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County · code 21225

Union CountyKentucky

Union County is a county in Kentucky with its seat in Morganfield. The county was formed on May 1, 1811.

  • Founded1811
  • County seatMorganfield
  • Land area343 sq mi + 20 sq mi water
  • Population13,668 2020 Census
  • Parcels mapped8,893 checked 15 October 2026
Open the free map Click any parcel in Union County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

WebsterGallatin, ILCrittendenHardin, ILPosey, INHenderson Morganfield Census outline · seat marked

Where it is

Union on the map of Kentucky

Kentucky has 120 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adair CountyAllen CountyAnderson CountyBallard CountyBarren CountyBath CountyBell CountyBoone CountyBourbon CountyBoyd CountyBoyle CountyBracken CountyBreathitt CountyBreckinridge CountyBullitt CountyButler CountyCaldwell CountyCalloway CountyCampbell CountyCarlisle CountyCarroll CountyCarter CountyCasey CountyChristian CountyClark CountyClay CountyClinton CountyCrittenden CountyCumberland CountyDaviess CountyEdmonson CountyElliott CountyEstill CountyFayette CountyFleming CountyFloyd CountyFranklin CountyFulton CountyGallatin CountyGarrard CountyGrant CountyGraves CountyGrayson CountyGreen CountyGreenup CountyHancock CountyHardin CountyHarlan CountyHarrison CountyHart CountyHenderson CountyHenry CountyHickman CountyHopkins CountyJackson CountyJefferson CountyJessamine CountyJohnson CountyKenton CountyKnott CountyKnox CountyLarue CountyLaurel CountyLawrence CountyLee CountyLeslie CountyLetcher CountyLewis CountyLincoln CountyLivingston CountyLogan CountyLyon CountyMcCracken CountyMcCreary CountyMcLean CountyMadison CountyMagoffin CountyMarion CountyMarshall CountyMartin CountyMason CountyMeade CountyMenifee CountyMercer CountyMetcalfe CountyMonroe CountyMontgomery CountyMorgan CountyMuhlenberg CountyNelson CountyNicholas CountyOhio CountyOldham CountyOwen CountyOwsley CountyPendleton CountyPerry CountyPike CountyPowell CountyPulaski CountyRobertson CountyRockcastle CountyRowan CountyRussell CountyScott CountyShelby CountySimpson CountySpencer CountyTaylor CountyTodd CountyTrigg CountyTrimble CountyWarren CountyWashington CountyWayne CountyWebster CountyWhitley CountyWolfe CountyWoodford CountyUnion County Union
Counties of Kentucky · Union highlighted

History

Formed in 1811 from Henderson County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Union County was created from Henderson County in 1811. The county lost territory to the creation of Webster County in 1860 and 1862.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1811
    Union County created Union created from Henderson.
    from Henderson
    · Ky. Acts 1810-1811, 19th assy., ch. 220, sec. 1/pp. 41-43
  2. 1860
    Lost territory Union lost to creation of Webster.
    to Webster
    · Ky. Acts 1859-1860, vol. 1, ch. 822, sec. 1/pp. 76-78
  3. 1862
    Lost territory Union lost to Webster.
    to Webster
    · Ky. Acts 1861, Nov. called sess., ch. 279, secs. 1, 3/p. 37

Land and parcels

What the maps cover in Union

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Union by the Census

Population
13,668 2020 Census count
Housing units
5,863 2020 Census count
Land area
343 square miles
Water area
20 square miles
People per sq mi
40 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Union County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Union County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Union County

When was Union County founded?
Union County was founded in 1811, formed from Henderson County.
What is the county seat of Union County?
The county seat of Union County is Morganfield.
Is there an online parcel map for Union County?
Yes. Union County publishes a parcel map of 8,893 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Union County's boundary or name changed?
Union County was created in 1811 from Henderson County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Webster County.
Is my lot in a flood zone?
We do not have flood maps for Union County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door