| Norristown to Oakley (California) | 2,463.09 mi (3,963.95 km) |
| Norristown to Oakton (Virginia) | 134.92 mi (217.13 km) |
| Norristown to Oakville (Missouri) | 808.43 mi (1,301.04 km) |
| Norristown to Oatfield (Oregon) | 2,389.53 mi (3,845.58 km) |
| Norristown to Ocala (Florida) | 848.85 mi (1,366.09 km) |
| Norristown to Ocean Acres (New Jersey) | 61.95 mi (99.69 km) |
| Norristown to Ocean City (New Jersey) | 70.88 mi (114.06 km) |
| Norristown to Ocean Pines (Maryland) | 120.48 mi (193.89 km) |
| Norristown to Ocean Pointe (Hawaii) | 4,908.46 mi (7,899.41 km) |
| Norristown to Ocean Springs (Mississippi) | 1,010.73 mi (1,626.61 km) |
| Norristown to Oceanside (California) | 2,351.59 mi (3,784.52 km) |
| Norristown to Oceanside (New York) | 96.34 mi (155.04 km) |
| Norristown to Ocoee (Florida) | 871.68 mi (1,402.83 km) |
| Norristown to Oconomowoc (Wisconsin) | 709.14 mi (1,141.26 km) |
| Norristown to Odenton (Maryland) | 102.59 mi (165.10 km) |
