| Ronkonkoma to Jeffersontown (Kentucky) | 686.67 mi (1,105.09 km) |
| Ronkonkoma to Jeffersonville (Indiana) | 690.55 mi (1,111.33 km) |
| Ronkonkoma to Jenison (Michigan) | 668.94 mi (1,076.56 km) |
| Ronkonkoma to Jenks (Oklahoma) | 1,276.89 mi (2,054.96 km) |
| Ronkonkoma to Jennings (Missouri) | 920.07 mi (1,480.71 km) |
| Ronkonkoma to Jensen Beach (Florida) | 1,020.79 mi (1,642.81 km) |
| Ronkonkoma to Jericho (New York) | 21.84 mi (35.15 km) |
| Ronkonkoma to Jerome (Idaho) | 2,115.94 mi (3,405.27 km) |
| Ronkonkoma to Jersey City (New Jersey) | 49.75 mi (80.07 km) |
| Ronkonkoma to Jessup (Maryland) | 224.64 mi (361.52 km) |
| Ronkonkoma to Johns Creek (Georgia) | 766.01 mi (1,232.78 km) |
| Ronkonkoma to Johnson City (New York) | 172.90 mi (278.25 km) |
| Ronkonkoma to Johnson City (Tennessee) | 586.95 mi (944.61 km) |
| Ronkonkoma to Johnston (Iowa) | 1,069.29 mi (1,720.86 km) |
| Ronkonkoma to Johnstown (Colorado) | 1,661.11 mi (2,673.30 km) |
