Mon . 19 May 2019

List of counties in Illinois

list of counties in illinois in alphabetical order, list of counties in illinois e
There are 102 counties in the state of Illinois

Most counties in Illinois were named after early American leaders, especially of the American Revolutionary War, as well as soldiers from the Battle of Tippecanoe and the War of 1812 Some are named after natural features or counties in other states Some are named for early Illinois leaders Two counties are named for Native American tribes, and one bears the name of a plant used as a food source by Native Americans

While it does have a city, Illinois does not have a Lincoln County named after its favorite son, Abraham Lincoln; it does, however, have a Douglas County founded 1859 named after his political rival Stephen A Douglas It also has Calhoun County founded 1825, named after John C Calhoun, outspoken for his pro-slavery and pro-southern views in the years preceding the American Civil War Several of the counties are named after Southerners, reflecting the fact that Illinois was for a short time part of Virginia, and settled in its early years by many Southerners No counties are named after Northern heroes of the Civil War, mainly because the counties were all named before that war The state does have a Lee County named after the family of Robert E Lee, who at one time served in Illinois Illinois also has two counties named after the same person, New York governor DeWitt Clinton this may be unusual, but it is not unprecedented since Virginia has had two counties named after Patrick Henry since 1790

Information on the FIPS county code, county seat, year of establishment, origin, etymology, population, area and map of each county is included in the table below

Illinois's postal abbreviation is IL and its FIPS state code is 17


  • 1 Counties
  • 2 Defunct counties
  • 3 See also
  • 4 Notes
  • 5 References
  • 6 External links


Note: the links in the FIPS County Code column are to the Census Bureau info page for that county

