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County · code 39101

Marion CountyOhio

Marion County is a county in Ohio with its seat in Marion. It was created in 1820 from Delaware County and covers 403.8 square miles.

  • Founded1820
  • County seatMarion
  • Named forFrancis Marion
  • Land area404 sq mi + 0.4 sq mi water
  • Population65,359 2020 Census
  • Parcels mapped34,804 checked 14 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

WyandotDelawareCrawfordMorrowHardin Marion Census outline · seat marked

Where it is

Marion on the map of Ohio

Ohio has 88 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Ohio · Marion highlighted

History

Formed in 1820 from Delaware County

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

Marion County was created on April 1, 1820, from Delaware County, initially attached to Delaware for administrative purposes, and named after Francis Marion. It was fully organized in 1824 when Crawford County was attached to it for judicial purposes, but Crawford became fully organized and detached in 1826. In 1845, Marion County lost territory to the creation of Wyandot County and to Crawford County, then gained from Delaware in 1848 but lost territory to the creation of Morrow County.

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

  1. 1820
    Marion County created Marion created from Non-County Area 5 attached to Delaware; Marion not fully organized, attached to Delaware for administrative and judicial purposes.
    from Delaware
    · Ohio Laws 1819, 18th assy., loc., ch. 37, secs. 1-2/p. 91; Chase, 3:ch. 429/pp. 2134-2135
  2. 1824
    Changed Marion fully organized, detached from Delaware. Crawford detached from Delaware, attached to Marion "for judicial purposes."
    DelawareCrawford
    · Ohio Laws 1823, 22d assy., loc., ch. 33/p. 48; Chase, 3:ch. 441/p. 2137
  3. 1826
    Changed Crawford fully organized, detached from Marion.
    Crawford
    · Ohio Laws 1825, 24th assy., gen., p. 46; Chase, 3:ch. 450/pp. 2140-2141
  4. 1845
    Lost territory Marion lost to creation of Wyandot and lost to Crawford.
    to Wyandotto Crawford
    · Ohio Laws 1844, 43d assy., loc., secs. 1-2, 4/pp. 61-62
  5. 1848
    Gained territory Marion gained from Delaware, lost to creation of Morrow.
    from Delawarefrom Morrow
    · Ohio Laws 1847, 46th assy., loc., secs. 1, 4/pp. 233-234

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
65,359 2020 Census count
Housing units
27,348 2020 Census count
Land area
404 square miles
Water area
0.4 square miles
People per sq mi
162 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

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 1820, formed from Delaware County, and named after Francis Marion.
What is the county seat of Marion County?
The county seat of Marion County is Marion.
Is there an online parcel map for Marion County?
Yes. A public source publishes a parcel map of 34,804 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 1820 from Delaware County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Crawford County, Delaware County and Morrow County.
Who issues building permits in Marion County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
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