| Cedar Rapids to Oerlinghausen | 4,395.23 mi (7,073.44 km) |
| Cedar Rapids to Oestrich-Winkel | 4,450.43 mi (7,162.27 km) |
| Cedar Rapids to Offenburg | 4,510.14 mi (7,258.37 km) |
| Cedar Rapids to Oftersheim | 4,497.11 mi (7,237.40 km) |
| Cedar Rapids to Ohrdruf | 4,513.54 mi (7,263.84 km) |
| Cedar Rapids to Ohringen | 4,537.28 mi (7,302.04 km) |
| Cedar Rapids to Olbernhau | 4,610.24 mi (7,419.47 km) |
| Cedar Rapids to Olching | 4,645.06 mi (7,475.50 km) |
| Cedar Rapids to Oldenburg | 4,333.11 mi (6,973.47 km) |
| Cedar Rapids to Oldenburg in Holstein | 4,376.49 mi (7,043.28 km) |
| Cedar Rapids to Olfen | 4,360.20 mi (7,017.06 km) |
| Cedar Rapids to Olpe | 4,403.77 mi (7,087.19 km) |
| Cedar Rapids to Olsberg | 4,413.46 mi (7,102.77 km) |
| Cedar Rapids to Oranienburg | 4,517.82 mi (7,270.73 km) |
| Cedar Rapids to Ortenberg | 4,473.85 mi (7,199.97 km) |
