What is the largest city in Union County, AR?

El Dorado is the largest city or town in Union County, with about 17,115 residents.

How many ZIP codes are in Union County?

Union County includes 8 ZIP Code Tabulation Areas, including 71724, 71730, 71747, 71749, 71758.

What is the population of Union County, AR?

About 37,900 people live in Union County, based on American Community Survey 5-year estimates.

What counties border Union County?

Union County borders Columbia County, Ouachita County, Union Parish, LA, Ashley County, Claiborne Parish, LA, Bradley County, Calhoun County.

Union County, AR: Cities, ZIP Codes & Local Data

Population

37,900

Land area

1,039sq mi

People per sq mi

36

ZIP codes

8

Union County at a glance

Union County is 38% less dense than Arkansas as a whole.
The median household income is $55,259, 9% below the Arkansas median of $60,773.
A typical owner-occupied home is valued at $120,900 (36% below Arkansas) and median rent is $847 a month.
Its largest cities are El Dorado (17,115), Smackover (2,419) and Norphlet (1,003).

Local data for Union County, AR

Counts from official public data

Housing and community stats

Union County, AR, American Community Survey 2020-2024

Full profile

Median household income

$55,259

Poverty rate

19.5%

Median home value

$120,900

Prices -0.3% in a year

Median rent

$847/mo

Homeownership

72.7%

Bachelor's or higher

19.1%

Median age

41.4

Average commute

20.1 min

Largest reported origins and ancestries: German Americans (1,742), Irish Americans (1,720), Mexican Americans (1,570).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.6%

Aug 2026, -1.0 pts in a year

Average annual pay

$62,492

16,056 jobs, 2025

Income per person

$57,817

BEA, 2024

Federal spending

$268M

FY 2026, $6,868 per person

PPP loans

$104M

2,079 loans, 10,870 jobs reported

Campaign donations

$208K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Union County, AR, workers 16 and older. American Community Survey 5-year estimates

Drove alone84.6%
Carpooled7.0%
Public transit0.1%
Walked1.4%
Bicycle0.0%
Taxi, ride-hailing, motorcycle or other0.0%
Worked from home6.9%

Average one-way commute: 20.1 minutes for people who do not work from home.

Environment and hazard risk

Union County, AR, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: ice storm

Storm events since 1996

571

Most often thunderstorm wind

Flood insurance policies

72

0.5% of homes, county

July high / Jan low

93° / 32°F

50.5 inches of rain a year

Hazards, floods and storm history Check a flood zone 23 historic places

Health statistics

Share of adults in Union County, AR, CDC PLACES estimates

All 40 measures

Obesity

39.4%

U.S. 33.3% +6.1 pts

Diabetes

16.0%

U.S. 12.1% +3.9 pts

Smoking

17.6%

U.S. 12.8% +4.8 pts

Uninsured (18-64)

11.4%

U.S. 11.1% about the same

Cities, towns and ZIP codes in Union County

Population shown

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Frequently asked questions

What is the largest city in Union County, AR?: El Dorado is the largest city or town in Union County, with about 17,115 residents.
How many ZIP codes are in Union County?: Union County includes 8 ZIP Code Tabulation Areas, including 71724, 71730, 71747, 71749, 71758.
What is the population of Union County, AR?: About 37,900 people live in Union County, based on American Community Survey 5-year estimates.
What counties border Union County?: Union County borders Columbia County, Ouachita County, Union Parish, LA, Ashley County, Claiborne Parish, LA, Bradley County, Calhoun County.