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County · code 39083

Knox CountyOhio

Knox County is located in Ohio with Mount Vernon as its county seat. The county was founded on March 1, 1808, and named after Henry Knox.

  • Founded1808
  • County seatMount Vernon
  • Named forHenry Knox
  • Land area526 sq mi + 4.1 sq mi water
  • Population62,721 2020 Census
  • Parcels mapped42,110 checked 15 October 2026
Open the free map Click any parcel in Knox County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

LickingMorrowRichlandAshlandCoshoctonHolmes Mount Vernon Census outline · seat marked

Where it is

Knox 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 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 CountyKnox County Knox
Counties of Ohio · Knox highlighted

History

Formed in 1808 from Fairfield County, Franklin County and Richland County

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

Knox County was created from Fairfield, Franklin, and Richland Counties, with Richland initially attached for administrative purposes. Richland County was fully organized and detached from Knox in 1813. Knox County lost territory to the creation of Morrow County in 1848.

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

  1. 1808
    Knox County created Knox created from Fairfield, Franklin, and Non-County Area 2. Richland attached to Knox for administrative and judicial purposes.
    from Fairfieldfrom Franklinfrom Richland
    · 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.
    Richland
    · Ohio Laws 1812, 11th assy., ch. 9/p. 21; Chase, 3:ch. 394/p. 2117
  3. 1848
    Lost territory Knox lost to creation of Morrow.
    to Morrow
    · Ohio Laws 1847, 46th assy., loc., secs. 1, 4/pp. 233-234
  4. 1896
    Changed Legislature authorized Knox to gain from Holmes dependent on local referendum.
    Holmes
    · Ohio Laws 1896, 72d assy., reg. sess., p. 670

Land and parcels

What the maps cover in Knox

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

Knox by the Census

Population
62,721 2020 Census count
Housing units
25,797 2020 Census count
Land area
526 square miles
Water area
4.1 square miles
People per sq mi
119 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

Knox 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 Knox 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 Knox County

When was Knox County founded?
Knox County was founded in 1808, formed from Fairfield County, Franklin County and Richland County, and named after Henry Knox.
What is the county seat of Knox County?
The county seat of Knox County is Mount Vernon.
Is there an online parcel map for Knox County?
Yes. A public source publishes a parcel map of 42,110 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Knox County's boundary or name changed?
Knox County was created in 1808 from Fairfield County, Franklin County and Richland County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Holmes County, Morrow County and Richland County.
Is my lot in a flood zone?
We do not have flood maps for Knox 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