78664 Property Tax Rate

Property owners in ZIP code 78664 (Round Rock, Texas) pay a median of $5,624/year in property taxes on homes valued at $317,400. This translates to an effective tax rate of 1.77%, which is 31% above the Texas state average of 1.35%.

The monthly property tax burden for a median-valued home in 78664 is approximately $469, which factors into escrow payments on mortgages. This ZIP code is located within Williamson County. This is $2,493 more than the Texas average of $3,131/year.

Compared to similar ZIP codes in Texas, 78664 has higher property taxes. ZIP codes with similar effective rates include 78201 (1.77%) and 77533 (1.77%).

In Round Rock, property taxes represent approximately 6.5% of the median household income of $85,919, providing context for the relative tax burden on homeowners in this area.

Texas caps annual appraisal increases at 10% for homestead properties, but this cap only applies once you file — submit your Homestead Exemption application to the Williamson County Appraisal District by April 30 of the year following purchase. The exemption removes a portion of assessed value from school and county taxes, typically saving $800–$1,500/year even on a median $370,400 home in this fast-growing county. File your exemption with the Williamson County Assessor immediately after closing and request confirmation of your homestead cap status, as Williamson County appraisals tend to increase rapidly.