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County · code 17001

Adams CountyIllinois

Adams County is in Illinois, with its seat in Quincy, and was created on January 13, 1825.

  • Founded1825
  • County seatQuincy
  • Named forJohn Quincy Adams
  • Land area855 sq mi + 16 sq mi water
  • Population65,737 2020 Census
  • Parcels mapped38,835 checked 15 October 2026
Open the free map Click any parcel in Adams County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

HancockBrownMarion, MOPikeLewis, MO Quincy Census outline · seat marked

Where it is

Adams on the map of Illinois

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

Alexander 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 CountyAdams County Adams
Counties of Illinois · Adams highlighted

History

Formed in 1825 from Pike County and Hancock County

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

Adams County was created on January 13, 1825, from Pike County and Non-County Area 3, with Hancock County attached for county purposes. Hancock County was fully organized and detached from Adams on August 3, 1829. Adams County lost territory to the creation of Marquette (later Highland, an extinct county) in 1843, and to Highland again in 1847, but regained all of Highland's territory on December 31, 1848, when Highland failed to become fully organized.

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

  1. 1825
    Adams County created Adams created from Pike and Non-County Area 3 attached to Pike. Hancock attached to Adams "for county purposes."
    from Pikefrom Hancock
    · Ill. Laws 1824-1825, pp. 85-87, 92-96
  2. 1829
    Changed Hancock fully organized, detached from Adams.
    Hancock
    · Scofield, 679
  3. 1837
    Changed Adams boundaries were extended to the middle of the Mississippi River. · Ill. Laws 1836-1837, pp. 91-92
  4. 1843
    Lost territory Adams lost to creation of Marquette (later Highland, extinct).
    to Marquetteto Highland
    · Ill. Laws 1842-1843, pp. 77-83
  5. 1847
    Lost territory Adams lost to Highland (extinct).
    to Highland
    · Ill. Laws 1846-1847, gen., pp. 38-41
  6. 1848
    Gained territory By 31 December 1848, Adams gained all of Highland (extinct) when Highland failed to become fully organized as a county; Highland eliminated.
    from Highland
    · Wilcox, David F., 1:119-120

Land and parcels

What the maps cover in Adams

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

Adams by the Census

Population
65,737 2020 Census count
Housing units
30,235 2020 Census count
Land area
855 square miles
Water area
16 square miles
People per sq mi
77 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

Adams 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 Adams County

When was Adams County founded?
Adams County was founded in 1825, formed from Pike County and Hancock County, and named after John Quincy Adams.
What is the county seat of Adams County?
The county seat of Adams County is Quincy.
Is there an online parcel map for Adams County?
Yes. Adams County publishes a parcel map of 38,835 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Adams County's boundary or name changed?
Adams County was created in 1825 from Pike County and Hancock County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Highland County, Hancock County and Marquette County.
Is my lot in a flood zone?
We do not have flood maps for Adams 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