FIPS County Code
County seat
Adams County 001 Quincy 1825 Pike County John Quincy Adams 1767–1848, sixth President of the United States 7004671030000000000♠67,103 7002857000000000000♠857 sq mi
7003222000000000000♠2,220 km2
Alexander County 003 Cairo 1819 Union County William M Alexander, settler and state representative in the Illinois General Assembly 7003823800000000000♠8,238 7002236000000000000♠236 sq mi
7002611000000000000♠611 km2
Bond County 005 Greenville 1817 Crawford County, Edwards County, and Madison County Shadrach Bond 1773–1832, first Governor of Illinois 7004177680000000000♠17,768 7002380000000000000♠380 sq mi
7002984000000000000♠984 km2
Boone County 007 Belvidere 1837 Winnebago County Daniel Boone 1734–1820, trailblazer of the Wilderness Road in Kentucky 7004541650000000000♠54,165 7002281000000000000♠281 sq mi
7002728000000000000♠728 km2
Brown County 009 Mount Sterling 1839 Schuyler County Jacob Brown 1775–1828, successful War of 1812 army officer responsible for Great Lakes defenses 7003693700000000000♠6,937 7002306000000000000♠306 sq mi
7002793000000000000♠793 km2
Bureau County 011 Princeton 1837 Putnam County Pierre de Bureo, Frenchman, North American fur trader 7004349780000000000♠34,978 7002869000000000000♠869 sq mi
7003225100000000000♠2,251 km2
Calhoun County 013 Hardin 1825 Pike County John C Calhoun 1782–1850, South Carolina senator and seventh Vice President of the United States 7003508900000000000♠5,089 7002254000000000000♠254 sq mi
7002658000000000000♠658 km2
Carroll County 015 Mount Carroll 1839 Jo Daviess Charles Carroll of Carrollton 1737–1832, signed the Declaration of Independence on behalf of Maryland 7004153870000000000♠15,387 7002444000000000000♠444 sq mi
7003115000000000000♠1,150 km2
Cass County 017 Virginia 1837 Morgan County Lewis Cass 1782–1866, second governor of Michigan Territory, fourteenth United States Secretary of War 7004136420000000000♠13,642 7002376000000000000♠376 sq mi
7002974000000000000♠974 km2
Champaign County 019 Urbana 1833 Vermilion County Champaign County, Ohio, which took its name from the French for "open level country" 7005201081000000000♠201,081 7002997000000000000♠997 sq mi
7003258200000000000♠2,582 km2
Christian County 021 Taylorville 1839 Sangamon County Christian County, Kentucky, which was itself named after Colonel William Christian 7004348000000000000♠34,800 7002709000000000000♠709 sq mi
7003183600000000000♠1,836 km2
Clark County 023 Marshall 1819 Crawford County George Rogers Clark 1752–1818, highest-ranking officer in the Northwest Territory during the American Revolution 7004163350000000000♠16,335 7002502000000000000♠502 sq mi
7003130000000000000♠1,300 km2
Clay County 025 Louisville 1824 Wayne, Lawrence, Fayette, and Crawford County Henry Clay 1777–1852, Kentucky legislator who negotiated the Missouri Compromise 7004138150000000000♠13,815 7002469000000000000♠469 sq mi
7003121500000000000♠1,215 km2
Clinton County 027 Carlyle 1824 Washington, Bond, and Fayette County DeWitt Clinton 1769–1828, Governor of New York, responsible for the construction of the Erie Canal 7004377620000000000♠37,762 7002474000000000000♠474 sq mi
7003122800000000000♠1,228 km2
Coles County 029 Charleston 1830 Clark and Edgar County Edward Coles 1786–1868, second Governor of Illinois, responsible for the abolition of slavery in Illinois 7004538730000000000♠53,873 7002508000000000000♠508 sq mi
7003131600000000000♠1,316 km2
Cook County 031 Chicago 1831 Putnam County Daniel Pope Cook 1794–1827, politician and first Attorney General of Illinois 7006519467500000000♠5,194,675 7002946000000000000♠946 sq mi
7003245000000000000♠2,450 km2
Crawford County 033 Robinson 1816 Edwards County William H Crawford 1772–1834, ninth United States Secretary of War, seventh Secretary of the Treasury 7004198170000000000♠19,817 7002444000000000000♠444 sq mi
7003115000000000000♠1,150 km2
Cumberland County 035 Toledo 1843 Coles County Disputed: Cumberland Road, which entered the county; Cumberland, Maryland; or Cumberland River in Kentucky 7004110480000000000♠11,048 7002346000000000000♠346 sq mi
7002896000000000000♠896 km2
DeKalb County 037 Sycamore 1837 Kane County Johann de Kalb 1721–1780, German soldier in the Continental Army who fought alongside Gilbert du Motier, marquis de Lafayette 7005105160000000000♠105,160 7002634000000000000♠634 sq mi
7003164200000000000♠1,642 km2
DeWitt County 039 Clinton 1839 Macon and McLean County DeWitt Clinton 1769–1828, Governor of New York, responsible for the construction of the Erie Canal 7004165610000000000♠16,561 7002398000000000000♠398 sq mi
7003103100000000000♠1,031 km2
Douglas County 041 Tuscola 1859 Coles County Stephen A Douglas 1813–61, prominent Illinois Democrat who engaged in debates with Abraham Lincoln 7004199800000000000♠19,980 7002417000000000000♠417 sq mi
