78491 ZIP Code: Williamson City 245, Texas
Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78491 in Williamson City 245, TX.
Postal & Geographic Specifications USPS Data
Demographic & Economic Profile (US Census Bureau)
American Community Survey (ACS) 5-Year Verified Metrics
Editor's Neighborhood Insight & Local Context
78491 is an active postal delivery zone serving Williamson City 245 in Williamson County, Texas. Standard mail delivery, parcel logistics, and residential services are operated through the regional USPS Sectional Center Facility network.
Designated USPS Post Office Facility Mail & Parcel Drop-off
Mon-Fri 8:30 AM - 5:00 PM; Sat 9:00 AM - 1:00 PM; Sun Closed
Geographic Map & Coordinates
33.9000, -103.9000Adjacent & Contiguous ZIP Codes
Nearby postal codes bordering 78491 in Williamson City 245
Frequently Asked Questions About 78491 (Williamson City 245, TX)
What county is ZIP code 78491 located in for tax and voter purposes? ▾
ZIP code 78491 is located within Williamson County, Texas. The official county seat is Georgetown, and the primary jurisdiction carries Texas FIPS code 48491.
What is the 4-digit ZIP+4 code for 78491? ▾
The full 9-digit postal code format is 78491-XXXX, where the last 4 digits specify exact delivery routes, high-rise buildings, or street blocks. For regular mail and parcel shipping, the 5-digit code 78491 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.
Where is the nearest USPS post office for 78491 and what are the lobby hours? ▾
The primary USPS facility serving 78491 is USPS Post Office - Williamson City 245, located at 100 Main St, Williamson City 245, TX 78491. Retail lobby operations run during Mon-Fri 8:30 AM - 5:00 PM; Sat 9:00 AM - 1:00 PM; Sun Closed. Contact inquiries can be made at (800) 275-8777.
What telephone area codes and time zone apply to 78491? ▾
ZIP code 78491 is located in the America/Chicago (CST / CDT) time zone (observing Daylight Saving Time). Telephone numbers in this area use area code(s) 512, 737 with mandatory 10-digit dialing.
What is the population and median household income for 78491? ▾
According to U.S. Census Bureau ACS data, ZIP code 78491 in Williamson City 245 has an estimated population of 9,625 residents and a median household income of $93,840 per year (compared to the Texas state median of $74,640).
What postal codes border 78491 in Williamson City 245? ▾
Adjacent and contiguous ZIP codes bordering 78491 include 78091 (Comal City 45, ~0 mi), 78191 (Memphis, ~0 mi), 78291 (Liberty, ~0 mi), 78391 (Refugio City 195, ~0 mi).