Round Rock, TX zip codes
Round Rock, Texas has 6 zip codes (3 residential, 3 PO box or single-organization). Most of it is in Williamson County. Together these zip codes are home to about 185K people.
Zip codes
6
Population
185K
All zips combined
Largest zip
78665
66,171 residents
Income range
$87K–$138K
Median by zip