| Gastonia to Oberkirch | 4,417.55 mi (7,109.36 km) |
| Gastonia to Obernburg am Main | 4,423.29 mi (7,118.61 km) |
| Gastonia to Obernkirchen | 4,353.76 mi (7,006.70 km) |
| Gastonia to Oberschleissheim | 4,569.99 mi (7,354.68 km) |
| Gastonia to Oberstdorf | 4,542.67 mi (7,310.72 km) |
| Gastonia to Obertraubling | 4,572.04 mi (7,357.98 km) |
| Gastonia to Obertshausen | 4,404.33 mi (7,088.08 km) |
| Gastonia to Oberursel | 4,390.09 mi (7,065.17 km) |
| Gastonia to Ochsenfurt | 4,466.28 mi (7,187.78 km) |
| Gastonia to Ochsenhausen | 4,508.65 mi (7,255.97 km) |
| Gastonia to Ochtrup | 4,280.30 mi (6,888.48 km) |
| Gastonia to Odenthal | 4,308.51 mi (6,933.88 km) |
| Gastonia to Oelde | 4,327.88 mi (6,965.05 km) |
| Gastonia to Oelsnitz | 4,527.01 mi (7,285.52 km) |
| Gastonia to Oer-Erkenschwick | 4,297.58 mi (6,916.28 km) |
