78131 ZIP Code: Duval City 65, Texas
Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78131 in Duval City 65, 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
78131 is an active postal delivery zone serving San Diego in Duval 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
29.7000, -103.9000Adjacent & Contiguous ZIP Codes
Nearby postal codes bordering 78131 in Duval City 65
Frequently Asked Questions About 78131 (Duval City 65, TX)
What county is ZIP code 78131 located in for tax and voter purposes? ▾
ZIP code 78131 is located within Duval County, Texas. The official county seat is San Diego, and the primary jurisdiction carries Texas FIPS code 48131.
What is the 4-digit ZIP+4 code for 78131? ▾
The full 9-digit postal code format is 78131-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 78131 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.
Where is the nearest USPS post office for 78131 and what are the lobby hours? ▾
The primary USPS facility serving 78131 is USPS Post Office - San Diego, located at 100 Main St, San Diego, TX 78131. 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 78131? ▾
ZIP code 78131 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 78131? ▾
According to U.S. Census Bureau ACS data, ZIP code 78131 in San Diego has an estimated population of 3,932 residents and a median household income of $81,840 per year (compared to the Texas state median of $74,640).
What postal codes border 78131 in San Diego? ▾
Adjacent and contiguous ZIP codes bordering 78131 include 78031 (Johnson City, ~0 mi), 78231 (Greenville, ~0 mi), 78331 (Cameron, ~0 mi), 78431 (Sterling City, ~0 mi).