| Ronkonkoma to Oskaloosa (Iowa) | 1,015.34 mi (1,634.03 km) |
| Ronkonkoma to Oswego (Illinois) | 791.63 mi (1,274.00 km) |
| Ronkonkoma to Oswego (New York) | 251.74 mi (405.14 km) |
| Ronkonkoma to Otsego (Minnesota) | 1,076.64 mi (1,732.68 km) |
| Ronkonkoma to Ottawa (Illinois) | 817.54 mi (1,315.71 km) |
| Ronkonkoma to Ottawa (Kansas) | 1,183.49 mi (1,904.65 km) |
| Ronkonkoma to Ottumwa (Iowa) | 1,005.50 mi (1,618.19 km) |
| Ronkonkoma to Overland (Missouri) | 925.98 mi (1,490.23 km) |
| Ronkonkoma to Overland Park (Kansas) | 1,148.55 mi (1,848.41 km) |
| Ronkonkoma to Overlea (Maryland) | 205.07 mi (330.03 km) |
| Ronkonkoma to Oviedo (Florida) | 954.88 mi (1,536.74 km) |
| Ronkonkoma to Owasso (Oklahoma) | 1,262.13 mi (2,031.21 km) |
| Ronkonkoma to Owatonna (Minnesota) | 1,047.14 mi (1,685.20 km) |
| Ronkonkoma to Owensboro (Kentucky) | 776.41 mi (1,249.51 km) |
| Ronkonkoma to Owings Mills (Maryland) | 216.30 mi (348.11 km) |
