| Norristown to Oak Harbor (Washington) | 2,369.48 mi (3,813.31 km) |
| Norristown to Oak Hills (Oregon) | 2,400.10 mi (3,862.59 km) |
| Norristown to Oak Lawn (Illinois) | 656.74 mi (1,056.92 km) |
| Norristown to Oak Park (California) | 2,402.20 mi (3,865.97 km) |
| Norristown to Oak Park (Illinois) | 659.89 mi (1,062.00 km) |
| Norristown to Oak Park (Michigan) | 437.90 mi (704.73 km) |
| Norristown to Oak Ridge (Florida) | 875.90 mi (1,409.62 km) |
| Norristown to Oak Ridge (New Jersey) | 76.86 mi (123.69 km) |
| Norristown to Oak Ridge (Tennessee) | 565.21 mi (909.63 km) |
| Norristown to Oakdale (California) | 2,424.19 mi (3,901.36 km) |
| Norristown to Oakdale (Minnesota) | 955.51 mi (1,537.74 km) |
| Norristown to Oakland (California) | 2,494.49 mi (4,014.49 km) |
| Norristown to Oakland (New Jersey) | 85.26 mi (137.21 km) |
| Norristown to Oakland Park (Florida) | 1,002.45 mi (1,613.29 km) |
| Norristown to Oakleaf Plantation (Florida) | 778.90 mi (1,253.52 km) |
