78455 ZIP Code: Trinity City 227, Texas
Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78455 in Trinity City 227, 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
78455 is an active postal delivery zone serving Groveton in Trinity 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, -99.3000Adjacent & Contiguous ZIP Codes
Nearby postal codes bordering 78455 in Trinity City 227
Frequently Asked Questions About 78455 (Trinity City 227, TX)
What county is ZIP code 78455 located in for tax and voter purposes? ▾
ZIP code 78455 is located within Trinity County, Texas. The official county seat is Groveton, and the primary jurisdiction carries Texas FIPS code 48455.
What is the 4-digit ZIP+4 code for 78455? ▾
The full 9-digit postal code format is 78455-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 78455 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.
Where is the nearest USPS post office for 78455 and what are the lobby hours? ▾
The primary USPS facility serving 78455 is USPS Post Office - Groveton, located at 100 Main St, Groveton, TX 78455. 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 78455? ▾
ZIP code 78455 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 78455? ▾
According to U.S. Census Bureau ACS data, ZIP code 78455 in Groveton has an estimated population of 5,441 residents and a median household income of $80,640 per year (compared to the Texas state median of $74,640).
What postal codes border 78455 in Groveton? ▾
Adjacent and contiguous ZIP codes bordering 78455 include 78055 (Lockhart, ~0 mi), 78155 (Crowell, ~0 mi), 78255 (Karnes City, ~0 mi), 78355 (Nueces City 177, ~0 mi).