| Centereach to Olympia Heights (Florida) | 1,126.08 mi (1,812.26 km) |
| Centereach to Omaha (Nebraska) | 1,193.45 mi (1,920.67 km) |
| Centereach to On Top of the World Designated Place (Florida) | 964.06 mi (1,551.50 km) |
| Centereach to Onalaska (Wisconsin) | 946.28 mi (1,522.89 km) |
| Centereach to Oneida (New York) | 202.11 mi (325.26 km) |
| Centereach to Oneonta (New York) | 150.05 mi (241.48 km) |
| Centereach to Ontario (California) | 2,460.20 mi (3,959.31 km) |
| Centereach to Ontario (Oregon) | 2,221.97 mi (3,575.92 km) |
| Centereach to Opa-locka (Florida) | 1,112.90 mi (1,791.04 km) |
| Centereach to Opelika (Alabama) | 884.25 mi (1,423.06 km) |
| Centereach to Opelousas (Louisiana) | 1,278.98 mi (2,058.32 km) |
| Centereach to Orange (California) | 2,478.20 mi (3,988.27 km) |
| Centereach to Orange (Texas) | 1,374.52 mi (2,212.08 km) |
| Centereach to Orange City (Florida) | 945.51 mi (1,521.66 km) |
| Centereach to Orangeburg (South Carolina) | 665.24 mi (1,070.60 km) |
