78057 ZIP Code: Port Lavaca, Texas
Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78057 in Port Lavaca, 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
78057 is an active postal delivery zone serving Port Lavaca in Calhoun 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
31.1000, -101.5000Adjacent & Contiguous ZIP Codes
Nearby postal codes bordering 78057 in Port Lavaca
Frequently Asked Questions About 78057 (Port Lavaca, TX)
What county is ZIP code 78057 located in for tax and voter purposes? ▾
ZIP code 78057 is located within Calhoun County, Texas. The official county seat is Port Lavaca, and the primary jurisdiction carries Texas FIPS code 48057.
What is the 4-digit ZIP+4 code for 78057? ▾
The full 9-digit postal code format is 78057-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 78057 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.
Where is the nearest USPS post office for 78057 and what are the lobby hours? ▾
The primary USPS facility serving 78057 is USPS Post Office - Port Lavaca, located at 100 Main St, Port Lavaca, TX 78057. 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 78057? ▾
ZIP code 78057 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 78057? ▾
According to U.S. Census Bureau ACS data, ZIP code 78057 in Port Lavaca has an estimated population of 8,042 residents and a median household income of $83,040 per year (compared to the Texas state median of $74,640).
What postal codes border 78057 in Port Lavaca? ▾
Adjacent and contiguous ZIP codes bordering 78057 include 78157 (Richmond, ~0 mi), 78257 (Kaufman, ~0 mi), 78357 (Perryton, ~0 mi), 78457 (Woodville, ~0 mi).