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County · code 21183

Ohio CountyKentucky

Ohio County is a county in Kentucky, formed in 1799 from Hardin County, with its seat in Hartford.

  • Founded1799
  • County seatHartford
  • Named forOhio River
  • Land area587 sq mi + 8.9 sq mi water
  • Population23,772 2020 Census
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Updated

ButlerDaviessHancockMuhlenbergMcLeanGraysonBreckinridge Hartford Census outline · seat marked

Where it is

Ohio 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 CountyOldham CountyOwen CountyOwsley CountyPendleton CountyPerry CountyPike CountyPowell CountyPulaski CountyRobertson CountyRockcastle CountyRowan CountyRussell CountyScott CountyShelby CountySimpson CountySpencer CountyTaylor CountyTodd CountyTrigg CountyTrimble CountyUnion CountyWarren CountyWashington CountyWayne CountyWebster CountyWhitley CountyWolfe CountyWoodford CountyOhio County Ohio
Counties of Kentucky · Ohio highlighted

History

Formed in 1799 from Hardin County

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

Ohio County was created from Hardin County on July 1, 1799, and was named after the Ohio River. The county lost territory over the following decades as new counties were created from its land, including Henderson in 1809, Butler in 1810 and 1871, Grayson in 1810, Daviess in 1815 and 1830, Hancock in 1829, Breckinridge in 1831, and McLean in 1854.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1799
    Ohio County created Ohio created from Hardin.
    from Hardin
    · Ky. Acts 1798-1799, 7th assy., ch. 73, sec. 1/pp. 164-166; Ky. Acts 1799, 8th assy., res., pp. 211-212
  2. 1809
    Lost territory Ohio lost to Henderson.
    to Henderson
    · Ky. Acts 1808-1809, 17th assy., ch. 15/p. 19
  3. 1810
    Lost territory Ohio lost to creation of Butler.
    to Butler
    · Ky. Acts 1809-1810, 18th assy., ch. 119, sec. 1/pp. 44-47
  4. 1815
    Lost territory Ohio lost to creation of Daviess.
    to Daviess
    · Ky. Acts 1814-1815, 23d assy., ch. 190, sec. 1/pp. 265-267
  5. 1829
    Lost territory Ohio lost to creation of Hancock.
    to Hancock
    · Ky. Acts 1828-1829, 37th assy., ch. 32, sec. 1/pp. 30-32
Show all 12 changes (7 more)
  1. 1799
    Ohio County created Ohio created from Hardin.
    from Hardin
    · Ky. Acts 1798-1799, 7th assy., ch. 73, sec. 1/pp. 164-166; Ky. Acts 1799, 8th assy., res., pp. 211-212
  2. 1809
    Lost territory Ohio lost to Henderson.
    to Henderson
    · Ky. Acts 1808-1809, 17th assy., ch. 15/p. 19
  3. 1810
    Gained territory Ohio gained small areas on the Rough River and on Bear Creek from Hardin, lost to creation of Grayson.
    from Hardinfrom Grayson
    · Ky. Acts 1809-1810, 18th assy., ch. 133, sec. 1/pp. 68-70
  4. 1810
    Lost territory Ohio lost to creation of Butler.
    to Butler
    · Ky. Acts 1809-1810, 18th assy., ch. 119, sec. 1/pp. 44-47
  5. 1815
    Lost territory Ohio lost to creation of Daviess.
    to Daviess
    · Ky. Acts 1814-1815, 23d assy., ch. 190, sec. 1/pp. 265-267
  6. 1815
    Gained territory Ohio gained small area from Daviess.
    from Daviess
    · Ky. Acts 1815-1816, 24th assy., ch. 274, sec. 1/p. 462
  7. 1819
    Boundary clarified Ohio boundaries were clarified (no change).
    no change
    · Ky. Acts 1818-1819, 27th assy., ch. 319/p. 607
  8. 1829
    Lost territory Ohio lost to creation of Hancock.
    to Hancock
    · Ky. Acts 1828-1829, 37th assy., ch. 32, sec. 1/pp. 30-32
  9. 1830
    Lost territory Ohio lost to Daviess.
    to Daviess
    · Ky. Acts 1829-1830, 38th assy., ch. 306, sec. 1/pp. 149-150
  10. 1831
    Lost territory Ohio lost to Breckinridge.
    to Breckinridge
    · Ky. Acts 1830-1831, 39th assy., ch. 471, secs. 1, 3/pp. 79-80
  11. 1854
    Lost territory Ohio lost to creation of McLean.
    to McLean
    · Ky. Acts 1853-1854, vol. 1, ch. 125, sec. 1/pp. 7-10
  12. 1871
    Lost territory Ohio lost to Butler.
    to Butler
    · Ky. Acts 1871, Jan. adj. sess., ch. 1595, sec. 1/p. 64

Land and parcels

What the maps cover in Ohio

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

Ohio by the Census

Population
23,772 2020 Census count
Housing units
10,159 2020 Census count
Land area
587 square miles
Water area
8.9 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

Ohio 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

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Questions

Common questions about Ohio County

When was Ohio County founded?
Ohio County was founded in 1799, formed from Hardin County, and named after Ohio River.
What is the county seat of Ohio County?
The county seat of Ohio County is Hartford.
Is there an online parcel map for Ohio County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Ohio County's boundary or name changed?
Ohio County was created in 1799 from Hardin County. Since then the Atlas of Historical County Boundaries records 10 later changes, chiefly involving Daviess County, Butler County and Breckinridge County.
Is my lot in a flood zone?
We do not have flood maps for Ohio 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