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County ZIP codes · Texas · FIPS 48057

Calhoun County, TX ZIP Codes

Calhoun County, Texas has 6 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 4 of the residential ones lie mainly in Calhoun County and 2 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $64,666 in 77465 (Palacios) to $77,039 in 77979 (Port Lavaca) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Calhoun County?

77465 · Palacios: $65k77978 · Point Comfort: $143k77979 · Port Lavaca: $77k77982 · Port O Connor: $96k77983 · Seadrift: $98k77990 · Tivoli: $75k77979774657799077983779827797877465 · Palacios: $65k77978 · Point Comfort: $143k77979 · Port Lavaca: $77k77982 · Port O Connor: $96k77983 · Seadrift: $98k77990 · Tivoli: $75k77979774657799077983779827797877465 · Palacios: $65k77978 · Point Comfort: $143k77979 · Port Lavaca: $77k77982 · Port O Connor: $96k77983 · Seadrift: $98k77990 · Tivoli: $75k7797977465779907798377982
The residential ZIP codes of Calhoun County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

They carry 6 postal town names: Port Lavaca, Palacios, Seadrift, Port O Connor, Tivoli, Point Comfort.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 6 residential ZIP codes in Calhoun County

4 ZIP codes lie mainly in Calhoun County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Calhoun County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
77979 Port Lavaca 16,488 48 $77k $156k 80%
77983 Seadrift 2,529 29 $98k $292k 100%
77982 Port O Connor 620 14 $96k $415k 100%
77978 Point Comfort 304 179 $143k $252k 100%

Partly in Calhoun County

Residential ZIP codes mainly in another county that reach at least 1% into Calhoun County, by their share here
In this county
77990 Tivoli 590 4 $75k $54k 21%
77465 Palacios 7,681 33 $65k $177k 3%

Download the 6 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

3 ZIP codes of Calhoun County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Calhoun County and in the neighboring counties
ZIPIn CalhounElsewhere
7797980%Victoria County11%; Jackson County9%
774653%Matagorda County77%; Jackson County20%
7799021%Refugio County79%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Calhoun County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Calhoun County's ZIP codes use 2 prefixes: 774 and 779.

Three-digit prefixes of Calhoun County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Calhoun County's
PrefixSectional centerHereAll codes
774South Houston, TX (SCF 774)183
779Corpus Christi, TX (SCF 783)538

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.