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County · code 39023

Clark CountyOhio

Clark County is in Ohio and was created in 1818 with Springfield as its county seat. The county was named after George Rogers Clark.

  • Founded1818
  • County seatSpringfield
  • Named forGeorge Rogers Clark
  • Land area397 sq mi + 5.6 sq mi water
  • Population136,001 2020 Census
  • Parcels mapped67,140 checked 15 October 2026
Open the free map Click any parcel in Clark County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ChampaignGreeneMadisonMontgomery Springfield Census outline · seat marked

Where it is

Clark on the map of Ohio

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

Adams CountyAllen CountyAshland CountyAshtabula CountyAthens CountyAuglaize CountyBelmont CountyBrown CountyButler CountyCarroll CountyChampaign CountyClermont CountyClinton CountyColumbiana CountyCoshocton CountyCrawford CountyCuyahoga CountyDarke CountyDefiance CountyDelaware CountyErie CountyFairfield CountyFayette CountyFranklin CountyFulton CountyGallia CountyGeauga CountyGreene CountyGuernsey CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHighland CountyHocking CountyHolmes CountyHuron CountyJackson CountyJefferson CountyKnox CountyLake CountyLawrence CountyLicking CountyLogan CountyLorain CountyLucas CountyMadison CountyMahoning CountyMarion CountyMedina CountyMeigs CountyMercer CountyMiami CountyMonroe CountyMontgomery CountyMorgan CountyMorrow CountyMuskingum CountyNoble CountyOttawa CountyPaulding CountyPerry CountyPickaway CountyPike CountyPortage CountyPreble CountyPutnam CountyRichland CountyRoss CountySandusky CountyScioto CountySeneca CountyShelby CountyStark CountySummit CountyTrumbull CountyTuscarawas CountyUnion CountyVan Wert CountyVinton CountyWarren CountyWashington CountyWayne CountyWilliams CountyWood CountyWyandot CountyClark County Clark
Counties of Ohio · Clark highlighted

History

Formed in 1818 from Champaign County, Greene County and Madison County

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

Clark County was created on March 1, 1818, from parts of Champaign, Greene, and Madison Counties. In 1827, Clark County exchanged territory with Madison County.

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

  1. 1818
    Clark County created Clark created from Champaign, Greene, and Madison.
    from Champaignfrom Greenefrom Madison
    · Ohio Laws 1817, 16th assy., ch. 14, secs. 1, 7/pp. 33, 36; Chase, 3:ch. 413/pp. 2125-2126
  2. 1819
    Boundary clarified Southern boundary of Clark was clarified (no change).
    no change
    · Ohio Laws 1818, 17th assy., ch. 35/p. 60; Chase 3:ch. 424/p. 2132
  3. 1821
    Boundary clarified Eastern boundary of Clark was clarified (no change).
    no change
    · Ohio Laws 1820, 19th assy., ch. 44/p. 73; Chase, 3:ch. 431/p. 2135
  4. 1827
    Exchanged territory Clark exchanged with Madison.
    with Madison
    · Ohio Laws 1826, 25th assy., gen., p. 24; Chase, 3:ch. 455/pp. 2141-2142

Land and parcels

What the maps cover in Clark

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

Clark by the Census

Population
136,001 2020 Census count
Housing units
60,987 2020 Census count
Land area
397 square miles
Water area
5.6 square miles
People per sq mi
343 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 Clark 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 Clark County

When was Clark County founded?
Clark County was founded in 1818, formed from Champaign County, Greene County and Madison County, and named after George Rogers Clark.
What is the county seat of Clark County?
The county seat of Clark County is Springfield.
Is there an online parcel map for Clark County?
Yes. A public source publishes a parcel map of 67,140 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Clark County's boundary or name changed?
Clark County was created in 1818 from Champaign County, Greene County and Madison County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Madison County.
Who issues building permits in Clark County?
The county's page on building permits: Permits Issued. Inside a city or town, ask that city first.
Who issues septic and well permits in Clark County?
The county's page on septic systems and wells: Environmental / Solid Waste.
Is my lot in a flood zone?
We do not have flood maps for Clark 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