| Lake Monticello to Oberkirch | 4,176.57 mi (6,721.54 km) |
| Lake Monticello to Obernburg am Main | 4,181.45 mi (6,729.40 km) |
| Lake Monticello to Obernkirchen | 4,111.01 mi (6,616.03 km) |
| Lake Monticello to Oberschleissheim | 4,328.54 mi (6,966.11 km) |
| Lake Monticello to Oberstdorf | 4,301.93 mi (6,923.29 km) |
| Lake Monticello to Obertraubling | 4,330.15 mi (6,968.71 km) |
| Lake Monticello to Obertshausen | 4,162.42 mi (6,698.77 km) |
| Lake Monticello to Oberursel | 4,148.16 mi (6,675.82 km) |
| Lake Monticello to Ochsenfurt | 4,224.40 mi (6,798.51 km) |
| Lake Monticello to Ochsenhausen | 4,267.59 mi (6,868.03 km) |
| Lake Monticello to Ochtrup | 4,037.73 mi (6,498.10 km) |
| Lake Monticello to Odenthal | 4,066.39 mi (6,544.23 km) |
| Lake Monticello to Oelde | 4,085.35 mi (6,574.73 km) |
| Lake Monticello to Oelsnitz | 4,284.56 mi (6,895.33 km) |
| Lake Monticello to Oer-Erkenschwick | 4,055.20 mi (6,526.21 km) |
