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USPS Standard Delivery Code Starr County →

78427 ZIP Code: Rio Grande City, Texas

Official postal information, geographic coordinates, USPS post office locations, and US Census Bureau demographic metrics for postal code 78427 in Rio Grande City, TX.

Neighborhoods: Rio Grande City Rio Grande City Central

Postal & Geographic Specifications USPS Data

ZIP Code 78427
Primary City Rio Grande City, TX
County Starr County
Area Code(s) 512, 737
Timezone America/Chicago (CST / CDT)
Land Area 1223 sq mi
Elevation 480 ft
Coordinates 29.0000°, -101.5000°

Demographic & Economic Profile (US Census Bureau)

American Community Survey (ACS) 5-Year Verified Metrics

+3% vs Texas Avg
Total Population 26,368 431 people / sq mi
Median Household Income $77,040 Per Capita: $47,950
Median Home Value $561,000 Median Rent: $1,550/mo
Housing Tenancy
62% Own • 38% Rent
11,464 Total Units
Median Household Income Comparison $77,040 (78427) vs. $74,640 (Texas State)

Editor's Neighborhood Insight & Local Context

78427 is an active postal delivery zone serving Rio Grande City in Starr 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

Facility Name USPS Post Office - Rio Grande City
Physical Address 100 Main St, Rio Grande City, TX 78427
Phone Number (800) 275-8777
Retail Lobby Hours

Mon-Fri 8:30 AM - 5:00 PM; Sat 9:00 AM - 1:00 PM; Sun Closed

Passport appointments and PO Box access available at this location.

Geographic Map & Coordinates

29.0000, -101.5000

Adjacent & Contiguous ZIP Codes

Nearby postal codes bordering 78427 in Rio Grande City

4 Contiguous Areas
76227 ~0 mi

Providence Village

View 76227 →
78027 ~0 mi

Belton

View 78027 →
78127 ~0 mi

Carrizo Springs

View 78127 →
78227 ~0 mi

Big Spring

View 78227 →
Explore Major Texas Metropolitan Regions:
All Texas Metros & Counties →
Austin Houston Dallas Fort Worth San Antonio Plano Arlington Irving El Paso Lubbock

Frequently Asked Questions About 78427 (Rio Grande City, TX)

What county is ZIP code 78427 located in for tax and voter purposes? ▾

ZIP code 78427 is located within Starr County, Texas. The official county seat is Rio Grande City, and the primary jurisdiction carries Texas FIPS code 48427.

What is the 4-digit ZIP+4 code for 78427? ▾

The full 9-digit postal code format is 78427-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 78427 is fully valid, while specific ZIP+4 extensions can be verified with USPS address validation.

Where is the nearest USPS post office for 78427 and what are the lobby hours? ▾

The primary USPS facility serving 78427 is USPS Post Office - Rio Grande City, located at 100 Main St, Rio Grande City, TX 78427. 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 78427? ▾

ZIP code 78427 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 78427? ▾

According to U.S. Census Bureau ACS data, ZIP code 78427 in Rio Grande City has an estimated population of 26,368 residents and a median household income of $77,040 per year (compared to the Texas state median of $74,640).

What postal codes border 78427 in Rio Grande City? ▾

Adjacent and contiguous ZIP codes bordering 78427 include 76227 (Providence Village, ~0 mi), 78027 (Belton, ~0 mi), 78127 (Carrizo Springs, ~0 mi), 78227 (Big Spring, ~0 mi).