Where Is Dallas County? All 5 Dallas Counties on a Map

Where is Dallas County?

5 Dallas Counties in 5 states · 2.8 million people (2025)

There are 5 counties named Dallas County in the United States, in Alabama, Arkansas, Iowa, Missouri and Texas. The most populous is Dallas County, Texas (county seat: Dallas), with 2,661,397 people in 2025. 4 of them are named after George M. Dallas, vice president of the United States from 1845 to 1849 (1792–1864).

All 5 Dallas Counties

Sorted by state. Each link opens the county's map.

State	County seat	Population 2025	Land area (sq mi)	Established	Named after
Dallas County, Alabama	Selma	35,140	979	1818	Alexander J. Dallas
Dallas County, Arkansas	Fordyce	6,011	667	1845	George M. Dallas
Dallas County, Iowa	Adel	118,457	588	1846	George M. Dallas
Dallas County, Missouri	Buffalo	18,025	541	1841	George M. Dallas
Dallas County, Texas	Dallas	2,661,397	873	1846	George M. Dallas

Questions about Dallas Counties

How many Dallas Counties are there?

There are 5 Dallas Counties in the United States, in Alabama, Arkansas, Iowa, Missouri and Texas.

Which Dallas County is the largest?

By population, Dallas County, Texas (2,661,397 people in 2025). By land area, Dallas County, Alabama (979 sq mi).

Which Dallas County is the oldest?

Dallas County, Alabama, established in 1818. The newest is Dallas County, Texas (1846).

Why are there so many Dallas Counties?

4 of the 5 are named after George M. Dallas, vice president of the United States from 1845 to 1849 (1792–1864). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Dallas County an address is in?

Open the county map of the state: it has a search box for cities, towns and ZIP codes. On a phone, the "what county am I in" tool on our sister site uses your location.

What county am I in? →