County Resources
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Current Illinois
Counties with (County Seat)
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| Adams (Quincy) |
Alexander (Cairo) |
| Bond (Greenville) |
Boone (Belvidere) |
| Bureau (Princeton) |
Calhoun (Hardin) |
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Carroll (Mount Carroll) |
Cass (Virginia) |
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Champaign (Urbana) |
Christian (Taylorville) |
| Clark (Marshall) |
Clay (Louisville) |
| Clinton (Carlyle) |
Coles (Charleston) |
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Cook (Chicago) |
Crawford (Robinson) |
| Cumberland (Toledo) |
DeKalb (Sycamore) |
| De Witt (Clinton) |
Douglas (Tuscola) |
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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) |
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Jo Daviess
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| Johnson (Vienna) |
Kane (Geneva) |
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Kankakee (Kankakee) |
Kendall (Yorkville) |
| Knox (Galesburg) |
Lake (Waukegan) |
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LaSalle (Ottawa) |
Lawrence (Lawrenceville) |
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Lee (Dixon) |
Livingston (Pontiac) |
| Logan (Lincoln) |
McDonough (Macomb) |
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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) |
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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. |
- Carpentier, Charles F. Counties of Illinois:
Their Origin and Evolution With Twenty-Three Maps .
. . [Springfield, Ill.: Secretary of State. State
Journal Co., 1919.]
- Cook County
Government - County Board, County Agencies and
Officials. The County Clerk records all births and
deaths.
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County and Township Fact Sheets - Includes photos of
each county court house.
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County Court House Addresses
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County Histories and Genealogical Societies
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County Selection List - On a Clickable Map
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County Selection List - With formation date, county
seat & Mailing List Info
- DuMelle, Grace. Finding Your Chicago Ancestors: A
Beginner's Guide to Family History in the City and Cook
County. Chicago: Lake Claremont Press, 2005.
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Homepage of Illinois Counties
- "Illinois
County Histories at the Illinois State Library,"
Illinois Libraries 82 (2000): 92-141.
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Illinois County Boundaries 1790 to Present by Michael L.
Hebert
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Illinois County Maps
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Illinois Family History Research Place Names of Each
Illinois County
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Illinois Family History Research Place Names of the 33
Western Counties
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Illinois Family History Research Place Names of the
Northeast 25 Counties
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Illinois Family History Research Place Names of the
Southeast 44 Counties
- Illinois Trails
History and Genealogy
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Map showing the Illinois county boundary changes from
1790 to present
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Name Index to Illinois Local Governments.
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Population of Illinois by Counties: 1810 to 2000
- Secretary of State (Illinois). Origin and
Evolution of Illinois Counties. Springfield, IL.,
2003. Many versions of this publication exist. An online
version without legal and boundary descriptions and
derived from an earlier edition of the book is Michael
L. Hebert.
Illinois County Boundaries: 1790-Present.
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