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What county is Duncanville, TX in?

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

Duncanville, Texas is in Dallas County.

Duncanville at a glance

Population39,87915th largest place in Dallas County

Land area11.2 sq mi3,560 people per sq mi

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

County seatDallas13 mi from Duncanville

Time zoneCentralAmerica/Chicago

Nearest county line6.8 mito Ellis County

How close is Duncanville to a county line?

The center of Duncanville (its Census internal point) is about 6.8 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 Duncanville?

3 ZIP codes use the name Duncanville 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)
75116	Duncanville	Dallas County
75137	Duncanville	Dallas County
75138	Duncanville	Dallas County

About Dallas County

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

Towns near Duncanville

DeSoto: 4.4 mi away, Dallas County
Cedar Hill: 5.0 mi away, Dallas County
Cockrell Hill: 6.5 mi away, Dallas County
Grand Prairie: 6.8 mi away, Dallas County
Glenn Heights: 7.4 mi away, Dallas County
Ovilla: 7.4 mi away, Ellis County

Duncanville has about 39,879 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 Duncanville, TX in?

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

What ZIP codes are in Duncanville, TX?

75116, 75137, 75138.

Is Duncanville the county seat of Dallas County?

No. The county seat is Dallas, about 13 mi away.

What time zone is Duncanville, TX in?

Central time (America/Chicago).

How do I know which county my Duncanville 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.