| West Mifflin to Oskaloosa (Iowa) | 668.24 mi (1,075.43 km) |
| West Mifflin to Oswego (Illinois) | 448.68 mi (722.08 km) |
| West Mifflin to Oswego (New York) | 276.31 mi (444.67 km) |
| West Mifflin to Otsego (Minnesota) | 771.98 mi (1,242.39 km) |
| West Mifflin to Ottawa (Illinois) | 470.93 mi (757.89 km) |
| West Mifflin to Ottawa (Kansas) | 826.84 mi (1,330.67 km) |
| West Mifflin to Ottumwa (Iowa) | 656.50 mi (1,056.54 km) |
| West Mifflin to Overland (Missouri) | 568.86 mi (915.49 km) |
| West Mifflin to Overland Park (Kansas) | 792.17 mi (1,274.87 km) |
| West Mifflin to Overlea (Maryland) | 192.43 mi (309.69 km) |
| West Mifflin to Oviedo (Florida) | 811.65 mi (1,306.22 km) |
| West Mifflin to Owasso (Oklahoma) | 906.30 mi (1,458.55 km) |
| West Mifflin to Owatonna (Minnesota) | 727.83 mi (1,171.34 km) |
| West Mifflin to Owensboro (Kentucky) | 426.34 mi (686.12 km) |
| West Mifflin to Owings Mills (Maryland) | 177.67 mi (285.93 km) |
