,004.24 km) |
| Piedmont to Olsberg | 5,593.86 mi (9,002.45 km) |
| Piedmont to Oranienburg | 5,632.94 mi (9,065.34 km) |
| Piedmont to Ortenberg | 5,663.71 mi (9,114.85 km) |
