| Houghton le Spring to Oerlinghausen | 461.72 mi (743.07 km) |
| Houghton le Spring to Oestrich-Winkel | 519.85 mi (836.61 km) |
| Houghton le Spring to Offenburg | 595.97 mi (959.13 km) |
| Houghton le Spring to Oftersheim | 568.98 mi (915.69 km) |
| Houghton le Spring to Ohrdruf | 578.75 mi (931.40 km) |
| Houghton le Spring to Ohringen | 606.57 mi (976.19 km) |
| Houghton le Spring to Olbernhau | 681.10 mi (1,096.13 km) |
| Houghton le Spring to Olching | 714.10 mi (1,149.23 km) |
| Houghton le Spring to Oldenburg | 410.00 mi (659.82 km) |
| Houghton le Spring to Oldenburg in Holstein | 495.47 mi (797.39 km) |
| Houghton le Spring to Olfen | 424.18 mi (682.65 km) |
| Houghton le Spring to Olpe | 468.34 mi (753.71 km) |
| Houghton le Spring to Olsberg | 477.53 mi (768.51 km) |
| Houghton le Spring to Oranienburg | 615.91 mi (991.21 km) |
| Houghton le Spring to Ortenberg | 538.63 mi (866.84 km) |
