Caldwell County, Texas ZIP codes
7 ZIP codes are in Caldwell County, plus 7 that cross in from neighboring counties. It's part of the Austin-Round Rock-San Marcos, TX metro area.
- ZIP codes
- 7
- Population in these ZIPs
- 48,637
- Avg. median income
- $68,800population-weighted
- Cities & towns
- 7
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Caldwell County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 78616 | Dale | 10,683 | $64,715 | $354,200 |
| 78622 | Fentress | 331 | — | $227,200 |
| 78644 | Lockhart | 22,348 | $74,709 | $277,600 |
| 78648 | Luling | 7,863 | $57,621 | $225,500 |
| 78655 | Martindale | 3,730 | $55,952 | $329,500 |
| 78656 | Maxwell | 2,847 | $81,346 | $252,500 |
| 78661 | Prairie Lea | 835 | $82,896 | $201,900 |
ZIP codes partly in Caldwell County
These ZIP codes are mostly in a neighboring county but cover part of Caldwell County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 78610 | Buda | Hays County | 48,319 | $119,698 | $358,500 |
| 78632 | Harwood | Gonzales County | 1,245 | $62,500 | $417,200 |
| 78640 | Kyle | Hays County | 77,531 | $90,075 | $293,500 |
| 78662 | Red Rock | Bastrop County | 3,015 | $94,005 | $443,500 |
| 78666 | San Marcos | Hays County | 88,583 | $54,737 | $309,400 |
| 78953 | Rosanky | Bastrop County | 1,089 | $83,438 | $535,800 |
| 78959 | Waelder | Gonzales County | 1,157 | $60,472 | $294,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Caldwell County
Nearby counties
Frequently asked questions
How many ZIP codes are in Caldwell County, Texas?
7 ZIP codes are mainly in Caldwell County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Caldwell County?
ZIP codes in Caldwell County use the city names Dale, Fentress, Lockhart, Luling, Martindale, Maxwell and Prairie Lea.
What metro area is Caldwell County in?
Caldwell County is part of the Austin-Round Rock-San Marcos, TX metropolitan statistical area.