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County · code 18097

Marion CountyIndiana

Marion County is a county in Indiana with its seat in Indianapolis. The county was formed on April 1, 1822, from parts of Delaware and Adams counties and named after Francis Marion.

  • Founded1822
  • County seatIndianapolis
  • Named forFrancis Marion
  • Land area397 sq mi + 6.4 sq mi water
  • Population977,203 2020 Census
  • Parcels mapped348,784 checked 15 October 2026
Open the free map Click any parcel in Marion County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

JohnsonHamiltonHancockHendricksMorgan Indianapolis Census outline · seat marked

Where it is

Marion 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 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 CountyMarion County Marion
Counties of Indiana · Marion highlighted

History

Formed in 1822 from Delaware County and Adams County

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

Marion County was created from the Delaware New Purchase (later Adams New Purchase) on April 1, 1822, with part of the Delaware New Purchase attached to Marion for administrative and judicial purposes. Between 1823 and 1830, Marion County lost its attachments to the Delaware New Purchase as new counties were created: Hamilton in 1823, Madison in 1823, and Boone in 1830. In 1831, Marion County gained a small area from Hendricks County.

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

  1. 1822
    Marion County created Marion created from Delaware New Purchase (later Adams New Purchase); part of Delaware New Purchase attached to Marion for administrative and judicial purposes.
    from Delawarefrom Adams
    · Ind. Acts 1821, 6th sess., ch. 72, secs. 1, 3, 7/pp. 135-136, 138
  2. 1823
    Lost territory Marion lost part of Delaware New Purchase (later Adams New Purchase) attachment to creation of Hamilton.
    to Delawareto Adamsto Hamilton
    · Ind. Acts 1822, 7th sess., ch. 52, secs. 1-2/p. 100
  3. 1823
    Lost territory Marion lost all of Delaware New Purchase (later Adams New Purchase) attachment to creation of Madison.
    to Delawareto Adamsto Madison
    · Ind. Acts 1822, 7th sess., ch. 50, sec. 1/p. 94
  4. 1824
    Boundary clarified Marion boundaries were clarified (no change).
    no change
    · Ind. Acts 1823, 8th sess., spec., ch. 30/p. 52
  5. 1825
    Changed Part of Delaware New Purchase (later Adams New Purchase) was attached to Marion for administrative and judicial purposes.
    DelawareAdams
    · Ind. Acts 1825, 9th sess., ch. 12/p. 15
  6. 1830
    Lost territory Marion lost Adams New Purchase attachment to creation of Boone.
    to Adamsto Boone
    · Ind. Acts 1829, 14th sess., ch. 24, secs. 1-2/p. 31
  7. 1831
    Gained territory Marion gained small area from Hendricks.
    from Hendricks
    · Ind. Rev. Laws 1831, ch. 19, secs. 17, 39, 57, 61-62/pp. 115, 121, 126-128

Land and parcels

What the maps cover in Marion

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

Marion by the Census

Population
977,203 2020 Census count
Housing units
436,998 2020 Census count
Land area
397 square miles
Water area
6.4 square miles
People per sq mi
2,464 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

Marion 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 Marion 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 Marion County

When was Marion County founded?
Marion County was founded in 1822, formed from Delaware County and Adams County, and named after Francis Marion.
What is the county seat of Marion County?
The county seat of Marion County is Indianapolis.
Is there an online parcel map for Marion County?
Yes. Marion County publishes a parcel map of 348,784 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Marion County's boundary or name changed?
Marion County was created in 1822 from Delaware County and Adams County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Adams County, Delaware County and Boone County.
Is my lot in a flood zone?
We do not have flood maps for Marion 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