7003108000000000000♠1,080 km2
DuPage County 043 Wheaton 1839 Cook County DuPage River 7005916924000000000♠916,924 7002334000000000000♠334 sq mi
7002865000000000000♠865 km2
Edgar County 045 Paris 1823 Clark County John Edgar c 1750–1832, Illinois delegate to the Northwest Territory legislature; at the time, wealthiest man in Illinois 7004185760000000000♠18,576 7002624000000000000♠624 sq mi
7003161600000000000♠1,616 km2
Edwards County 047 Albion 1814 Gallatin County and Madison County Ninian Edwards 1775–1833, third Governor of the State of Illinois and only governor of the Illinois Territory 7003672100000000000♠6,721 7002222000000000000♠222 sq mi
7002575000000000000♠575 km2
Effingham County 049 Effingham 1831 Fayette and Crawford County Thomas Howard, 3rd Earl of Effingham, military officer who resigned from the British Army to avoid fighting the American colonies 7004342420000000000♠34,242 7002479000000000000♠479 sq mi
7003124100000000000♠1,241 km2
Fayette County 051 Vandalia 1821 Bond, Wayne, Clark, Jefferson, and Crawford County Gilbert du Motier, marquis de Lafayette 1757–1834, French military officer who was a key factor in the American and French Revolutions 7004221400000000000♠22,140 7002716000000000000♠716 sq mi
7003185400000000000♠1,854 km2
Ford County 053 Paxton 1859 Vermilion County Thomas Ford 1800–50, eighth Governor of Illinois; served during the Illinois Mormon War 7004140810000000000♠14,081 7002486000000000000♠486 sq mi
7003125900000000000♠1,259 km2
Franklin County 055 Benton 1818 White County and Gallatin County Benjamin Franklin 1706–90, prolific writer, inventor, and politician; key factor in the American Revolution 7004395610000000000♠39,561 7002412000000000000♠412 sq mi
7003106700000000000♠1,067 km2
Fulton County 057 Lewistown 1823 Pike County Robert Fulton 1765–1815, inventor of the steamboat 7004370690000000000♠37,069 7002866000000000000♠866 sq mi
7003224300000000000♠2,243 km2
Gallatin County 059 Shawneetown 1812 Randolph County Albert Gallatin 1761–1849, fourth and longest-serving United States Secretary of the Treasury 7003558900000000000♠5,589 7002324000000000000♠324 sq mi
7002839000000000000♠839 km2
Greene County 061 Carrollton 1821 Madison County Nathanael Greene 1742–86, major general in the Continental Army 7004138860000000000♠13,886 7002543000000000000♠543 sq mi
7003140600000000000♠1,406 km2
Grundy County 063 Morris 1841 LaSalle County Felix Grundy 1777–1840, Tennessean senator who served as the thirteenth United States Attorney General 7004500630000000000♠50,063 7002420000000000000♠420 sq mi
7003108800000000000♠1,088 km2
Hamilton County 065 McLeansboro 1821 White County Alexander Hamilton 1755–1804, first United States Secretary of the Treasury 7003845700000000000♠8,457 7002435000000000000♠435 sq mi
7003112700000000000♠1,127 km2
Hancock County 067 Carthage 1825 Adams County John Hancock 1737–93, first governor of the Massachusetts colony and president of the Second Continental Congress 7004191040000000000♠19,104 7002795000000000000♠795 sq mi
7003205900000000000♠2,059 km2
Hardin County 069 Elizabethtown 1839 Pope County Hardin County, Kentucky, which was itself named after John Hardin 7003432000000000000♠4,320 7002178000000000000♠178 sq mi
7002461000000000000♠461 km2
Henderson County 071 Oquawka 1841 Warren County Henderson County, Kentucky, which was itself named after Richard Henderson 7003733100000000000♠7,331 7002379000000000000♠379 sq mi
7002982000000000000♠982 km2
Henry County 073 Cambridge 1825 Fulton County Patrick Henry 1736-99, American Revolutionary War figure; first and sixth Governor of Virginia 7004504860000000000♠50,486 7002823000000000000♠823 sq mi
7003213200000000000♠2,132 km2
Iroquois County 075 Watseka 1833 Vermilion County Iroquois Native Americans 7004297180000000000♠29,718 7003111600000000000♠1,116 sq mi
7003289000000000000♠2,890 km2
Jackson County 077 Murphysboro 1816 Randolph County and Johnson County Andrew Jackson 1767–1845, seventh President of the United States, United States Senator from Tennessee, and general in the War of 1812 7004602180000000000♠60,218 7002588000000000000♠588 sq mi
7003152300000000000♠1,523 km2
Jasper County 079 Newton 1831 Clay and Crawford County Sgt William Jasper c 1750-79, American Revolutionary War soldier popularized by Parson Weems 7003969800000000000♠9,698 7002494000000000000♠494 sq mi
7003127900000000000♠1,279 km2
Jefferson County 081 Mount Vernon 1819 Edwards and White County Thomas Jefferson 1743–1826, third President of the United States, second Vice President of the United States, Governor of Virginia, and one of the foremost Founding Fathers of the United States 7004388270000000000♠38,827 7002571000000000000♠571 sq mi
