78664 is zip code located in Round Rock, Texas. The population is 54,864, making 78664 the largest zipcode in Round Rock and the 4th largest in Travis County.
There are 21 public schools in 78664 with an average Homefacts rating of B. The total crime rate for Round Rock is very low , and there are 38 registered sex offenders residing in the zip code 78664. Unemployment in 78664 is low.