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What county is Kyle, TX in?

Updated November 1, 2026 · Data: U.S. Census Bureau

Kyle, Texas is in Hays County. Kyle mailing addresses (ZIP codes named Kyle) also reach Caldwell County, so check your street.

Kyle at a glance

Population52,4392nd largest place in Hays County

Land area32.5 sq mi1,613 people per sq mi

Share of Hays County20%of the county's residents live here

County seatSan Marcos8.9 mi from Kyle

Time zoneCentralAmerica/Chicago

Nearest county line5.6 mito Caldwell County

How close is Kyle to a county line?

The center of Kyle (its Census internal point) is about 5.6 mi from the Caldwell County line. Homes near the edge of town can be much closer; if you live near a line, check your address and the lookup will tell you how far you are from it.

What ZIP codes are in Kyle?

1 ZIP codes use the name Kyle or are centered in it. Shares are of each ZIP's land; a ZIP named after a town can reach beyond its city limits.

ZIP	Post office name	County (land share)
78640	Kyle	Hays County 84%, Caldwell County 15%, Travis County 1%

About Hays County

County seat: San Marcos. FIPS code 48209. Population 256,429. All Hays County facts.

Towns near Kyle

Uhland: 6.0 mi away, Hays County
Buda: 6.2 mi away, Hays County
Niederwald: 6.4 mi away, Hays County
San Marcos: 8.9 mi away, Hays County
Manchaca: 10 mi away, Travis County
Martindale: 11 mi away, Caldwell County

Kyle has about 52,439 people. It is an incorporated city or town.

Sources: ACS 2019-2023 5-year (residents by county, table B01003); Census TIGER/Line 2024 and Gazetteer 2024 (land, location); Census 2020 ZCTA file and GeoNames (ZIP codes). Data as of November 1, 2026. Not affiliated with any government agency.

FAQ

Frequently asked questions

What county is Kyle, TX in?

Kyle, Texas is in Hays County. Kyle mailing addresses (ZIP codes named Kyle) also reach Caldwell County, so check your street. The county seat of Hays County is San Marcos.

What ZIP codes are in Kyle, TX?

78640.

Is Kyle the county seat of Hays County?

No. The county seat is San Marcos, about 8.9 mi away.

What time zone is Kyle, TX in?

Central time (America/Chicago).

How do I know which county my Kyle address is in?

Use the address lookup at your home, or check your appraisal district record.

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CountyFinder is an independent website. It is not affiliated with the U.S. Census Bureau, USPS or any county, state or federal agency. County boundaries are from Census TIGER/Line, published for statistical purposes only: they are not a determination of jurisdictional authority or legal land descriptions. For legal or tax purposes, confirm your county with the county.