Illinois, United States Genealogy

''This page is about a Midwest state of the United States. For other uses, see Illinois (disambiguation)''. United States Illinois

Unique genealogical features:


 * Illinois Regional Archives Depositories (IRAD)
 * Newberry Library, Chicago
 * Learn Chicago big city research: history, places, and resources
 * FamilySearch Historical Record Collections has 10 large IL databases; 7 indexed.

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 •  Extinct or Renamed Counties:  Dane •  Illinois Country •  Knox (1790-1809)

See also Illinois County Creation Dates and Parent Counties.

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.



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.)· Illinois Central Railroad

Research Tools

 * Cook County Genealogy Online is a free (requires registration) index of births 1871-1936, marriages 1856-1961, and deaths 1871-1991.
 * Cook County Birth Registers, 1871-1915 Index and 55,233 images. Search fields: first name, last name, place, year, parents' names.
 * Cook County Birth Certificates, 1878-1922 Index and 1,434,175 images. Search fields: first name, last name, place, year, parents' names.
 * Illinois County Marriages, 1810-1934 Index 9 percent complete; no images. Counties: Adams, Alexander, Bond, Boone, Brown, Champaign, Christian, Clark and Clay.
 * Illinois Statewide Marriage Index, 1763-1900 Free statewide or countywide searches by groom's name, bride's name or both.
 * Cook County Marriages, 1871-1920 Index and images. Search fields: first name, last name, place, year, spouse's names.
 * Illinois Statewide Death Index 1878-1916 Free statewide or countywide name searches; no images. This is an on-going project.
 * Cook County Deaths, 1878-1922 Index and 1,429,365 images. Search fields: first name, last name, place, year, spouse's name, parents' names.
 * Illinois Deaths and Stillbirths, 1916-1945 Index only. Search fields: first name, last name, place, year, spouse's and parents' names.
 * Illinois State Census, 1855 Index and images. Search fields: first name, last name, place, spouse's and parents' names.
 * Illinois, Diocese of Belleville, Catholic Parish Records, 1729-1956 34,135 images of baptisms, communions, confirmations to 1907; marriages to 1930; deaths to 1956. Includes images of indexes in some volumes.
 * Northern District Naturalization Index, 1840-1950 1,493,775 petition index card images in Soundex number order for parts of IL, IN, WI, &amp; IA.
 * Illinois Probate Records, 1819-1970 427,770 images of wills, indexes and other estate documents.
 * Illinois GenWeb Offers free statewide and county resources.
 * Illinois Ancestors links to Illinois topics and many county records

Wiki articles describing online collections are found at:


 * Illinois 1855 State Census (FamilySearch Historical Records)
 * Illinois 1865 State Census (FamilySearch Historical Records)
 * Illinois Belleville Catholic Church Records, (FamilySearch Historical Records)
 * Illinois Deaths and Stillbirths (FamilySearch Historical Records)
 * Illinois County Marriage Records (FamilySearch Historical Recoords)
 * Illinois, Macon County, Decatur Public Library Collections (FamilySearch Historical Records)
 * Illinois, Northern District, Indexes to Naturalization Records (FamilySearch Historical Records)
 * Illinois, Pekin Public Library Obituaries (FamilySeavch Historical Records)
 * Illinois Probate Books (FamilySearch Historical Records)