| Philadelphia to Oak Grove (South Carolina) | 532.32 mi (856.68 km) |
| Philadelphia to Oak Harbor (Washington) | 2,382.87 mi (3,834.86 km) |
| Philadelphia to Oak Hills (Oregon) | 2,413.32 mi (3,883.87 km) |
| Philadelphia to Oak Lawn (Illinois) | 669.22 mi (1,077.00 km) |
| Philadelphia to Oak Park (California) | 2,413.66 mi (3,884.42 km) |
| Philadelphia to Oak Park (Illinois) | 672.46 mi (1,082.22 km) |
| Philadelphia to Oak Park (Michigan) | 451.10 mi (725.97 km) |
| Philadelphia to Oak Ridge (Florida) | 873.44 mi (1,405.67 km) |
| Philadelphia to Oak Ridge (New Jersey) | 78.30 mi (126.00 km) |
| Philadelphia to Oak Ridge (Tennessee) | 571.31 mi (919.43 km) |
| Philadelphia to Oakdale (California) | 2,436.42 mi (3,921.04 km) |
| Philadelphia to Oakdale (Minnesota) | 968.79 mi (1,559.12 km) |
| Philadelphia to Oakland (California) | 2,506.78 mi (4,034.27 km) |
| Philadelphia to Oakland (New Jersey) | 84.87 mi (136.58 km) |
| Philadelphia to Oakland Park (Florida) | 998.25 mi (1,606.53 km) |
