| Northport to Olympia Heights (Florida) | 679.03 mi (1,092.79 km) |
| Northport to Omaha (Nebraska) | 721.69 mi (1,161.45 km) |
| Northport to On Top of the World Designated Place (Florida) | 425.25 mi (684.38 km) |
| Northport to Onalaska (Wisconsin) | 759.65 mi (1,222.54 km) |
| Northport to Oneida (New York) | 936.56 mi (1,507.25 km) |
| Northport to Oneonta (New York) | 931.48 mi (1,499.07 km) |
| Northport to Ontario (California) | 1,720.55 mi (2,768.96 km) |
| Northport to Ontario (Oregon) | 1,738.79 mi (2,798.31 km) |
| Northport to Opa-locka (Florida) | 672.81 mi (1,082.79 km) |
| Northport to Opelika (Alabama) | 135.29 mi (217.72 km) |
| Northport to Opelousas (Louisiana) | 323.68 mi (520.92 km) |
| Northport to Orange (California) | 1,734.79 mi (2,791.88 km) |
| Northport to Orange (Texas) | 421.97 mi (679.10 km) |
| Northport to Orange City (Florida) | 478.02 mi (769.29 km) |
| Northport to Orangeburg (South Carolina) | 388.71 mi (625.56 km) |
