| Lake Norman of Catawba to Oerlinghausen | 4,319.18 mi (6,951.04 km) |
| Lake Norman of Catawba to Oestrich-Winkel | 4,347.53 mi (6,996.67 km) |
| Lake Norman of Catawba to Offenburg | 4,388.56 mi (7,062.70 km) |
| Lake Norman of Catawba to Oftersheim | 4,389.29 mi (7,063.89 km) |
| Lake Norman of Catawba to Ohrdruf | 4,432.84 mi (7,133.97 km) |
| Lake Norman of Catawba to Ohringen | 4,431.66 mi (7,132.06 km) |
| Lake Norman of Catawba to Olbernhau | 4,539.70 mi (7,305.93 km) |
| Lake Norman of Catawba to Olching | 4,536.46 mi (7,300.73 km) |
| Lake Norman of Catawba to Oldenburg | 4,269.73 mi (6,871.46 km) |
| Lake Norman of Catawba to Oldenburg in Holstein | 4,338.31 mi (6,981.84 km) |
| Lake Norman of Catawba to Olfen | 4,275.63 mi (6,880.96 km) |
| Lake Norman of Catawba to Olpe | 4,312.50 mi (6,940.30 km) |
| Lake Norman of Catawba to Olsberg | 4,329.07 mi (6,966.97 km) |
| Lake Norman of Catawba to Oranienburg | 4,471.15 mi (7,195.62 km) |
| Lake Norman of Catawba to Ortenberg | 4,379.95 mi (7,048.86 km) |
