| Ithaca to Oerlinghausen | 3,818.12 mi (6,144.68 km) |
| Ithaca to Oestrich-Winkel | 3,853.80 mi (6,202.10 km) |
| Ithaca to Offenburg | 3,900.50 mi (6,277.25 km) |
| Ithaca to Oftersheim | 3,897.15 mi (6,271.86 km) |
| Ithaca to Ohrdruf | 3,933.43 mi (6,330.24 km) |
| Ithaca to Ohringen | 3,939.05 mi (6,339.30 km) |
| Ithaca to Olbernhau | 4,038.10 mi (6,498.70 km) |
| Ithaca to Olching | 4,045.15 mi (6,510.04 km) |
| Ithaca to Oldenburg | 3,765.36 mi (6,059.77 km) |
| Ithaca to Oldenburg in Holstein | 3,828.52 mi (6,161.41 km) |
| Ithaca to Olfen | 3,776.60 mi (6,077.85 km) |
| Ithaca to Olpe | 3,815.41 mi (6,140.31 km) |
| Ithaca to Olsberg | 3,830.21 mi (6,164.13 km) |
| Ithaca to Oranienburg | 3,963.67 mi (6,378.91 km) |
| Ithaca to Ortenberg | 3,883.85 mi (6,250.45 km) |
