| ZIP Codes: | 10 ZIP Codes (6 Standard, 4 PO Box, 0 Unique) [See All] |
| Area Codes: | 327 / 870 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:52:44 PM |
| Population: | 38,413 [See All] |
| FIPS: | 05139 |
| CBSA: | El Dorado, AR |
| Land Area: | 1,030 sq mi |
| Water Area: | 16 sq mi |
| Coordinates: | 33.2180, -92.6073 |
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38,413 residents live across 10 ZIPs covering 1,030 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 41,131 to 38,413 from 2014 to 2024 — a -6.6% change. 2 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 71749 (Junction City, $68,188 median) and poorest ZIP 71765 (Strong, $38,636) are 34.4 miles apart — a 1.8× income gap across local geography.
Median home values vary 6.3× across this county — from $49,200 in 71765 (Strong) to $311,600 in 71759 (Norphlet).
Density varies 5731× across the county — from 9 people/sq mi in 71765 (Strong) to 49,592 in 71759 (Norphlet).
Educational attainment ranges from 4.3% bachelor's+ in 71747 (Huttig) to 57.9% in 71759 (Norphlet) — the breadth of educational profiles across the area.
Within Arkansas, this is the #19 most populous of 78 counties and ranks #54 for median household income .
Weighted by population, the typical household earns about $55,475 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.9% of adults age 25+ hold a bachelor's degree or higher (4,968 of 26,291 reporting).
6 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Union County lost 6.6% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 71730 | El Dorado | Standard | 29,760 | $55,770 | 477.8 | -7.9% |
| 71762 | Smackover | Standard | 2,929 | $50,577 | 48.9 | 20.6% |
| 71749 | Junction City | Standard | 2,787 | $68,188 | 155.1 | 19.7% |
| 71765 | Strong | Standard | 1,742 | $38,636 | 201.3 | -4.7% |
| 71747 | Huttig | Standard | 655 | $61,208 | 70.3 | -27.6% |
| 71759 | Norphlet | PO Box | 243 | — | 0.0 | -60.3% |
| 71758 | Mount Holly | Standard | 150 | — | 76.2 | -55.4% |
| 71724 | Calion | PO Box | 147 | $26,346 | 0.7 | -59.7% |
| 71750 | Lawson | PO Box | — | — | 0.0 | — |
| 71731 | El Dorado | PO Box | — | — | 0.0 | — |