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County · code 39081

Jefferson CountyOhio

Jefferson County is a county in Ohio with its seat in Steubenville, formed in 1797.

  • Founded1797
  • County seatSteubenville
  • Named forThomas Jefferson
  • Land area408 sq mi + 2.8 sq mi water
  • Population65,249 2020 Census
  • Parcels mapped58,441 checked 14 October 2026
Open the free map Click any parcel in Jefferson County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Brooke, WVHancock, WVOhio, WVHarrisonCarrollColumbianaBelmont Steubenville Census outline · seat marked

Where it is

Jefferson 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 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 CountyJefferson County Jefferson
Counties of Ohio · Jefferson highlighted

History

Formed in 1797 from Washington County

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

Jefferson County was created by the Northwest Territory from Washington County and part of the Western Reserve. The county was named after Thomas Jefferson. Jefferson became a county in the state of Ohio on March 1, 1803, after losing and gaining territory multiple times through the creation of neighboring counties including Trumbull, Belmont, Columbiana, Tuscarawas, Harrison, and Carroll.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1797
    Jefferson County created Jefferson created by the Northwest Territory from Washington and part of the Western Reserve. This implicit challenge to Connecticut's authority in the Western Reserve went unanswered.
    from Washington
    · Terr. Papers U.S., 2:617-618; Chase, 3:ch. 334/p. 2096
  2. 1799
    Gained territory Jefferson gained from Washington.
    from Washington
    · Chase, 3:ch. 342/p. 2098
  3. 1800
    Lost territory Jefferson lost to creation of Trumbull.
    to Trumbull
    · Terr. Papers U.S., 3:525; Chase, 3:ch. 338/p. 2097
  4. 1801
    Lost territory Jefferson lost to creation of Belmont.
    to Belmont
    · Terr. Papers U.S., 3:528; Chase, 3:ch. 341/p. 2098
  5. 1803
    Became part of Ohio Jefferson became a county in the state of Ohio. · U.S. Stat., vol. 2, ch. 40 [1802], secs. 1-3/pp. 173-174; Van Zandt, 112
Show all 12 changes (7 more)
  1. 1797
    Jefferson County created Jefferson created by the Northwest Territory from Washington and part of the Western Reserve. This implicit challenge to Connecticut's authority in the Western Reserve went unanswered.
    from Washington
    · Terr. Papers U.S., 2:617-618; Chase, 3:ch. 334/p. 2096
  2. 1799
    Gained territory Jefferson gained from Washington.
    from Washington
    · Chase, 3:ch. 342/p. 2098
  3. 1800
    Lost territory Jefferson lost to creation of Trumbull.
    to Trumbull
    · Terr. Papers U.S., 3:525; Chase, 3:ch. 338/p. 2097
  4. 1801
    Lost territory Jefferson lost to creation of Belmont.
    to Belmont
    · Terr. Papers U.S., 3:528; Chase, 3:ch. 341/p. 2098
  5. 1803
    Became part of Ohio Jefferson became a county in the state of Ohio. · U.S. Stat., vol. 2, ch. 40 [1802], secs. 1-3/pp. 173-174; Van Zandt, 112
  6. 1803
    Lost territory Jefferson lost to creation of Columbiana.
    to Columbiana
    · Ohio Laws 1803, 1st assy., ch. 6/p. 15; Chase, 3:ch. 346/p. 2100
  7. 1807
    Gained territory Jefferson gained from Washington.
    from Washington
    · Ohio Laws 1806, 5th assy., ch. 37/p. 104; Ohio Laws 1826, 25th assy., gen., p. 15; Chase, 3:ch. 358/p. 2104 and ch. 454/p. 2141
  8. 1809
    Lost territory Jefferson lost to Tuscarawas.
    to Tuscarawas
    · Ohio Laws 1808, 7th assy., ch. 18/p. 142; Chase, 3:ch. 374/p. 2110
  9. 1813
    Lost territory Jefferson lost to creation of Harrison.
    to Harrison
    · Ohio Laws 1812, 11th assy., ch. 5., sec. 1/p. 11 and ch. 11/p. 26; Chase, 3:chs. 393, 395/pp. 2116-2117
  10. 1833
    Gained territory Jefferson gained from Columbiana, lost to creation of Carroll.
    from Columbianafrom Carroll
    · Ohio Laws 1832, 31st assy., gen., p. 8; Chase, 3:ch. 478/pp. 2146-2147
  11. 1834
    Boundary clarified Boundary between Jefferson and Columbiana was clarified (no change).
    with Columbianano change
    · Ohio Laws 1833, 32d assy., loc., p. 139
  12. 1835
    Boundary clarified Boundary between Jefferson and Carroll was clarified (no change).
    with Carrollno change
    · Ohio Laws 1834, 33d assy., loc., p. 118

Land and parcels

What the maps cover in Jefferson

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

Jefferson by the Census

Population
65,249 2020 Census count
Housing units
31,125 2020 Census count
Land area
408 square miles
Water area
2.8 square miles
People per sq mi
160 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

Jefferson 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 Jefferson County

When was Jefferson County founded?
Jefferson County was founded in 1797, formed from Washington County, and named after Thomas Jefferson.
What is the county seat of Jefferson County?
The county seat of Jefferson County is Steubenville.
Is there an online parcel map for Jefferson County?
Yes. Ohio Geographically Referenced Information Program (OGRIP, Ohio DAS) statewide compilation of county auditor parcels publishes a parcel map of 58,441 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Jefferson County's boundary or name changed?
Jefferson County was created in 1797 from Washington County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Columbiana County, Washington County and Belmont County.
Is my lot in a flood zone?
We do not have flood maps for Jefferson 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