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County · code 17189

Washington CountyIllinois

Washington County is a county in Illinois with its seat in Nashville. It was established on January 2, 1818, and named after George Washington.

  • Founded1818
  • County seatNashville
  • Named forGeorge Washington
  • Land area563 sq mi + 1.3 sq mi water
  • Population13,761 2020 Census
Open the free map Click any parcel in Washington County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ClintonPerryJefferson Nashville Census outline · seat marked

Where it is

Washington on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyWashington County Washington
Counties of Illinois · Washington highlighted

History

Formed in 1818 from St. Clair County

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

Washington County was formed in 1818 from St. Clair County, and named after George Washington. Nashville is the county seat.

Deeds and plats from before 1818 for land now in Washington County may have been recorded in St. Clair County.

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

  1. 1818
    Washington County created Washington created by Illinois Territory from St. Clair.
    from St. Clair
    · Ill. Terr. Laws, 312-314
  2. 1818
    Became part of Illinois Washington became a county in the state of Illinois when Illinois was created from Illinois Territory. · Terr. Papers U.S., 10:803; U.S. Stat., vol. 3, ch. 67 [1818], secs. 1-2, 7/pp. 428-429, 431, and res. 1 [1818]/p. 536
  3. 1824
    Lost territory Washington lost to creation of Clinton.
    to Clinton
    · Ill. Laws 1824-1825, pp. 27-30

Land and parcels

What the maps cover in Washington

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

Washington by the Census

Population
13,761 2020 Census count
Housing units
6,390 2020 Census count
Land area
563 square miles
Water area
1.3 square miles
People per sq mi
24 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.

Permits

Zoning and code

County government

See your own lot on these maps

Open Washington 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 Washington County

When was Washington County founded?
Washington County was founded in 1818, formed from St. Clair County, and named after George Washington.
What is the county seat of Washington County?
The county seat of Washington County is Nashville.
Is there an online parcel map for Washington County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Washington County's boundary or name changed?
Washington County was created in 1818 from St. Clair County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Clinton County.
Who issues septic and well permits in Washington County?
The county's page on septic systems and wells: Health department: septic and well.
Is my lot in a flood zone?
We do not have flood maps for Washington 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