| Cave Spring to Oberkirch | 4,277.45 mi (6,883.89 km) |
| Cave Spring to Obernburg am Main | 4,281.58 mi (6,890.54 km) |
| Cave Spring to Obernkirchen | 4,209.86 mi (6,775.11 km) |
| Cave Spring to Oberschleissheim | 4,429.04 mi (7,127.85 km) |
| Cave Spring to Oberstdorf | 4,402.97 mi (7,085.90 km) |
| Cave Spring to Obertraubling | 4,430.23 mi (7,129.77 km) |
| Cave Spring to Obertshausen | 4,262.48 mi (6,859.81 km) |
| Cave Spring to Oberursel | 4,248.19 mi (6,836.81 km) |
| Cave Spring to Ochsenfurt | 4,324.48 mi (6,959.57 km) |
| Cave Spring to Ochsenhausen | 4,368.41 mi (7,030.27 km) |
| Cave Spring to Ochtrup | 4,136.90 mi (6,657.70 km) |
| Cave Spring to Odenthal | 4,166.22 mi (6,704.88 km) |
| Cave Spring to Oelde | 4,184.59 mi (6,734.44 km) |
| Cave Spring to Oelsnitz | 4,383.92 mi (7,055.24 km) |
| Cave Spring to Oer-Erkenschwick | 4,154.68 mi (6,686.31 km) |
