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Illinois Genealogy Resources

County Resources

Current Illinois Counties with (County Seat)

Adams (Quincy) Alexander (Cairo)
Bond (Greenville) Boone (Belvidere)
Bureau (Princeton) Calhoun (Hardin)
Carroll (Mount Carroll) Cass (Virginia)
Champaign (Urbana) Christian (Taylorville)
Clark (Marshall) Clay (Louisville)
Clinton (Carlyle) Coles (Charleston)
Cook (Chicago) Crawford (Robinson)
Cumberland (Toledo) DeKalb (Sycamore)
De Witt (Clinton) Douglas (Tuscola)
DuPage (Wheaton) Edgar (Paris)
Edwards (Albion) Effingham (Effingham)
Fayette (Vandalia) Ford (Paxton)
Franklin (Benton) Fulton (Lewistown)
Gallatin (Shawneetown) Greene (Carrollton)
Grundy (Morris) Hamilton (McLeansboro)
Hardin (Elizabethtown) Henderson (Oquawka)
Henry (Cambridge) Iroquois (Watseka)
Jackson (Murphysboro) Jasper (Newton)
Jefferson (Mount Vernon) Jersey (Jerseyville)
Jo Daviess  
Johnson (Vienna) Kane (Geneva)
Kankakee (Kankakee) Kendall (Yorkville)
Knox (Galesburg) Lake (Waukegan)
LaSalle (Ottawa) Lawrence (Lawrenceville)
Lee (Dixon) Livingston (Pontiac)
Logan (Lincoln) McDonough (Macomb)
McHenry (Woodstock) McLean (Bloomington)
Macon (Decatur) Macoupin (Carlinville)
Madison (Edwardsville) Marion (Salem)
Marshall (Lacon) Mason (Havana)
Massac (Metropolis) Menard (Petersburg)
Mercer (Aledo) Monroe (Waterloo)
Montgomery (Hillsboro) Morgan (Jacksonville)
Moultrie (Sullivan) Ogle (Oregon)
Peoria (Peoria) Perry (Pinckneyville)
Piatt (Monticello) Pike (Pittsfield)
Pope (Golconda) Pulaski (Mound City)
Putnam (Hennepin) Randolph (Chester)
Richland (Olney) Rock (Rock Island)
St. Clair (Belleville) Saline (Harrisburg)
Sangamon (Springfield) Schuyler (Rushville)
Scott (Winchester) Shelby (Shelbyville)
Stark (Toulon) Stephenson
  Tazewell (Pekin)
Union (Jonesboro) Vermilion (Danville)
Wabash (Mount Carmel) Warren (Monmouth)
Washington (Nashville) Wayne (Fairfield)
White (Carmi) Whiteside
Will (Joliet) Williamson (Marion)
Winnebago (Rockford) Woodford (Eureka)
Dane (defunct - renamed in 1840 to current Christian County) The original Knox County became extinct with formation of Illinois Territory in 1809 and became Knox County, Indiana.