| Mexborough to Olympia Heights (Florida) | 4,367.76 mi (7,029.22 km) |
| Mexborough to Omaha (Nebraska) | 4,177.67 mi (6,723.31 km) |
| Mexborough to On Top of the World Designated Place (Florida) | 4,271.18 mi (6,873.80 km) |
| Mexborough to Onalaska (Wisconsin) | 3,875.70 mi (6,237.33 km) |
| Mexborough to Oneida (New York) | 3,333.09 mi (5,364.09 km) |
| Mexborough to Oneonta (New York) | 3,337.53 mi (5,371.23 km) |
| Mexborough to Ontario (California) | 5,294.01 mi (8,519.89 km) |
| Mexborough to Ontario (Oregon) | 4,704.21 mi (7,570.70 km) |
| Mexborough to Opa-locka (Florida) | 4,355.17 mi (7,008.97 km) |
| Mexborough to Opelika (Alabama) | 4,212.28 mi (6,779.01 km) |
| Mexborough to Opelousas (Louisiana) | 4,584.35 mi (7,377.79 km) |
| Mexborough to Orange (California) | 5,314.39 mi (8,552.68 km) |
| Mexborough to Orange (Texas) | 4,670.28 mi (7,516.09 km) |
| Mexborough to Orange City (Florida) | 4,239.74 mi (6,823.20 km) |
| Mexborough to Orangeburg (South Carolina) | 3,991.73 mi (6,424.07 km) |
