| South Plainfield to Olympia (Washington) | 2,418.38 mi (3,892.01 km) |
| South Plainfield to Olympia Heights (Florida) | 1,081.09 mi (1,739.84 km) |
| South Plainfield to Omaha (Nebraska) | 1,127.77 mi (1,814.98 km) |
| South Plainfield to On Top of the World Designated Place (Florida) | 908.55 mi (1,462.16 km) |
| South Plainfield to Onalaska (Wisconsin) | 887.31 mi (1,427.99 km) |
| South Plainfield to Oneida (New York) | 184.41 mi (296.78 km) |
| South Plainfield to Oneonta (New York) | 134.21 mi (216.00 km) |
| South Plainfield to Ontario (California) | 2,391.73 mi (3,849.12 km) |
| South Plainfield to Ontario (Oregon) | 2,163.75 mi (3,482.21 km) |
| South Plainfield to Opa-locka (Florida) | 1,067.96 mi (1,718.71 km) |
| South Plainfield to Opelika (Alabama) | 816.42 mi (1,313.90 km) |
| South Plainfield to Opelousas (Louisiana) | 1,208.03 mi (1,944.14 km) |
| South Plainfield to Orange (California) | 2,409.62 mi (3,877.91 km) |
| South Plainfield to Orange (Texas) | 1,303.09 mi (2,097.12 km) |
| South Plainfield to Orange City (Florida) | 893.13 mi (1,437.36 km) |
