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County · code 39145

Scioto CountyOhio

Scioto County is located in Ohio and has its seat in Portsmouth. The county was formed on May 1, 1803, from Adams County and named after the Scioto River.

  • Founded1803
  • County seatPortsmouth
  • Named forScioto River, Ohio
  • Land area610 sq mi + 6.2 sq mi water
  • Population74,008 2020 Census
  • Parcels mapped58,199 checked 15 October 2026
Open the free map Click any parcel in Scioto County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Greenup, KYPikeJacksonLewis, KYAdamsLawrence Portsmouth Census outline · seat marked

Where it is

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

History

Formed in 1803 from Adams County

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

Scioto County was created from Adams County on May 1, 1803, and gained territory from Gallia County in 1804. Between 1815 and 1816, the county lost land to the creation of Pike, Lawrence, and Jackson counties, though Lawrence was later reorganized and adjustments to Scioto's boundaries continued through the 1820s.

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

  1. 1803
    Scioto County created Scioto created from Adams.
    from Adams
    · Ohio Laws 1803, 1st assy., ch. 3/p. 8; Chase, 3:ch. 344/p. 2099
  2. 1804
    Gained territory Scioto gained from Gallia.
    from Gallia
    · Ohio Laws 1804, 3d assy., ch. 74/p. 294; Chase, 3:ch. 354/p. 2103
  3. 1815
    Lost territory Scioto lost to creation of Pike.
    to Pike
    · Ohio Laws 1814, 13th assy., ch. 16, secs. 1, 6/pp. 52, 55; Chase 3:ch. 399/pp. 2118-2119
  4. 1815
    Lost territory Scioto lost to creation of Lawrence; Lawrence not fully organized, part attached to Scioto for administrative and judicial purposes.
    to Lawrence
    · Ohio Laws 1815, 14th assy., ch. 8/p. 22; Chase, 3:ch. 403/p. 2121
  5. 1816
    Lost territory Scioto lost to creation of Jackson.
    to Jackson
    · Ohio Laws 1815, 14th assy., ch. 25, secs. 1, 5/pp. 112, 115; Chase, 3:ch. 404/pp. 2121-2122
Show all 8 changes (3 more)
  1. 1803
    Scioto County created Scioto created from Adams.
    from Adams
    · Ohio Laws 1803, 1st assy., ch. 3/p. 8; Chase, 3:ch. 344/p. 2099
  2. 1804
    Gained territory Scioto gained from Gallia.
    from Gallia
    · Ohio Laws 1804, 3d assy., ch. 74/p. 294; Chase, 3:ch. 354/p. 2103
  3. 1815
    Lost territory Scioto lost to creation of Pike.
    to Pike
    · Ohio Laws 1814, 13th assy., ch. 16, secs. 1, 6/pp. 52, 55; Chase 3:ch. 399/pp. 2118-2119
  4. 1815
    Lost territory Scioto lost to creation of Lawrence; Lawrence not fully organized, part attached to Scioto for administrative and judicial purposes.
    to Lawrence
    · Ohio Laws 1815, 14th assy., ch. 8/p. 22; Chase, 3:ch. 403/p. 2121
  5. 1816
    Lost territory Scioto lost to creation of Jackson.
    to Jackson
    · Ohio Laws 1815, 14th assy., ch. 25, secs. 1, 5/pp. 112, 115; Chase, 3:ch. 404/pp. 2121-2122
  6. 1817
    Lost territory Scioto lost small area to Lawrence; Lawrence fully organized, detached from Scioto.
    to Lawrence
    · Ohio Laws 1816, 15th assy., ch. 6/p. 6; Chase, 3:ch. 407/p. 2123
  7. 1818
    Gained territory Scioto gained from Lawrence.
    from Lawrence
    · Ohio Laws 1817, 16th assy., ch. 34/p. 77; Chase 3:ch. 419/p. 2129
  8. 1826
    Gained territory Scioto gained from Lawrence.
    from Lawrence
    · Ohio Laws 1825, 24th assy., gen., p. 76; Chase, 3:ch. 451/p. 2141

Land and parcels

What the maps cover in Scioto

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

Scioto by the Census

Population
74,008 2020 Census count
Housing units
33,108 2020 Census count
Land area
610 square miles
Water area
6.2 square miles
People per sq mi
121 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

Scioto 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 Scioto County

When was Scioto County founded?
Scioto County was founded in 1803, formed from Adams County, and named after Scioto River, Ohio.
What is the county seat of Scioto County?
The county seat of Scioto County is Portsmouth.
Is there an online parcel map for Scioto County?
Yes. Scioto County publishes a parcel map of 58,199 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Scioto County's boundary or name changed?
Scioto County was created in 1803 from Adams County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Lawrence County, Gallia County and Jackson County.
Is my lot in a flood zone?
We do not have flood maps for Scioto 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