| Ronkonkoma to Jacksonville (North Carolina) | 480.00 mi (772.49 km) |
| Ronkonkoma to Jacksonville (Texas) | 1,369.18 mi (2,203.48 km) |
| Ronkonkoma to Jacksonville Beach (Florida) | 862.50 mi (1,388.06 km) |
| Ronkonkoma to James Island (South Carolina) | 672.57 mi (1,082.40 km) |
| Ronkonkoma to Jamestown (New York) | 328.83 mi (529.20 km) |
| Ronkonkoma to Jamestown (North Dakota) | 1,334.87 mi (2,148.26 km) |
| Ronkonkoma to Janesville (Wisconsin) | 828.08 mi (1,332.67 km) |
| Ronkonkoma to Jasmine Estates (Florida) | 1,020.04 mi (1,641.59 km) |
| Ronkonkoma to Jasper (Alabama) | 911.98 mi (1,467.69 km) |
| Ronkonkoma to Jasper (Indiana) | 753.27 mi (1,212.27 km) |
| Ronkonkoma to Jefferson (Georgia) | 735.46 mi (1,183.61 km) |
| Ronkonkoma to Jefferson (Louisiana) | 1,213.45 mi (1,952.86 km) |
| Ronkonkoma to Jefferson City (Missouri) | 1,022.61 mi (1,645.73 km) |
| Ronkonkoma to Jefferson Hills (Pennsylvania) | 359.09 mi (577.90 km) |
| Ronkonkoma to Jefferson Valley-Yorktown (New York) | 50.04 mi (80.53 km) |
