| Madeley to Olympia Heights (Florida) | 4,327.63 mi (6,964.65 km) |
| Madeley to Omaha (Nebraska) | 4,166.13 mi (6,704.73 km) |
| Madeley to On Top of the World Designated Place (Florida) | 4,235.72 mi (6,816.73 km) |
| Madeley to Onalaska (Wisconsin) | 3,863.11 mi (6,217.08 km) |
| Madeley to Oneida (New York) | 3,307.30 mi (5,322.58 km) |
| Madeley to Oneonta (New York) | 3,310.46 mi (5,327.67 km) |
| Madeley to Ontario (California) | 5,295.11 mi (8,521.66 km) |
| Madeley to Ontario (Oregon) | 4,712.74 mi (7,584.43 km) |
| Madeley to Opa-locka (Florida) | 4,315.12 mi (6,944.52 km) |
| Madeley to Opelika (Alabama) | 4,182.86 mi (6,731.66 km) |
| Madeley to Opelousas (Louisiana) | 4,558.85 mi (7,336.76 km) |
| Madeley to Orange (California) | 5,315.52 mi (8,554.50 km) |
| Madeley to Orange (Texas) | 4,645.93 mi (7,476.90 km) |
| Madeley to Orange City (Florida) | 4,203.26 mi (6,764.49 km) |
| Madeley to Orangeburg (South Carolina) | 3,959.24 mi (6,371.78 km) |
