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County · code 39139

Richland CountyOhio

Richland County is in Ohio and has its seat in Mansfield. It was formed in 1808 from Franklin County and Non-County Area 2.

  • Founded1808
  • County seatMansfield
  • Land area495 sq mi + 4.9 sq mi water
  • Population124,936 2020 Census
  • Parcels mapped73,408 checked 15 October 2026
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Updated

AshlandMorrowCrawfordKnox Mansfield Census outline · seat marked

Where it is

Richland 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 CountyClark 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 CountyRoss CountySandusky CountyScioto CountySeneca CountyShelby CountyStark CountySummit CountyTrumbull CountyTuscarawas CountyUnion CountyVan Wert CountyVinton CountyWarren CountyWashington CountyWayne CountyWilliams CountyWood CountyWyandot CountyRichland County Richland
Counties of Ohio · Richland highlighted

History

Formed in 1808 from Franklin County and Knox County

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

Richland County was initially not fully organized and was attached to Knox County for administrative and judicial purposes until 1813, when it was fully organized and detached from Knox. Over several decades, the county experienced boundary adjustments, losing land to Crawford, Ashland, and Morrow counties, while also gaining some territory back from Ashland and Morrow.

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

  1. 1808
    Richland County created Richland created from Franklin and Non-County Area 2; Richland not fully organized, attached to Knox for administrative and judicial purposes.
    from Franklinfrom Knox
    · Ohio Laws 1807, 6th assy., ch. 8, secs. 1-2, 7/pp. 21-24; Chase, 3:ch. 364, secs. 1-2, 7/pp. 2106-2107
  2. 1813
    Changed Richland fully organized, detached from Knox.
    Knox
    · Ohio Laws 1812, 11th assy., ch. 9/p. 21; Chase, 3:ch. 394/p. 2117
  3. 1845
    Lost territory Richland lost to Crawford.
    to Crawford
    · Ohio Laws 1844, 43d assy., loc., secs. 1-2/pp. 61-62
  4. 1846
    Lost territory Richland lost to creation of Ashland.
    to Ashland
    · Ohio Laws 1845, 44th assy., loc., secs. 1-2/pp. 172-173
  5. 1847
    Gained territory Richland gained from Ashland.
    from Ashland
    · Ohio Laws 1846, 45th assy., loc., p. 37
  6. 1848
    Lost territory Richland lost to creation of Morrow.
    to Morrow
    · Ohio Laws 1847, 46th assy., loc., secs. 1, 4/pp. 233-234
  7. 1849
    Gained territory Richland gained small area from Morrow.
    from Morrow
    · Ohio Laws 1848, 47th assy., loc., p. 362

Land and parcels

What the maps cover in Richland

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

Richland by the Census

Population
124,936 2020 Census count
Housing units
54,522 2020 Census count
Land area
495 square miles
Water area
4.9 square miles
People per sq mi
252 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

Richland 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 Richland County

When was Richland County founded?
Richland County was founded in 1808, formed from Franklin County and Knox County.
What is the county seat of Richland County?
The county seat of Richland County is Mansfield.
Is there an online parcel map for Richland County?
Yes. Richland County publishes a parcel map of 73,408 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Richland County's boundary or name changed?
Richland County was created in 1808 from Franklin County and Knox County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Ashland County, Morrow County and Crawford County.
Is my lot in a flood zone?
We do not have flood maps for Richland 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