| West Mifflin to Olympia (Washington) | 2,167.86 mi (3,488.83 km) |
| West Mifflin to Olympia Heights (Florida) | 1,011.42 mi (1,627.73 km) |
| West Mifflin to Omaha (Nebraska) | 845.42 mi (1,360.58 km) |
| West Mifflin to On Top of the World Designated Place (Florida) | 789.02 mi (1,269.80 km) |
| West Mifflin to Onalaska (Wisconsin) | 627.69 mi (1,010.17 km) |
| West Mifflin to Oneida (New York) | 288.41 mi (464.15 km) |
| West Mifflin to Oneonta (New York) | 289.62 mi (466.10 km) |
| West Mifflin to Ontario (California) | 2,103.67 mi (3,385.53 km) |
| West Mifflin to Ontario (Oregon) | 1,898.21 mi (3,054.87 km) |
| West Mifflin to Opa-locka (Florida) | 999.18 mi (1,608.02 km) |
| West Mifflin to Opelika (Alabama) | 612.12 mi (985.11 km) |
| West Mifflin to Opelousas (Louisiana) | 963.17 mi (1,550.07 km) |
| West Mifflin to Orange (California) | 2,121.45 mi (3,414.14 km) |
| West Mifflin to Orange (Texas) | 1,051.77 mi (1,692.67 km) |
| West Mifflin to Orange City (Florida) | 793.13 mi (1,276.43 km) |
