List of counties in Illinois

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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 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 a singular distinction of having two counties named after the same person, New York governor, DeWitt Clinton.

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.

Counties[edit]

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

County
FIPS code
[1]
County seat
[2]
Established
[2]
Origin
Etymology[3][4]
Population
[2]
Area
[2]
Map
Adams County001Quincy1825Pike CountyJohn Quincy Adams (1767–1848), sixth President of the United States67,103857 sq mi
(2,220 km2)
State map highlighting Adams County
Alexander County003Cairo1819Union CountyWilliam M. Alexander, a settler and state representative in the Illinois General Assembly8,238236 sq mi
(611 km2)
State map highlighting Alexander County
Bond County005Greenville1817Crawford County, Edwards County, and Madison CountyShadrach Bond (1773–1832), First Governor of Illinois17,768380 sq mi
(984 km2)
State map highlighting Bond County
Boone County007Belvidere1837Winnebago CountyDaniel Boone (1734-1820), trailblazer of the Wilderness Road in Kentucky54,165281 sq mi
(728 km2)
State map highlighting Boone County
Brown County009Mount Sterling1839Schuyler CountyJacob Brown (1775–1828), a successful American Revolution army officer responsible for Great Lakes defenses6,937306 sq mi
(793 km2)
State map highlighting Brown County
Bureau County011Princeton1837Putnam CountyPierre de Bureo, Frenchman, North American fur trader34,978869 sq mi
(2,251 km2)
State map highlighting Bureau County
Calhoun County013Hardin1825Pike CountyJohn C. Calhoun (1782–1850), South Carolina senator and seventh Vice President of the United States5,089254 sq mi
(658 km2)
State map highlighting Calhoun County
Carroll County015Mount Carroll1839Jo DaviessCharles Carroll of Carrollton (1737–1832), signed the Declaration of Independence on behalf of Maryland15,387444 sq mi
(1,150 km2)
State map highlighting Carroll County
Cass County017Virginia1837Morgan CountyLewis Cass (1782–1866), second governor of Michigan Territory, fourteenth United States Secretary of War13,642376 sq mi
(974 km2)
State map highlighting Cass County
Champaign County019Urbana1833Vermilion CountyChampaign County, Ohio, which took its name from the French for "open level country"201,081997 sq mi
(2,582 km2)
State map highlighting Champaign County
Christian County021Taylorville1839Sangamon CountyChristian County, Kentucky, which was itself named after Colonel William Christian34,800709 sq mi
(1,836 km2)
State map highlighting Christian County
Clark County023Marshall1819Crawford CountyGeorge Rogers Clark (1752–1818), highest-ranking officer in the Northwest Territory during the American Revolution16,335502 sq mi
(1,300 km2)
State map highlighting Clark County
Clay County025Louisville1824Wayne, Lawrence, Fayette, and Crawford CountyHenry Clay (1777–1852), Kentucky legislator who negotiated the Missouri Compromise13,815469 sq mi
(1,215 km2)
State map highlighting Clay County
Clinton County027Carlyle1824Washington, Bond, and Fayette CountyDeWitt Clinton (1769–1828), Governor of New York, responsible for the construction of the Erie Canal37,762474 sq mi
(1,228 km2)
State map highlighting Clinton County
Coles County029Charleston1830Clark and Edgar CountyEdward Coles (1786–1868), second Governor of Illinois, responsible for the abolition of slavery in Illinois53,873508 sq mi
(1,316 km2)
State map highlighting Coles County
Cook County031Chicago1831Putnam CountyDaniel Pope Cook (1794–1827), politician and first Attorney General of Illinois5,194,675946 sq mi
(2,450 km2)
State map highlighting Cook County
Crawford County033Robinson1816Edwards CountyWilliam H. Crawford (1772–1834), ninth United States Secretary of War, seventh Secretary of the Treasury19,817444 sq mi
(1,150 km2)
State map highlighting Crawford County
Cumberland County035Toledo1843Coles CountyDisputed: Cumberland Road, which entered the county; Cumberland, Maryland; or Cumberland River in Kentucky11,048346 sq mi
(896 km2)
State map highlighting Cumberland County
DeKalb County037Sycamore1837Kane CountyJohann de Kalb (1721–80), German soldier in the Continental Army who fought alongside Gilbert du Motier, marquis de Lafayette105,160634 sq mi
(1,642 km2)
State map highlighting DeKalb County
DeWitt County039Clinton1839Macon and McLean CountyDeWitt Clinton (1769–1828), Governor of New York, responsible for the construction of the Erie Canal16,561398 sq mi
(1,031 km2)
State map highlighting DeWitt County
Douglas County041Tuscola1859Coles CountyStephen A. Douglas (1813–61), prominent Illinois Democrat who engaged in debates with Abraham Lincoln19,980417 sq mi
(1,080 km2)
State map highlighting Douglas County
DuPage County043Wheaton1839Cook CountyDuPage River916,924334 sq mi
(865 km2)
State map highlighting DuPage County
Edgar County045Paris1823Clark CountyJohn Edgar (c. 1750–1832), Illinois delegate to the Northwest Territory legislature; at time, wealthiest man in Illinois18,576624 sq mi
(1,616 km2)
State map highlighting Edgar County
