| Richardson to Oerlinghausen | 5,046.98 mi (8,122.34 km) |
| Richardson to Oestrich-Winkel | 5,095.04 mi (8,199.67 km) |
| Richardson to Offenburg | 5,149.37 mi (8,287.10 km) |
| Richardson to Oftersheim | 5,140.48 mi (8,272.80 km) |
| Richardson to Ohrdruf | 5,164.55 mi (8,311.54 km) |
| Richardson to Ohringen | 5,181.46 mi (8,338.75 km) |
| Richardson to Olbernhau | 5,264.22 mi (8,471.95 km) |
| Richardson to Olching | 5,288.80 mi (8,511.51 km) |
| Richardson to Oldenburg | 4,987.81 mi (8,027.10 km) |
| Richardson to Oldenburg in Holstein | 5,037.12 mi (8,106.46 km) |
| Richardson to Olfen | 5,009.56 mi (8,062.11 km) |
| Richardson to Olpe | 5,051.49 mi (8,129.58 km) |
| Richardson to Olsberg | 5,063.09 mi (8,148.26 km) |
| Richardson to Oranienburg | 5,177.10 mi (8,331.74 km) |
| Richardson to Ortenberg | 5,121.12 mi (8,241.65 km) |
