| Ronkonkoma to Johnstown (Pennsylvania) | 305.89 mi (492.28 km) |
| Ronkonkoma to Joliet (Illinois) | 782.15 mi (1,258.75 km) |
| Ronkonkoma to Jonesboro (Arkansas) | 1,009.88 mi (1,625.24 km) |
| Ronkonkoma to Joplin (Missouri) | 1,174.19 mi (1,889.67 km) |
| Ronkonkoma to Joppatowne (Maryland) | 195.54 mi (314.69 km) |
| Ronkonkoma to Juana Díaz (Puerto Rico) | 1,620.33 mi (2,607.66 km) |
| Ronkonkoma to Junction City (Kansas) | 1,259.44 mi (2,026.88 km) |
| Ronkonkoma to Juneau (Alaska) | 2,869.50 mi (4,618.02 km) |
| Ronkonkoma to Jupiter (Florida) | 1,038.77 mi (1,671.73 km) |
| Ronkonkoma to Jupiter Farms (Florida) | 1,040.96 mi (1,675.26 km) |
| Ronkonkoma to Jurupa Valley (California) | 2,452.27 mi (3,946.55 km) |
| Ronkonkoma to Justice (Illinois) | 765.67 mi (1,232.23 km) |
| Ronkonkoma to Kahului (Hawaii) | 4,950.22 mi (7,966.62 km) |
| Ronkonkoma to Kailua (Hawaii) | 4,993.53 mi (8,036.30 km) |
| Ronkonkoma to Kalamazoo (Michigan) | 651.93 mi (1,049.17 km) |