7003147900000000000♠1,479 km2
Jersey County 083 Jerseyville 1839 Greene County State of New Jersey, from which many early settlers hailed 7004229850000000000♠22,985 7002369000000000000♠369 sq mi
7002956000000000000♠956 km2
Jo Daviess County 085 Galena 1827 Henry, Mercer, and Putnam County Joseph Hamilton Daveiss 1774–1811, commander of the Indiana Dragoons at the Battle of Tippecanoe 7004226780000000000♠22,678 7002601000000000000♠601 sq mi
7003155700000000000♠1,557 km2
Johnson County 087 Vienna 1812 Randolph County Richard Mentor Johnson abt 1780-1850, ninth Vice President of the United States and United States Senator from Kentucky 7004125820000000000♠12,582 7002346000000000000♠346 sq mi
7002896000000000000♠896 km2
Kane County 089 Geneva 1836 LaSalle County Elias Kane 1794–1835, United States Senator from Illinois 7005515269000000000♠515,269 7002521000000000000♠521 sq mi
7003134900000000000♠1,349 km2
Kankakee County 091 Kankakee 1853 Iroquois and Will County Kankakee River 7005113449000000000♠113,449 7002678000000000000♠678 sq mi
7003175600000000000♠1,756 km2
Kendall County 093 Yorkville 1841 LaSalle and Kane County Amos Kendall 1789–1869, United States Postmaster General under Presidents Andrew Jackson and Martin Van Buren 7005114736000000000♠114,736 7002321000000000000♠321 sq mi
7002831000000000000♠831 km2
Knox County 095 Galesburg 1825 Fulton County Gen Henry Knox 1750–1806, American Revolutionary War general and first United States Secretary of War 7004529190000000000♠52,919 7002716000000000000♠716 sq mi
7003185400000000000♠1,854 km2
Lake County 097 Waukegan 1839 McHenry County Lake Michigan 7005703462000000000♠703,462 7002448000000000000♠448 sq mi
7003116000000000000♠1,160 km2
LaSalle County 099 Ottawa 1831 Putnam and Tazewell County Sieur de la Salle 1643-87, French explorer of the Great Lakes 7005113924000000000♠113,924 7003113500000000000♠1,135 sq mi
7003294000000000000♠2,940 km2
Lawrence County 101 Lawrenceville 1821 Crawford and Edwards County Capt James Lawrence 1781–1813, commander of the USS Chesapeake in the War of 1812 Famous for his command "Don't give up the ship!" 7004168330000000000♠16,833 7002372000000000000♠372 sq mi
7002963000000000000♠963 km2
Lee County 103 Dixon 1839 Ogle County "Light Horse" Henry Lee III 1756–1818, American Revolutionary War officer and ninth Governor of Virginia 7004360310000000000♠36,031 7002725000000000000♠725 sq mi
7003187800000000000♠1,878 km2
Livingston County 105 Pontiac 1837 LaSalle and McLean County Edward Livingston 1764–1836, prominent jurist, Congressman from New York and Louisiana, and US Secretary of State from 1831-33 7004389500000000000♠38,950 7003104400000000000♠1,044 sq mi
7003270400000000000♠2,704 km2
Logan County 107 Lincoln 1839 Sangamon County John Logan, country doctor and early settler, and the father of John A Logan 7004303050000000000♠30,305 7002618000000000000♠618 sq mi
7003160100000000000♠1,601 km2
Macon County 115 Decatur 1829 Shelby County Nathaniel Macon 1758–1837, sixth Speaker of the United States House of Representatives and United States Senator from North Carolina 7005110768000000000♠110,768 7002581000000000000♠581 sq mi
7003150500000000000♠1,505 km2
Macoupin County 117 Carlinville 1829 Greene County Native American word macoupin, meaning "American lotus" 7004477650000000000♠47,765 7002864000000000000♠864 sq mi
7003223800000000000♠2,238 km2
Madison County 119 Edwardsville 1812 St Clair County and Randolph County James Madison 1751–1836, fourth President of the United States and principal author of the Constitution of the United States 7005269282000000000♠269,282 7002725000000000000♠725 sq mi
7003187800000000000♠1,878 km2
Marion County 121 Salem 1823 Fayette and Jefferson County Francis Marion c 1732-95, general in the American Revolutionary War known as "The Swamp Fox" 7004394370000000000♠39,437 7002572000000000000♠572 sq mi
7003148100000000000♠1,481 km2
Marshall County 123 Lacon 1839 Putnam County John Marshall 1755–1835, fourth and longest-serving Chief Justice of the United States, wrote opinion in Marbury v Madison establishing the principle of judicial review 7004126400000000000♠12,640 7002386000000000000♠386 sq mi
7003100000000000000♠1,000 km2
Mason County 125 Havana 1841 Tazewell and Menard County Named after Mason County, Kentucky, itself named after George Mason 7004146660000000000♠14,666 7002539000000000000♠539 sq mi
7003139600000000000♠1,396 km2
Massac County 127 Metropolis 1843 Pope and Johnson County Fort Massac, a colonial-era fort on the Ohio River 7004154290000000000♠15,429 7002239000000000000♠239 sq mi
7002619000000000000♠619 km2
