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County · code 18075

Jay CountyIndiana

Jay County is a county in Indiana, formed in 1835 with Portland as its county seat.

  • Founded1835
  • County seatPortland
  • Named forJohn Jay
  • Land area384 sq mi + 0.2 sq mi water
  • Population20,478 2020 Census
  • Parcels mapped16,465 checked 15 October 2026
Open the free map Click any parcel in Jay County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

RandolphAdamsBlackfordMercer, OH Portland Census outline · seat marked

Where it is

Jay 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 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 CountyPosey 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 CountyJay County Jay
Counties of Indiana · Jay highlighted

History

Formed in 1835 from Adams County, Delaware County and Randolph County

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

Jay County was created on February 7, 1835, from parts of Adams, Delaware, and Randolph counties, though it was not fully organized until March 1, 1836. In 1838, Jay County lost territory to the creation of Blackford County; Blackford was fully organized and detached from Jay on January 29, 1839.

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

  1. 1835
    Jay County created Jay created from parts of Adams New Purchase attached to Delaware and Randolph; Jay not fully organized, parts attached to Delaware and Randolph for administrative and judicial purposes.
    from Adamsfrom Delawarefrom Randolph
    · Ind. Acts 1834, 19th sess., gen., ch. 25, sec. 3/p. 44
  2. 1836
    Changed Jay fully organized, detached from Delaware and Randolph.
    DelawareRandolph
    · Ind. Acts 1835, 20th sess., gen., ch. 15/p. 47
  3. 1838
    Lost territory Jay lost to creation of Blackford; Blackford not fully organized, attached to Jay for administrative and judicial purposes.
    to Blackford
    · Ind. Acts 1837, 22d sess., loc., ch. 97/p. 290
  4. 1839
    Changed Blackford fully organized, detached from Jay.
    Blackford
    · Ind. Acts 1838, 23d sess., gen., ch. 49/p. 64
  5. 1840
    Boundary clarified Jay boundaries were redefined (no change).
    no change
    · Ind. Acts 1839, 24th sess., gen., ch. 60/p. 79

Land and parcels

What the maps cover in Jay

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

Jay by the Census

Population
20,478 2020 Census count
Housing units
8,890 2020 Census count
Land area
384 square miles
Water area
0.2 square miles
People per sq mi
53 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

Jay 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 Jay 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 Jay County

When was Jay County founded?
Jay County was founded in 1835, formed from Adams County, Delaware County and Randolph County, and named after John Jay.
What is the county seat of Jay County?
The county seat of Jay County is Portland.
Is there an online parcel map for Jay County?
Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 16,465 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Jay County's boundary or name changed?
Jay County was created in 1835 from Adams County, Delaware County and Randolph County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Blackford County, Delaware County and Randolph County.
Is my lot in a flood zone?
We do not have flood maps for Jay 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