| Round Rock to Jacksonville (North Carolina) | 1,212.39 mi (1,951.15 km) |
| Round Rock to Jacksonville (Texas) | 173.20 mi (278.74 km) |
| Round Rock to Jacksonville Beach (Florida) | 968.27 mi (1,558.28 km) |
| Round Rock to James Island (South Carolina) | 1,052.56 mi (1,693.93 km) |
| Round Rock to Jamestown (New York) | 1,295.81 mi (2,085.40 km) |
| Round Rock to Jamestown (North Dakota) | 1,133.03 mi (1,823.44 km) |
| Round Rock to Janesville (Wisconsin) | 966.16 mi (1,554.89 km) |
| Round Rock to Jasmine Estates (Florida) | 913.64 mi (1,470.36 km) |
| Round Rock to Jasper (Alabama) | 649.27 mi (1,044.90 km) |
| Round Rock to Jasper (Indiana) | 816.62 mi (1,314.23 km) |
| Round Rock to Jefferson (Georgia) | 857.17 mi (1,379.48 km) |
| Round Rock to Jefferson (Louisiana) | 449.81 mi (723.90 km) |
| Round Rock to Jefferson City (Missouri) | 637.01 mi (1,025.16 km) |
| Round Rock to Jefferson Hills (Pennsylvania) | 1,201.46 mi (1,933.56 km) |
| Round Rock to Jefferson Valley-Yorktown (New York) | 1,521.89 mi (2,449.24 km) |