McDonough County 109 Macomb 1826 Schuyler County Commodore Thomas Macdonough 1783–1825, commander of American naval forces at the Battle of Plattsburgh 7004326120000000000♠32,612 7002589000000000000♠589 sq mi
7003152600000000000♠1,526 km2
McHenry County 111 Woodstock 1836 Cook and LaSalle County Major William McHenry c 1771 – 1835, officer in during several campaigns against Native Americans and member of the Illinois legislature 7005308760000000000♠308,760 7002604000000000000♠604 sq mi
7003156400000000000♠1,564 km2
McLean County 113 Bloomington 1830 Tazewell County John McLean 1791–1830, United States Representative and United States Senator from Illinois the latter from 1824-25 and 1829-30 7005169572000000000♠169,572 7003118400000000000♠1,184 sq mi
7003306700000000000♠3,067 km2
Menard County 129 Petersburg 1839 Sangamon County Pierre Menard 1766–1844, prominent early settler and first Lieutenant Governor of Illinois 7004127050000000000♠12,705 7002314000000000000♠314 sq mi
7002813000000000000♠813 km2
Mercer County 131 Aledo 1825 Schuyler County Hugh Mercer 1726-77, British officer in the Seven Years' War and general in the Continental Army during the American Revolutionary War 7004164340000000000♠16,434 7002561000000000000♠561 sq mi
7003145300000000000♠1,453 km2
Monroe County 133 Waterloo 1816 Randolph County and St Clair County James Monroe 1758–1831, seventh United States Secretary of State, eighth United States Secretary of War, Governor of Virginia, and fifth President of the United States 7004329570000000000♠32,957 7002388000000000000♠388 sq mi
7003100500000000000♠1,005 km2
Montgomery County 135 Hillsboro 1821 Bond and Madison County Gen Richard Montgomery 1738-75, brigadier-general in the Continental Army who led the unsuccessful invasion of Canada 7004301040000000000♠30,104 7002704000000000000♠704 sq mi
7003182300000000000♠1,823 km2
Morgan County 137 Jacksonville 1823 Sangamon County Gen Daniel Morgan 1736–1802, successful tactician in the American Revolutionary War and later United States Representative from Virginia 7004355470000000000♠35,547 7002569000000000000♠569 sq mi
7003147400000000000♠1,474 km2
Moultrie County 139 Sullivan 1843 Shelby and Macon County Gen William Moultrie 1730–1805, American Revolutionary War general and Governor of South Carolina 7004148460000000000♠14,846 7002336000000000000♠336 sq mi
7002870000000000000♠870 km2
Ogle County 141 Oregon 1836 Jo Daviess Joseph Ogle 1737–1821, early settler in southwest Illinois, who helped found the first Methodist church in Illinois 7004534970000000000♠53,497 7002759000000000000♠759 sq mi
7003196600000000000♠1,966 km2
Peoria County 143 Peoria 1825 Fulton County The Peoria Native American tribe 7005186494000000000♠186,494 7002620000000000000♠620 sq mi
7003160600000000000♠1,606 km2
Perry County 145 Pinckneyville 1827 Randolph and Jackson County Commodore Oliver Hazard Perry 1785–1819, American naval officer who led the victorious American forces at the Battle of Lake Erie 7004223500000000000♠22,350 7002441000000000000♠441 sq mi
7003114200000000000♠1,142 km2
Piatt County 147 Monticello 1841 DeWitt and Macon County John Piatt, the patriarch of a prominent settler family in the early history of the county 7004167290000000000♠16,729 7002440000000000000♠440 sq mi
7003114000000000000♠1,140 km2
Pike County 149 Pittsfield 1821 Madison, Bond, and Clark County Zebulon Pike 1779–1813, early explorer of the American Southwest, namesake of Pikes Peak 7004164300000000000♠16,430 7002830000000000000♠830 sq mi
7003215000000000000♠2,150 km2
Pope County 151 Golconda 1816 Gallatin and Johnson County Nathaniel Pope 1784–1850, early Delegate from Illinois Territory to Congress and judge on the United States District Court for the District of Illinois 7003447000000000000♠4,470 7002371000000000000♠371 sq mi
7002961000000000000♠961 km2
Pulaski County 153 Mound City 1843 Alexander and Johnson County Gen Casimir Pulaski 1745-79, Polish American general of cavalry in the American Revolutionary War 7003616100000000000♠6,161 7002201000000000000♠201 sq mi
7002521000000000000♠521 km2
Putnam County 155 Hennepin 1825 Fulton County Gen Israel Putnam 1718-90, commander of American forces at the Battle of Bunker Hill 7003600600000000000♠6,006 7002160000000000000♠160 sq mi
7002414000000000000♠414 km2
Randolph County 157 Chester 1795 St Clair County Edmund Randolph 1753–1813, first Attorney General of the United States, and briefly United States Secretary of State 7004334760000000000♠33,476 7002578000000000000♠578 sq mi
7003149700000000000♠1,497 km2
Richland County 159 Olney 1841 Clay and Lawrence County Richland County, Ohio, itself named for its rich soil 7004162330000000000♠16,233 7002360000000000000♠360 sq mi
7002932000000000000♠932 km2
Rock Island County 161 Rock Island 1831 Jo Daviess County Rock Island 7005147546000000000♠147,546 7002427000000000000♠427 sq mi
