Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/AR/COUNTY/UNION

Union County, AR ZIP codes

There are 10 ZIP codes in Union County, AR, in 9 towns, from 71724 to 71765. The largest are 71730 (El Dorado), 71762 (Smackover) and 71749 (Junction City).

The county seat is El Dorado.

ZIP codes
10
Towns
9
County seat
El Dorado
County FIPS
05139
Population
37,900
Median household income
$55,259
Land area
1,039 sq mi
Area code
870
Metro area
El Dorado

Union County ZIP codes by town

El Dorado (county seat)
71730, 71731

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Union County ZIP codes

71724717307173171747717497175071758717597176271765

The ZIP codes of Union County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Union County in numbers

About 37,900 people live in Union County, in 15,002 households, the 21st most populous of Arkansas's 75 counties. The median household income is $55,259 a year, 9% below the Arkansas median of $60,773 (US: $80,734). The median owner-occupied home is valued at $120,900 (36% below the Arkansas median), and median gross rent is $847 a month. The median age is 41.4; 19.1% of adults 25 and over hold a bachelor's degree or higher (25.7% across Arkansas); the average commute takes 20 minutes.

Population37,900Union37,900
Households15,002Union15,002
Median age41.4Union41.4Arkansas38.5US 38.9
Median household income$55,259Union$55,259Arkansas$60,773US $80,734
Median home value$120,900Union$120,900Arkansas$188,000US $332,700
Median gross rent$847Union$847Arkansas$947US $1,413
Bachelor's degree or higher19.1%Union19.1%Arkansas25.7%US 35.7%
Mean commute20.1 minUnion20.1 minArkansas22.5 minUS 26.4 min
Population density36 / sq miUnion36 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Union County

Largest towns in Union County
TownZIP codesPopulation
El Dorado 2 17,115
Smackover 1 2,419
Norphlet 1 1,003
Junction City 1 564
Strong 1 434
Huttig 1 401
Calion 1 355
Lawson 1 86
Mount Holly 1 18

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Union County.

Not sure you are in Union County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Union County, with figures

ZIP codes in Union County
ZIP City Type Population Median income Median home
71724 Calion , AR Standard 147 $26,346 $81,700
71730 El Dorado , AR Standard 29,760 $55,770 $130,300
71731 El Dorado , AR No street area — — —
71747 Huttig , AR Standard 655 $61,208 $83,600
71749 Junction City , AR Standard 2,787 $68,188 $118,600
71750 Lawson , AR No street area — — —
71758 Mount Holly , AR Standard 150 — $59,000
71759 Norphlet , AR Standard 243 — $311,600
71762 Smackover , AR Standard 2,929 $50,577 $106,400
71765 Strong , AR Standard 1,742 $38,636 $49,200

Cite this page

zipcodes.pro. “Union County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ar/county/union

Underlying data is public domain or openly licensed — sources, vintages and licences.