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This article is about the mid-western state of the United States. For other uses, see Illinois (disambiguation).

United States  Gotoarrow.png  Illinois
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Illinois is a state in the Midwestern United States. It was organized as a territory in 1809, and became a state in 1818, the 21st to join the Union.

The European settlement of Illinois began in 1699 when the French established Cahokia, and a few years later, Kaskaskia. Following the French and Indian War, the Illinois area was ceded to the British in 1763. Early settlers came to Southern Illinois by the Ohio River, from North Carolina, Tennessee, Virginia, Kentucky, Maryland and Pennsylvania.

With the opening of the Erie Canal in 1825, settlers began coming from New England states, settling the Northern part of Illinois. Thousands of Irish, southern European, and German immigrants settled around the Great Lakes in the 1830’s and 40’s, drawn by industrial job growth.

ISGSlogo.jpg This user is a member of Illinois State Genealogical Society, an organization that has adopted some pages in the wiki.


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Counties of Illinois

Click on the map below to go to a county page. Hover over a county to see its name. To see a larger version of the map, click here.

Jo Daviess CountyStephenson CountyWinnebago CountyBoone CountyMcHenry CountyLake CountyCarroll CountyOgle CountyDeKalb CountyKane CountyCook CountyDuPage CountyWhiteside CountyLee CountyRock Island CountyMercer CountyHenry CountyBureau CountyLaSalle CountyKendall CountyGrundy CountyWill CountyKankakee CountyPutnam CountyLivingston CountyFord CountyIroquois CountyHenderson CountyWarren CountyKnox CountyStark CountyMarshall CountyPeoria CountyWoodford CountyHancock CountyMcDonough CountyFulton CountyTazewell CountyMcLean CountyAdams CountySchuyler CountyBrown CountyCass CountyMenard CountyLogan CountyDeWitt CountyPiatt CountyChampaign CountyPike CountyMorgan CountyScott CountySangamon CountyMacon CountyVermilion CountyDouglas CountyMoultrie CountyCalhoun CountyGreene CountyMacoupin CountyMontgomery CountyChristian CountyShelby CountyColes County, IllinoisEdgar CountyJersey CountyMadison CountyBond CountyFayette CountyCumberland CountyClark CountyEffingham CountyJasper CountyCrawford CountySt. Clair CountyClinton CountyMarion CountyClay CountyRichland CountyLawrence CountyMonroe CountyWashington CountyJefferson CountyWayne CountyEdwards CountyWabash CountyRandolph CountyPerry CountyFranklin CountyHamilton CountyWhite CountyJackson CountyWilliamson CountySaline CountyGallatin CountyUnion CountyJohnson CountyPope CountyHardin CountyAlexander CountyPulaski CountyMassac CountyMason CountyIllinois-county-map.gif
Illinois Counties
Adams • Alexander • Bond • Boone • Brown • Bureau • Calhoun • Carroll • Cass • Champaign • Christian • Clark • Clay • Clinton • Coles • Cook • Crawford • Cumberland • DeKalb • DeWitt • Douglas • DuPage • Edgar • Edwards • Effingham • Fayette • Ford • Franklin • Fulton • Gallatin • Greene • Grundy • Hamilton • Hancock • Hardin • Henderson • Henry • Iroquois • Jackson • Jasper • Jefferson • Jersey • Jo Daviess • Johnson • Kane • Kankakee • Kendall • Knox • Lake • LaSalle • Lawrence • Lee • Livingston • Logan • Macon • Macoupin • Madison • Marion • Marshall • Mason • Massac • McDonough • McHenry • McLean • Menard • Mercer • Monroe • Montgomery • Morgan • Moultrie • Ogle • Peoria • Perry • Piatt • Pike • Pope • Pulaski • Putnam • Randolph • Richland • Rock Island • Saline • Sangamon • Schuyler • Scott • Shelby • St. Clair • Stark • Stephenson • Tazewell • Union • Vermilion • Wabash • Warren • Washington • Wayne • White • Whiteside • Will • Williamson • Winnebago • Woodford

For an alphabetical listing of Illinois counties, see Illinois County Creation Dates and Parent Counties.

Major Repositories

Newberry Library · Illinois State Archives · Illinois Regional Archives Depository (IRAD) · Illinois State Library · Illinois State Historical Library (ISHL) · National Archives Great Lakes Region (Chicago) · Allen County Public Library

Migration Routes

Illinois River · Mississippi River · Ohio River · Wabash River · Lake Michigan · Buffalo Trace · Chicago-Dubuque Highway · Chicago-Kaskaskia Road · Detroit-Chicago Road · Kellog Trail · Mihoaukee Trail · Nashville-Saline River Trail · National Road (or Cumberland Road) · Old Chicago Road · Pecatonica Trail · Russellville-Shawneetown Trail · Illinois and Michigan Canal · Santa Fe Railway · Great Northern Railway (U.S.)

Featured Content

Illinois Collection Apr 2011 with search box.png Historical Record Collections includes nine collections of Illinois records as of April 2011. To access Illinois-specific collections, go to and click on USA, Canada and Mexico under Browse by Location. Type "Illinois" (without quote marks) in the Search box in the upper left corner.

Illinois Research Topics

The Illinois moderator is Lise Embley. Please contact the FamilySearch Wiki administrator if you would like to be the assistant moderator for Illinois.