7003110600000000000♠1,106 km2
Saline County 165 Harrisburg 1847 Gallatin County Salt springs within the county 7004249130000000000♠24,913 7002383000000000000♠383 sq mi
7002992000000000000♠992 km2
Sangamon County 167 Springfield 1821 Madison and Bond County Sangamon River 7005197465000000000♠197,465 7002868000000000000♠868 sq mi
7003224800000000000♠2,248 km2
Schuyler County 169 Rushville 1825 Pike and Fulton County Gen Philip Schuyler 1733–1804, American Revolutionary War general and United States Senator from New York 7003754400000000000♠7,544 7002437000000000000♠437 sq mi
7003113200000000000♠1,132 km2
Scott County 171 Winchester 1839 Morgan County Scott County, Kentucky, itself named after Charles Scott 7003535500000000000♠5,355 7002251000000000000♠251 sq mi
7002650000000000000♠650 km2
Shelby County 173 Shelbyville 1827 Fayette County Isaac Shelby 1750–1826, soldier in the American Revolutionary War and War of 1812; first and fifth Governor of Kentucky 7004223630000000000♠22,363 7002759000000000000♠759 sq mi
7003196600000000000♠1,966 km2
St Clair County 163 Belleville 1790 original two counties Arthur St Clair 1737–1818, major general in the American Revolutionary War and first Governor of the Northwest Territory 7005270056000000000♠270,056 7002664000000000000♠664 sq mi
7003172000000000000♠1,720 km2
Stark County 175 Toulon 1839 Knox and Putnam County Gen John Stark 1728–1822, general in the American Revolutionary War, called the "Hero of Bennington" 7003599400000000000♠5,994 7002288000000000000♠288 sq mi
7002746000000000000♠746 km2
Stephenson County 177 Freeport 1837 Jo Daviess and Winnebago County Benjamin Stephenson 1769–1822, representative of Illinois Territory in the United States Congress from 1814 to 1816 7004477110000000000♠47,711 7002564000000000000♠564 sq mi
7003146100000000000♠1,461 km2
Tazewell County 179 Pekin 1827 Sangamon County Littleton Waller Tazewell 1774–1860, United States Senator from and later governor of Virginia 7005135394000000000♠135,394 7002649000000000000♠649 sq mi
7003168100000000000♠1,681 km2
Union County 181 Jonesboro 1818 Johnson County The federal union of the states 7004178080000000000♠17,808 7002416000000000000♠416 sq mi
7003107700000000000♠1,077 km2
Vermilion County 183 Danville 1826 Edgar County The Vermilion River 7004816250000000000♠81,625 7002899000000000000♠899 sq mi
7003232800000000000♠2,328 km2
Wabash County 185 Mount Carmel 1824 Edwards County The Wabash River 7004119470000000000♠11,947 7002224000000000000♠224 sq mi
7002580000000000000♠580 km2
Warren County 187 Monmouth 1825 Schuyler County Joseph Warren 1741-75, played a role in American Patriot movements, a prominent early fatality in the American Revolutionary War 7004177070000000000♠17,707 7002543000000000000♠543 sq mi
7003140600000000000♠1,406 km2
Washington County 189 Nashville 1818 St Clair County George Washington 1732-99, commander-in-chief of American forces in the American Revolutionary War and first President of the United States 7004147160000000000♠14,716 7002563000000000000♠563 sq mi
7003145800000000000♠1,458 km2
Wayne County 191 Fairfield 1819 Edwards County Gen "Mad" Anthony Wayne 1745-96, major general in the United States Army in the American Revolutionary War and the Northwest Indian War 7004167600000000000♠16,760 7002714000000000000♠714 sq mi
7003184900000000000♠1,849 km2
White County 193 Carmi 1815 Gallatin County Isaac White 1776–1811, resident of Illinois who enlisted in the Indiana militia and was killed at the Battle of Tippecanoe 7004146650000000000♠14,665 7002495000000000000♠495 sq mi
7003128200000000000♠1,282 km2
Whiteside County 195 Morrison 1836 Jo Daviess and Henry County Samuel Whiteside 1783–1868, state legislator and militia leader 7004584980000000000♠58,498 7002685000000000000♠685 sq mi
7003177400000000000♠1,774 km2
Will County 197 Joliet 1836 Cook and Iroquois County Conrad Will 1779–1835,5 physician, local businessman and longtime member of the state legislature 7005677560000000000♠677,560 7002837000000000000♠837 sq mi
7003216800000000000♠2,168 km2
Williamson County 199 Marion 1839 Franklin County Hugh Williamson 1735–1819, delegate from North Carolina to the Philadelphia Convention 7004663570000000000♠66,357 7002424000000000000♠424 sq mi
7003109800000000000♠1,098 km2
Winnebago County 201 Rockford 1836 Jo Daviess Winnebago Native Americans 7005295266000000000♠295,266 7002514000000000000♠514 sq mi
7003133100000000000♠1,331 km2
Woodford County 203 Eureka 1841 Tazewell and McLean County Gen William Woodford 1734-80, brigadier general in the American Revolutionary War who died while a British prisoner 7004386640000000000♠38,664 7002528000000000000♠528 sq mi
7003136800000000000♠1,368 km2

