| Ronkonkoma to Olympia (Washington) | 2,471.33 mi (3,977.22 km) |
| Ronkonkoma to Olympia Heights (Florida) | 1,121.12 mi (1,804.26 km) |
| Ronkonkoma to Omaha (Nebraska) | 1,191.95 mi (1,918.26 km) |
| Ronkonkoma to On Top of the World Designated Place (Florida) | 959.14 mi (1,543.59 km) |
| Ronkonkoma to Onalaska (Wisconsin) | 945.62 mi (1,521.82 km) |
| Ronkonkoma to Oneida (New York) | 204.13 mi (328.51 km) |
| Ronkonkoma to Oneonta (New York) | 151.90 mi (244.47 km) |
| Ronkonkoma to Ontario (California) | 2,458.27 mi (3,956.20 km) |
| Ronkonkoma to Ontario (Oregon) | 2,221.45 mi (3,575.09 km) |
| Ronkonkoma to Opa-locka (Florida) | 1,107.93 mi (1,783.04 km) |
| Ronkonkoma to Opelika (Alabama) | 879.84 mi (1,415.96 km) |
| Ronkonkoma to Opelousas (Louisiana) | 1,274.94 mi (2,051.81 km) |
| Ronkonkoma to Orange (California) | 2,476.24 mi (3,985.13 km) |
| Ronkonkoma to Orange (Texas) | 1,370.57 mi (2,205.71 km) |
| Ronkonkoma to Orange City (Florida) | 940.56 mi (1,513.69 km) |
