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What county is Lancaster, TX in?

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

Lancaster, Texas is in Dallas County.

Lancaster at a glance

Population40,75314th largest place in Dallas County

Land area33.1 sq mi1,233 people per sq mi

Share of Dallas County2%of the county's residents live here

County seatDallas14 mi from Lancaster

Time zoneCentralAmerica/Chicago

Nearest county line3.4 mito Ellis County

How close is Lancaster to a county line?

The center of Lancaster (its Census internal point) is about 3.4 mi from the Ellis 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 Lancaster?

2 ZIP codes use the name Lancaster 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)
75134	Lancaster	Dallas County
75146	Lancaster	Dallas County 99%, Ellis County 1%

About Dallas County

County seat: Dallas. FIPS code 48113. Population 2,603,816. All Dallas County facts.

Towns near Lancaster

Bear Creek Ranch: 2.6 mi away, Dallas County
Hutchins: 4.9 mi away, Dallas County
DeSoto: 5.2 mi away, Dallas County
Wilmer: 5.4 mi away, Dallas County
Glenn Heights: 5.6 mi away, Dallas County
Red Oak: 6.0 mi away, Ellis County

Lancaster has about 40,753 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 Lancaster, TX in?

Lancaster, Texas is in Dallas County. The county seat of Dallas County is Dallas.

What ZIP codes are in Lancaster, TX?

75134, 75146.

Is Lancaster the county seat of Dallas County?

No. The county seat is Dallas, about 14 mi away.

What time zone is Lancaster, TX in?

Central time (America/Chicago).

How do I know which county my Lancaster 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.