Defunct countiesedit

  • Dane County was renamed in 1840 to the current Christian County
  • The original Knox County, Illinois, became extinct with the formation of the Illinois Territory in 1809 - or, more precisely, it became Knox County, Indiana The modern Knox County, Illinois was formed much later and was not a part of the original Knox County

See alsoedit

  • Illinois portal
  • List of census-designated places in Illinois
  • List of cities in Illinois
  • List of Illinois townships
  • List of precincts in Illinois
  • List of towns and villages in Illinois
  • List of unincorporated communities in Illinois
  • National Association of Counties
  • National Register of Historic Places listings in Illinois


  1. ^ "EPA County FIPS Code Listing" EPAgov Retrieved 2008-02-23 
  2. ^ a b c d "Find a county" National Association of Counties Retrieved 2012-09-26 
  3. ^ "Illinois County Biographies" Genealogy Trailscom Genealogy Trails 2000 Retrieved 2008-09-21 
  4. ^ "The Origin of Illinois County Names" Genealogy Trailscom Genealogy Trails 2000 Retrieved 2008-09-21 
  5. ^ Matile, Roger 22 June 2006 "Reflections: Was Dr Conrad Will really worth his salt" Ledger-Sentinel Retrieved 11 October 2011 


  • Hébert, Michael L 2012 "Illinois County Boundaries: 1790 - Present" ILGenWeb 
  • White, Jesse March 2010 "Origin and Evolution of Illinois Counties" PDF Illinois Secretary of State 

External linksedit

  • Census 2000 US Gazetteer Files
  • Illinois Association of County Board Members
  • Illinois Association of County Officials
  • Illinois City/County Management Association

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List of counties in Illinois

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