| Clarksville to Oerlinghausen | 4,513.45 mi (7,263.70 km) |
| Clarksville to Oestrich-Winkel | 4,553.17 mi (7,327.63 km) |
| Clarksville to Offenburg | 4,602.09 mi (7,406.34 km) |
| Clarksville to Oftersheim | 4,597.18 mi (7,398.44 km) |
| Clarksville to Ohrdruf | 4,629.65 mi (7,450.70 km) |
| Clarksville to Ohringen | 4,638.84 mi (7,465.49 km) |
| Clarksville to Olbernhau | 4,732.74 mi (7,616.61 km) |
| Clarksville to Olching | 4,745.38 mi (7,636.95 km) |
| Clarksville to Oldenburg | 4,458.38 mi (7,175.07 km) |
| Clarksville to Oldenburg in Holstein | 4,516.49 mi (7,268.58 km) |
| Clarksville to Olfen | 4,473.27 mi (7,199.03 km) |
| Clarksville to Olpe | 4,513.14 mi (7,263.19 km) |
| Clarksville to Olsberg | 4,526.91 mi (7,285.36 km) |
| Clarksville to Oranienburg | 4,653.67 mi (7,489.36 km) |
| Clarksville to Ortenberg | 4,582.02 mi (7,374.05 km) |
