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County · code 17003

Alexander CountyIllinois

Alexander County is a county in Illinois with its seat in Cairo. The county was formed on March 4, 1819.

  • Founded1819
  • County seatCairo
  • Named forWilliam M. Alexander
  • Land area235 sq mi + 17 sq mi water
  • Population5,240 2020 Census
  • Parcels mapped8,760 checked 15 October 2026
Open the free map Click any parcel in Alexander County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

PulaskiScott, MOUnionBallard, KYMississippi, MOCape Girardeau, MO Cairo Census outline · seat marked

Where it is

Alexander 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 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 CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyAlexander County Alexander
Counties of Illinois · Alexander highlighted

History

Formed in 1819 from Union County

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

Alexander County was created from Union County. The county was named after William M. Alexander. In 1843, Alexander County lost territory to the creation of Pulaski County.

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

  1. 1819
    Alexander County created Alexander created from Non-County Area 1 attached to Union.
    from Union
    · Ill. Laws 1819, pp. 113-114
  2. 1843
    Lost territory Alexander lost to creation of Pulaski.
    to Pulaski
    · Ill. Laws 1842-1843, pp. 99-101

Land and parcels

What the maps cover in Alexander

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

Alexander by the Census

Population
5,240 2020 Census count
Housing units
2,946 2020 Census count
Land area
235 square miles
Water area
17 square miles
People per sq mi
22 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

Alexander County's official site

We have found the county's site but not its offices yet; start there.

County government

  • County government

    The official website of Alexander County.

    alexandercounty.illinois.gov

See your own lot on these maps

Open Alexander 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 Alexander County

When was Alexander County founded?
Alexander County was founded in 1819, formed from Union County, and named after William M. Alexander.
What is the county seat of Alexander County?
The county seat of Alexander County is Cairo.
Is there an online parcel map for Alexander County?
Yes. A public source publishes a parcel map of 8,760 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Alexander County's boundary or name changed?
Alexander County was created in 1819 from Union County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Pulaski County.
Is my lot in a flood zone?
We do not have flood maps for Alexander 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