| Casper to Oerlinghausen | 4,825.00 mi (7,765.09 km) |
| Casper to Oestrich-Winkel | 4,900.52 mi (7,886.63 km) |
| Casper to Offenburg | 4,973.54 mi (8,004.14 km) |
| Casper to Oftersheim | 4,949.81 mi (7,965.95 km) |
| Casper to Ohrdruf | 4,943.50 mi (7,955.79 km) |
| Casper to Ohringen | 4,987.02 mi (8,025.83 km) |
| Casper to Olbernhau | 5,028.76 mi (8,093.00 km) |
| Casper to Olching | 5,094.10 mi (8,198.16 km) |
| Casper to Oldenburg | 4,754.33 mi (7,651.35 km) |
| Casper to Oldenburg in Holstein | 4,774.96 mi (7,684.55 km) |
| Casper to Olfen | 4,798.08 mi (7,721.77 km) |
| Casper to Olpe | 4,845.80 mi (7,798.56 km) |
| Casper to Olsberg | 4,849.54 mi (7,804.58 km) |
| Casper to Oranienburg | 4,918.96 mi (7,916.30 km) |
| Casper to Ortenberg | 4,915.90 mi (7,911.38 km) |
