| Merriam to Oerlinghausen | 4,652.69 mi (7,487.78 km) |
| Merriam to Oestrich-Winkel | 4,707.14 mi (7,575.42 km) |
| Merriam to Offenburg | 4,766.16 mi (7,670.40 km) |
| Merriam to Oftersheim | 4,753.68 mi (7,650.32 km) |
| Merriam to Ohrdruf | 4,770.95 mi (7,678.10 km) |
| Merriam to Ohringen | 4,793.96 mi (7,715.13 km) |
| Merriam to Olbernhau | 4,867.90 mi (7,834.12 km) |
| Merriam to Olching | 4,901.71 mi (7,888.53 km) |
| Merriam to Oldenburg | 4,590.80 mi (7,388.17 km) |
| Merriam to Oldenburg in Holstein | 4,634.45 mi (7,458.43 km) |
| Merriam to Olfen | 4,617.43 mi (7,431.03 km) |
| Merriam to Olpe | 4,660.84 mi (7,500.89 km) |
| Merriam to Olsberg | 4,670.72 mi (7,516.80 km) |
| Merriam to Oranienburg | 4,775.75 mi (7,685.83 km) |
| Merriam to Ortenberg | 4,730.88 mi (7,613.61 km) |
