| Ronkonkoma to Odenton (Maryland) | 223.96 mi (360.42 km) |
| Ronkonkoma to Odessa (Texas) | 1,729.24 mi (2,782.95 km) |
| Ronkonkoma to Ogden (Utah) | 2,008.12 mi (3,231.76 km) |
| Ronkonkoma to Oildale (California) | 2,494.20 mi (4,014.03 km) |
| Ronkonkoma to Ojus (Florida) | 1,102.26 mi (1,773.92 km) |
| Ronkonkoma to Okemos (Michigan) | 596.03 mi (959.22 km) |
| Ronkonkoma to Oklahoma City (Oklahoma) | 1,370.72 mi (2,205.96 km) |
| Ronkonkoma to Okmulgee (Oklahoma) | 1,288.79 mi (2,074.11 km) |
| Ronkonkoma to Olathe (Kansas) | 1,155.57 mi (1,859.70 km) |
| Ronkonkoma to Old Jamestown (Missouri) | 919.16 mi (1,479.25 km) |
| Ronkonkoma to Oldsmar (Florida) | 1,034.02 mi (1,664.09 km) |
| Ronkonkoma to Olean (New York) | 288.67 mi (464.57 km) |
| Ronkonkoma to Olive Branch (Mississippi) | 995.14 mi (1,601.53 km) |
| Ronkonkoma to Olivehurst (California) | 2,535.40 mi (4,080.33 km) |
| Ronkonkoma to Olney (Maryland) | 238.26 mi (383.44 km) |
