County Maps US

Union County, Mississippi

A county in Mississippi, ranked 29 of 82 by population.

CountyFIPS 28145

Within Mississippi
Union County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks New Albany, the county seat, located via the 2025 Census Gazetteer.

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Population
28,459
+647 (+2.3%) since 2020
Land area
415.6
square miles. A further 0.3% of the total area is water
Population density
68.5
people per square mile, computed rather than published
County seat
New Albany
Seat of county government.
Established
1870
155 years ago
Largest city
New Albany city
Population 7,756.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Union County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Union County, Mississippi from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 482 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Union County ranks

Position among the 82 counties of Mississippi, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MississippiNationally
Population28,45929th of 821,496th of 3,144
Land area415.6 sq mi70th of 822,432nd of 3,144
Population density68.5 per sq mi21st of 821,195th of 3,144
Median household income$55,50521st of 822,436th of 3,143

Full data for Union County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population28,459Vintage 2025 Population Estimates
Population in 202027,812Vintage 2025 Population Estimates
2020 estimates base?27,782Vintage 2025 Population Estimates
Land area415.6 sq mi2025 Gazetteer Files
Water area1.3 sq mi2025 Gazetteer Files
Total area416.9 sq mi2025 Gazetteer Files
Population density?68.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$55,505American Community Survey 2020-2024 5-Year Estimates
Median home value$163,400American Community Survey 2020-2024 5-Year Estimates
Median age38.3American Community Survey 2020-2024 5-Year Estimates
Households9,849American Community Survey 2020-2024 5-Year Estimates
Housing units12,250American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-26
327 births, 353 deaths
Net migration
+105
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Union County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Pontotoc CountyMississippi25 mi32,096
Tippah CountyMississippi20 mi21,389
Lee CountyMississippi15 mi83,731
Benton CountyMississippi9.9 mi7,502
Lafayette CountyMississippi8.0 mi59,597
Marshall CountyMississippi6.0 mi34,654
Prentiss CountyMississippi6.0 mi25,284

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 82 counties of Mississippi

Open the interactive Mississippi county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.