| Lake Norman of Catawba to Oberkirch | 4,392.86 mi (7,069.63 km) |
| Lake Norman of Catawba to Obernburg am Main | 4,398.32 mi (7,078.42 km) |
| Lake Norman of Catawba to Obernkirchen | 4,328.40 mi (6,965.89 km) |
| Lake Norman of Catawba to Oberschleissheim | 4,545.15 mi (7,314.72 km) |
| Lake Norman of Catawba to Oberstdorf | 4,518.05 mi (7,271.10 km) |
| Lake Norman of Catawba to Obertraubling | 4,547.05 mi (7,317.77 km) |
| Lake Norman of Catawba to Obertshausen | 4,379.33 mi (7,047.85 km) |
| Lake Norman of Catawba to Oberursel | 4,365.09 mi (7,024.93 km) |
| Lake Norman of Catawba to Ochsenfurt | 4,441.29 mi (7,147.57 km) |
| Lake Norman of Catawba to Ochsenhausen | 4,483.94 mi (7,216.21 km) |
| Lake Norman of Catawba to Ochtrup | 4,255.03 mi (6,847.81 km) |
| Lake Norman of Catawba to Odenthal | 4,283.44 mi (6,893.53 km) |
| Lake Norman of Catawba to Oelde | 4,302.63 mi (6,924.41 km) |
| Lake Norman of Catawba to Oelsnitz | 4,501.80 mi (7,244.94 km) |
| Lake Norman of Catawba to Oer-Erkenschwick | 4,272.40 mi (6,875.76 km) |
