| Clayton to Oerlinghausen | 454.21 mi (730.98 km) |
| Clayton to Oestrich-Winkel | 492.70 mi (792.93 km) |
| Clayton to Offenburg | 559.06 mi (899.71 km) |
| Clayton to Oftersheim | 539.77 mi (868.68 km) |
| Clayton to Ohrdruf | 567.04 mi (912.56 km) |
| Clayton to Ohringen | 579.58 mi (932.75 km) |
| Clayton to Olbernhau | 674.70 mi (1,085.82 km) |
| Clayton to Olching | 687.41 mi (1,106.28 km) |
| Clayton to Oldenburg | 414.47 mi (667.02 km) |
| Clayton to Oldenburg in Holstein | 515.68 mi (829.90 km) |
| Clayton to Olfen | 409.88 mi (659.64 km) |
| Clayton to Olpe | 448.84 mi (722.34 km) |
| Clayton to Olsberg | 463.42 mi (745.80 km) |
| Clayton to Oranienburg | 624.77 mi (1,005.46 km) |
| Clayton to Ortenberg | 518.04 mi (833.70 km) |
