| Norristown to Odessa (Texas) | 1,605.60 mi (2,583.96 km) |
| Norristown to Ogden (Utah) | 1,906.63 mi (3,068.43 km) |
| Norristown to Oildale (California) | 2,383.88 mi (3,836.48 km) |
| Norristown to Ojus (Florida) | 1,017.39 mi (1,637.33 km) |
| Norristown to Okemos (Michigan) | 502.58 mi (808.82 km) |
| Norristown to Oklahoma City (Oklahoma) | 1,248.97 mi (2,010.02 km) |
| Norristown to Okmulgee (Oklahoma) | 1,166.50 mi (1,877.29 km) |
| Norristown to Olathe (Kansas) | 1,039.96 mi (1,673.65 km) |
| Norristown to Old Jamestown (Missouri) | 800.95 mi (1,289.00 km) |
| Norristown to Oldsmar (Florida) | 932.74 mi (1,501.10 km) |
| Norristown to Olean (New York) | 210.33 mi (338.49 km) |
| Norristown to Olive Branch (Mississippi) | 869.71 mi (1,399.66 km) |
| Norristown to Olivehurst (California) | 2,433.30 mi (3,916.02 km) |
| Norristown to Olney (Maryland) | 114.18 mi (183.76 km) |
| Norristown to Olympia (Washington) | 2,389.54 mi (3,845.60 km) |
