78431 ZIP Code: Sterling City, Texas
Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78431 in Sterling City, 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
78431 is an active postal delivery zone serving Sterling City in Sterling 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 78431 in Sterling City
Frequently Asked Questions About 78431 (Sterling City, TX)
What county is ZIP code 78431 located in for tax and voter purposes? ▾
ZIP code 78431 is located within Sterling County, Texas. The official county seat is Sterling City, and the primary jurisdiction carries Texas FIPS code 48431.
What is the 4-digit ZIP+4 code for 78431? ▾
The full 9-digit postal code format is 78431-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 78431 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.
Where is the nearest USPS post office for 78431 and what are the lobby hours? ▾
The primary USPS facility serving 78431 is USPS Post Office - Sterling City, located at 100 Main St, Sterling City, TX 78431. 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 78431? ▾
ZIP code 78431 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 78431? ▾
According to U.S. Census Bureau ACS data, ZIP code 78431 in Sterling City has an estimated population of 800 residents and a median household income of $81,840 per year (compared to the Texas state median of $74,640).
What postal codes border 78431 in Sterling City? ▾
Adjacent and contiguous ZIP codes bordering 78431 include 78031 (Johnson City, ~0 mi), 78131 (San Diego, ~0 mi), 78231 (Greenville, ~0 mi), 78331 (Cameron, ~0 mi).