Round Rock, TX ZIP Codes & Directory
Round Rock is an incorporated city in Williamson County, Texas. Browse all active 5-digit USPS postal codes serving Round Rock and surrounding Williamson County delivery districts.
All ZIP Codes in Round Rock, TX
1 CodesAbout Round Rock Mail Delivery & Postal Administration
ZIP codes in Round Rock are administered by the United States Postal Service. Delivery routes are coordinated through regional Sectional Center Facilities (SCFs) servicing Williamson County and surrounding Texas metropolitan districts.
Frequently Asked Questions About Round Rock, TX ZIP Codes
How many ZIP codes serve Round Rock, Texas? ▾
Round Rock, Texas is served by 1 active USPS postal delivery codes: 78664.
What county is Round Rock located in? ▾
Round Rock is an incorporated city located within Williamson County, Texas.
What is the population and demographic size of Round Rock? ▾
According to U.S. Census Bureau data, Round Rock has an estimated population of 119,468 residents and is situated within the Greater Austin.
How does mail sorting and delivery work in Round Rock? ▾
Mail delivery in Round Rock is operated by the United States Postal Service through regional Sectional Center Facility (SCF) distribution plants servicing Williamson County and surrounding Texas counties.