IPUB11 & NIHL - County Table
IL - County Established Area Sq Miles County Seat 2010 Population NIHL - County NIHL - County Website
Adams 1/13/1825 856.7 Quincy 67103

Alexander 3/4/1819 236.4 Cairo 8238

Bond 1/4/1817 380.2 Greenville 17768

Boone 3/4/1837 281.6 Belvidere 54165 Boone http://www.boonecountyil.org/
Brown 2/1/1839 305.7 Mount Sterling 6937

Bureau 2/28/1837 868.6 Princeton 34978 Bureau http://www.bureaucounty-il.gov/
Calhoun 1/10/1825 253.8 Hardin 5089

Carroll 2/22/1839 444.2 Mount Carroll 15387 Carroll http://www.carroll-county.net/
Cass 3/3/1837 376 Virginia 13642

Champaign 2/20/1833 997.2 Urbana 201081

Christian 2/15/1839 709.1 Taylorville 34800

Clark 3/22/1819 501.5 Marshal 16335

Clay 12/23/1824 469.3 Louisville 13815

Clinton 12/27/1824 474.3 Carlyle 37762

Coles 12/25/1830 508.3 Charleston 53873

Cook 1/15/1831 945.7 Chicago 5194675 Cook http://www.cookcountyil.gov/
Crawford 12/31/1816 443.6 Robinson 19817

Cumberland 3/2/1843 346 Toledo 11048

DeKalb 3/4/1837 634.2 Sycamore 105160 DeKalb http://dekalbcounty.org/
DeWitt 3/1/1839 397.6 Clinton 16561

Douglas 2/8/1859 416.9 Tuscola 19980

DuPage 2/9/1839 334.4 Wheaton 916924 DuPage http://www.co.dupage.il.us/
Edgar 1/3/1823 623.6 Paris 18576

Edwards 11/28/1814 222.4 Albion 6721

Effingham 2/15/1831 478.7 Effingham 34242

Fayette 2/14/1821 716.5 Vandalia 22140

Ford 2/17/1859 485.9 Paxton 14081

Franklin 1/2/1818 412.1 Benton 39561

Fulton 1/28/1823 865.7 Lewistown 37069

Gallatin 9/14/1812 323.7 Shawneetown 5589

Greene 1/20/1821 543.1 Carrollton 13886

Grundy 2/17/1841 420.1 Morris 50063 Grundy http://www.grundyco.org/
Hamilton 2/8/1821 435.2 McLeansboro 8457

Hancock 1/13/1825 794.7 Carthage 19104

Hardin 3/2/1839 178.3 Elizabethtown 4320

Henderson 1/20/1841 378.8 Oquawka 7331

Henry 1/13/1825 823.3 Cambridge 50486 Henry http://www.henrycty.com/
Iroquois 2/26/1833 1116.5 Watseka 29718

Jackson 1/10/1816 588.1 Murphysboro 60218

Jasper 2/15/1831 494.4 Newton 9698

Jefferson 3/26/1819 571.1 Mt Vernon 38827

Jersey 2/28/1839 369.2 Jerseyville 22985

Jo Daviess 2/17/1827 601.2 Galena 22678 Jo Daviess http://www.jodaviess.org/
Johnson 9/14/1812 346 Vienna 12582

Kane 1/16/1836 520.7 Geneva 515269 Kane http://www.countyofkane.org/Pages/default.aspx
Kankakee 2/11/1853 677.5 Kankakee 113449 Kankakee http://www.co.kankakee.il.us/
Kendall 2/19/1841 320.7 Yorkville 114736 Kendall http://www.co.kendall.il.us/
Knox 1/13/1825 716.3 Galesburg 52919

Lake 3/1/1839 447.8 Waukegan 703462 Lake http://www.lakecountyil.gov/Pages/default.aspx
LaSalle 1/15/1831 1135 Ottawa 113924 LaSalle http://www.lasallecounty.org/frm_set_index.htm
Lawrence 1/16/1821 372 Lawrenceville 16833

Lee 2/27/1839 725.4 Dixon 36031 Lee http://leecountyil.com/
Livingston 2/27/1837 1043.8 Pontiac 38950

Logan 2/15/1839 618.2 Lincoln 30305

Macon 1/19/1829 580.6 Decatur 110768

Macoupin 1/17/1829 863.7 Carlinville 47765

Madison 9/14/1812 725.1 Edwardsville 269282

Marion 1/24/1823 572.3 Salem 39437

Marshall 1/19/1839 386.1 Lacon 12640

Mason 1/20/1841 539 Havana 14666

Massac 2/8/1843 239.1 Metropolis 15429

McDonough 1/25/1826 589.3 Macomb 32612

McHenry 1/16/1836 604.1 Woodstock 308760 McHenry https://www.co.mchenry.il.us/
McLean 12/25/1830 1183.6 Bloomington 169572

Menard 2/15/1839 314.3 Petersburg 12705

Mercer 1/13/1825 561 Aledo 16434 Mercer http://www.mercercountyil.org/
Monroe 1/6/1816 388.3 Waterloo 32957

Montgomery 2/12/1821 703.8 Hillsboro 30104

Morgan 1/31/1823 568.8 Jacksonville 35547

Moultrie 2/16/1843 335.6 Sullivan 14846

Ogle 1/16/1836 758.9 Oregon 53497 Ogle http://oglecounty.org/
Peoria 1/13/1825 619.6 Peoria 186494

Perry 1/29/1827 441 Pinckneyville 22350

Piatt 1/27/1841 440 Monticello 16729

Pike 1/31/1821 830.3 Pittsfield 16430

Pope 1/10/1816 370.9 Golconda 4470

Pulaski 3/3/1843 200.8 Mound City 6161

Putnam 1/13/1825 159.8 Hennepin 6006 Putnam http://www.co.putnam.il.us/
Randolph 10/5/1795 578.4 Chester 33476

Richland 2/24/1841 360.2 Olney 16233

Rock Island 2/9/1831 426.8 Rock Island 147546 Rock Island http://www.rockislandcounty.org/
Saline 2/25/1847 383.3 Harrisburg 24913

Sangamon 1/30/1821 868.3 Springfield 197465

Schuyler 1/13/1825 437.8 Rushville 7544

Scott 2/16/1839 251 Winchester 5355

Shelby 1/23/1827 758.6 Shelbyville 22363

Stark 3/2/1839 287.9 Toulon 5994

St. Clair 4/27/1790 663.9 Belleville 270056

Stephenson 3/4/1837 564.3 Freeport 47711 Stephenson http://co.stephenson.il.us/
Tazewell 1/31/1827 648.9 Pekin 135394

Union 1/2/1818 416.2 Jonesboro 17808

Vermilion 1/18/1826 899.1 Danville 81625

Wabash 12/27/1824 223.5 Mount Carmel 11947

Warren 1/13/1825 542.6 Monmouth 17707

Washington 1/2/1818 562.7 Nashville 14716

Wayne 3/26/1819 713.9 Fairfield 16760

White 12/9/1815 494.9 Carmi 14665

Whiteside 1/16/1836 684.8 Morrison 58498 Whiteside http://www.whiteside.org/
Will 1/12/1836 837.3 Joliet 677560 Will http://www.willcountyillinois.com/
Williamson 2/28/1839 424.2 Marion 66357

Winnebago 1/16/1836 513.8 Rockford 295266 Winnebago http://www.wincoil.us/
Woodford 2/27/1841 528 Eureka 38664