| Norristown to Orangevale (California) | 2,423.95 mi (3,900.97 km) |
| Norristown to Orchards (Washington) | 2,383.78 mi (3,836.33 km) |
| Norristown to Orcutt (California) | 2,471.23 mi (3,977.05 km) |
| Norristown to Oregon (Ohio) | 435.53 mi (700.91 km) |
| Norristown to Oregon (Wisconsin) | 751.11 mi (1,208.79 km) |
| Norristown to Oregon City (Oregon) | 2,390.17 mi (3,846.61 km) |
| Norristown to Orem (Utah) | 1,904.85 mi (3,065.56 km) |
| Norristown to Orinda (California) | 2,490.55 mi (4,008.15 km) |
| Norristown to Orland Park (Illinois) | 661.69 mi (1,064.89 km) |
| Norristown to Orlando (Florida) | 873.82 mi (1,406.28 km) |
| Norristown to Ormond Beach (Florida) | 815.83 mi (1,312.96 km) |
| Norristown to Oro Valley (Arizona) | 2,040.33 mi (3,283.60 km) |
| Norristown to Oroville (California) | 2,425.39 mi (3,903.29 km) |
| Norristown to Oshkosh (Wisconsin) | 728.66 mi (1,172.67 km) |
| Norristown to Oskaloosa (Iowa) | 908.22 mi (1,461.64 km) |
