Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/TX/COUNTY/CALDWELL

Caldwell County, TX ZIP codes

There are 7 ZIP codes in Caldwell County, TX, in 7 towns, from 78616 to 78661. The largest are 78644 (Lockhart), 78616 (Dale) and 78648 (Luling). 2 more cross into it from neighbouring counties: 78953 and 78632.

The county seat is Lockhart.

ZIP codes
7
Partly in it
2 more
Towns
7
County seat
Lockhart
County FIPS
48055
State
Texas
Population
48,669
Median household income
$69,758
Land area
545 sq mi
Area codes
512, 737

Caldwell County ZIP codes by town

Lockhart (county seat)
78644

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Caldwell County

These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Caldwell County.

Map of Caldwell County ZIP codes

78616786227864478648786557865678661

The ZIP codes of Caldwell County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Caldwell County in numbers

About 48,669 people live in Caldwell County, in 16,647 households, the 73rd most populous of Texas's 254 counties. The median household income is $69,758 a year, 11% below the Texas median of $78,476 (US: $80,734). The median owner-occupied home is valued at $240,500 (15% below the Texas median), and median gross rent is $1,173 a month. The median age is 38.4; 19.3% of adults 25 and over hold a bachelor's degree or higher (33.8% across Texas); the average commute takes 34 minutes.

Population48,669Caldwell48,669
Households16,647Caldwell16,647
Median age38.4Caldwell38.4Texas35.6US 38.9
Median household income$69,758Caldwell$69,758Texas$78,476US $80,734
Median home value$240,500Caldwell$240,500Texas$283,800US $332,700
Median gross rent$1,173Caldwell$1,173Texas$1,403US $1,413
Bachelor's degree or higher19.3%Caldwell19.3%Texas33.8%US 35.7%
Mean commute34.3 minCaldwell34.3 minTexas26.7 minUS 26.4 min
Population density89 / sq miCaldwell89 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Caldwell County

Largest towns in Caldwell County
TownZIP codesPopulation
Lockhart 1 15,326
Dale 1 10,683
Luling 1 5,531
Maxwell 1 2,847
Martindale 1 1,072
Prairie Lea 1 835
Fentress 1 331

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Caldwell County.

Not sure you are in Caldwell County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Caldwell County, with figures

ZIP codes in Caldwell County
ZIP City Type Population Median income Median home
78616 Dale , TX Standard 10,683 $64,715 $211,500
78622 Fentress , TX Standard 331 — $160,900
78644 Lockhart , TX Standard 22,348 $74,709 $279,800
78648 Luling , TX Standard 7,863 $57,621 $217,500
78655 Martindale , TX Standard 3,730 $55,952 $269,900
78656 Maxwell , TX Standard 2,847 $81,346 $238,100
78661 Prairie Lea , TX Standard 835 $82,896 $209,700

Cite this page

zipcodes.pro. “Caldwell County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/tx/county/caldwell

Underlying data is public domain or openly licensed — sources, vintages and licences.