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County · code 18129

Posey CountyIndiana

Posey County is located in Indiana and was created in 1814. The county is named after Thomas Posey and has Mount Vernon as its seat.

  • Founded1814
  • County seatMount Vernon
  • Named forThomas Posey
  • Land area409 sq mi + 10 sq mi water
  • Population25,222 2020 Census
  • Parcels mapped20,448 checked 15 October 2026
Open the free map Click any parcel in Posey County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

VanderburghWhite, ILUnion, KYHenderson, KYGibsonGallatin, IL Mount Vernon Census outline · seat marked

Where it is

Posey on the map of Indiana

Indiana has 92 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAllen CountyBartholomew CountyBenton CountyBlackford CountyBoone CountyBrown CountyCarroll CountyCass CountyClark CountyClay CountyClinton CountyCrawford CountyDaviess CountyDearborn CountyDecatur CountyDeKalb CountyDelaware CountyDubois CountyElkhart CountyFayette CountyFloyd CountyFountain CountyFranklin CountyFulton CountyGibson CountyGrant CountyGreene CountyHamilton CountyHancock CountyHarrison CountyHendricks CountyHenry CountyHoward CountyHuntington CountyJackson CountyJasper CountyJay CountyJefferson CountyJennings CountyJohnson CountyKnox CountyKosciusko CountyLaGrange CountyLake CountyLaPorte CountyLawrence CountyMadison CountyMarion CountyMarshall CountyMartin CountyMiami CountyMonroe CountyMontgomery CountyMorgan CountyNewton CountyNoble CountyOhio CountyOrange CountyOwen CountyParke CountyPerry CountyPike CountyPorter CountyPulaski CountyPutnam CountyRandolph CountyRipley CountyRush CountySt. Joseph CountyScott CountyShelby CountySpencer CountyStarke CountySteuben CountySullivan CountySwitzerland CountyTippecanoe CountyTipton CountyUnion CountyVanderburgh CountyVermillion CountyVigo CountyWabash CountyWarren CountyWarrick CountyWashington CountyWayne CountyWells CountyWhite CountyWhitley CountyPosey County Posey
Counties of Indiana · Posey highlighted

History

Formed in 1814 from Warrick County

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

Posey County was created by the Indiana Territory from Warrick County in 1814. When Indiana became a state in 1816, Posey County was established as a county in Indiana, gaining a small area from Gibson County. Over the following decades, the county's boundaries shifted through various gains and losses, including the creation of Vanderburgh County from Posey land in 1818 and ongoing boundary adjustments with Gibson County.

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

  1. 1814
    Posey County created Posey created by Indiana Territory from Warrick.
    from Warrick
    · Ind. Terr. Laws, 1809-1816, ch. 7/pp. 529-533
  2. 1816
    Gained territory Posey gained small area from Gibson.
    from Gibson
    · Ind. Terr. Laws, 1809-1816, ch. 3/pp. 604-605
  3. 1816
    Became part of Indiana Posey became a county in Indiana whe the state of Indiana was created from Indiana Territory and small parts of Illinois and Michigan Territories. · U.S. Stat., vol. 3, ch. 57 [1816], secs. 1-2/p. 289 and res. 1 [1816]/p. 399; Van Zandt, 115
  4. 1817
    Gained territory Posey gained from Gibson.
    from Gibson
    · Ind. Acts 1816, 1st sess., ch. 48, sec. 1/p. 202
  5. 1818
    Lost territory Posey lost to creation of Vanderburgh.
    to Vanderburgh
    · Ind. Acts 1817, 2d sess., spec., ch. 10, sec. 1/p. 22
  6. 1822
    Lost territory Posey lost to Gibson.
    to Gibson
    · Ind. Acts 1821, 6th sess., ch. 63/p. 120
  7. 1823
    Gained territory Posey gained from Gibson.
    from Gibson
    · Ind. Acts 1822, 7th sess., ch. 61/p. 116

Land and parcels

What the maps cover in Posey

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

Posey by the Census

Population
25,222 2020 Census count
Housing units
11,021 2020 Census count
Land area
409 square miles
Water area
10 square miles
People per sq mi
62 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

Posey 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 Posey County

When was Posey County founded?
Posey County was founded in 1814, formed from Warrick County, and named after Thomas Posey.
What is the county seat of Posey County?
The county seat of Posey County is Mount Vernon.
Is there an online parcel map for Posey County?
Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 20,448 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Posey County's boundary or name changed?
Posey County was created in 1814 from Warrick County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Gibson County and Vanderburgh County.
Is my lot in a flood zone?
We do not have flood maps for Posey 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