| Ithaca to Oberkirch | 3,904.38 mi (6,283.49 km) |
| Ithaca to Obernburg am Main | 3,903.90 mi (6,282.72 km) |
| Ithaca to Obernkirchen | 3,825.99 mi (6,157.33 km) |
| Ithaca to Oberschleissheim | 4,053.35 mi (6,523.24 km) |
| Ithaca to Oberstdorf | 4,030.90 mi (6,487.10 km) |
| Ithaca to Obertraubling | 4,052.10 mi (6,521.23 km) |
| Ithaca to Obertshausen | 3,884.46 mi (6,251.44 km) |
| Ithaca to Oberursel | 3,870.02 mi (6,228.20 km) |
| Ithaca to Ochsenfurt | 3,946.48 mi (6,351.25 km) |
| Ithaca to Ochsenhausen | 3,994.81 mi (6,429.02 km) |
| Ithaca to Ochtrup | 3,754.55 mi (6,042.37 km) |
| Ithaca to Odenthal | 3,787.01 mi (6,094.60 km) |
| Ithaca to Oelde | 3,802.49 mi (6,119.52 km) |
| Ithaca to Oelsnitz | 4,002.19 mi (6,440.90 km) |
| Ithaca to Oer-Erkenschwick | 3,773.74 mi (6,073.25 km) |
