| Knoxville to Oberkirch | 4,497.63 mi (7,238.24 km) |
| Knoxville to Obernburg am Main | 4,499.29 mi (7,240.90 km) |
| Knoxville to Obernkirchen | 4,423.56 mi (7,119.03 km) |
| Knoxville to Oberschleissheim | 4,647.90 mi (7,480.07 km) |
| Knoxville to Oberstdorf | 4,623.68 mi (7,441.10 km) |
| Knoxville to Obertraubling | 4,647.71 mi (7,479.77 km) |
| Knoxville to Obertshausen | 4,479.99 mi (7,209.84 km) |
| Knoxville to Oberursel | 4,465.61 mi (7,186.70 km) |
| Knoxville to Ochsenfurt | 4,542.01 mi (7,309.66 km) |
| Knoxville to Ochsenhausen | 4,588.35 mi (7,384.23 km) |
| Knoxville to Ochtrup | 4,351.65 mi (7,003.31 km) |
| Knoxville to Odenthal | 4,382.99 mi (7,053.74 km) |
| Knoxville to Oelde | 4,399.52 mi (7,080.34 km) |
| Knoxville to Oelsnitz | 4,599.13 mi (7,401.59 km) |
| Knoxville to Oer-Erkenschwick | 4,370.37 mi (7,033.43 km) |