Edwards County047Albion1814Gallatin County and Madison CountyNinian Edwards (1775–1833), third Governor of the State of Illinois and only governor of the Illinois Territory6,721222 sq mi
(575 km2)
State map highlighting Edwards County
Effingham County049Effingham1831Fayette and Crawford CountyLord Thomas Effingham, military officer who resigned from the British Army to avoid fighting the American colonies34,242479 sq mi
(1,241 km2)
State map highlighting Effingham County
Fayette County051Vandalia1821Bond, Wayne, Clark, Jefferson, and Crawford CountyMarquis de la Fayette (1757–1834), French military officer who was a key factor in the American and French Revolutions.22,140716 sq mi
(1,854 km2)
State map highlighting Fayette County
Ford County053Paxton1859Vermilion CountyThomas Ford (1800–50), eighth Governor of Illinois; served during the Illinois Mormon War14,081486 sq mi
(1,259 km2)
State map highlighting Ford County
Franklin County055Benton1818White County and Gallatin CountyBenjamin Franklin (1706–90), prolific writer, inventor, and politician; key factor in the American Revolution39,561412 sq mi
(1,067 km2)
State map highlighting Franklin County
Fulton County057Lewistown1823Pike CountyRobert Fulton (1765–1815), inventor of the steamboat37,069866 sq mi
(2,243 km2)
State map highlighting Fulton County
Gallatin County059Shawneetown1812Randolph CountyAlbert Gallatin (1761–1849), fourth and longest-serving United States Secretary of the Treasury5,589324 sq mi
(839 km2)
State map highlighting Gallatin County
Greene County061Carrollton1821Madison CountyNathanael Greene (1742–86), major general in the Continental Army13,886543 sq mi
(1,406 km2)
State map highlighting Greene County
Grundy County063Morris1841LaSalle CountyFelix Grundy (1777–1840), Tennessean senator that served as the thirteenth United States Attorney General50,063420 sq mi
(1,088 km2)
State map highlighting Grundy County
Hamilton County065McLeansboro1821White CountyAlexander Hamilton (1755–1804), first United States Secretary of the Treasury8,457435 sq mi
(1,127 km2)
State map highlighting Hamilton County
Hancock County067Carthage1825Adams CountyJohn Hancock (1737–93), first governor of the Massachusetts colony and president of the Second Continental Congress19,104795 sq mi
(2,059 km2)
State map highlighting Hancock County
Hardin County069Elizabethtown1839Pope CountyHardin County, Kentucky, which was itself named after John Hardin4,320178 sq mi
(461 km2)
State map highlighting Hardin County
Henderson County071Oquawka1841Warren CountyHenderson County, Kentucky, which was itself named after Richard Henderson7,331379 sq mi
(982 km2)
State map highlighting Henderson County
Henry County073Cambridge1825Fulton CountyPatrick Henry (1736-99), American Revolutionary War figure and first and sixth Governor of Virginia50,486823 sq mi
(2,132 km2)
State map highlighting Henry County
Iroquois County075Watseka1833Vermilion CountyIroquois Native Americans29,7181,116 sq mi
(2,890 km2)
State map highlighting Iroquois County
Jackson County077Murphysboro1816Randolph County and Johnson CountyAndrew Jackson (1767-1845), seventh President of the United States, United States Senator from Tennessee, and general in the War of 181260,218588 sq mi
(1,523 km2)
State map highlighting Jackson County
Jasper County079Newton1831Clay and Crawford CountySgt. William Jasper (c. 1750-79), American Revolutionary War soldier popularized by Parson Weems9,698494 sq mi
(1,279 km2)
State map highlighting Jasper County
Jefferson County081Mount Vernon1819Edwards and White CountyThomas 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 States38,827571 sq mi
(1,479 km2)
State map highlighting Jefferson County
Jersey County083Jerseyville1839Greene CountyState of New Jersey, from which many early settlers hailed22,985369 sq mi
(956 km2)
State map highlighting Jersey County
Jo Daviess County085Galena1827Henry, Mercer, and Putnam CountyJoseph Hamilton Daveiss (1774-1811), commander of the Indiana Dragoons at the Battle of Tippecanoe22,678601 sq mi
(1,557 km2)
State map highlighting Jo Daviess County
Johnson County087Vienna1812Randolph CountyRichard Mentor Johnson (abt. 1780-1850), ninth Vice President of the United States and United States Senator form Kentucky12,582346 sq mi
(896 km2)
State map highlighting Johnson County
Kane County089Geneva1836LaSalle CountyElias Kane (1794-1835), United States Senator from Illinois515,269521 sq mi
(1,349 km2)
State map highlighting Kane County
Kankakee County091Kankakee1853Iroquois and Will CountyKankakee River113,449678 sq mi
(1,756 km2)
State map highlighting Kankakee County
Kendall County093Yorkville1841LaSalle and Kane CountyAmos Kendall (1789-1869), United States Postmaster General under Presidents Andrew Jackson and Martin Van Buren114,736321 sq mi
(831 km2)
State map highlighting Kendall County
Knox County095Galesburg1825Fulton CountyGen. Henry Knox (1750-1806), American Revolutionary War general and first United States Secretary of War52,919716 sq mi
(1,854 km2)
State map highlighting Knox County
Lake County097Waukegan1839McHenry CountyLake Michigan703,462448 sq mi
(1,160 km2)
State map highlighting Lake County
LaSalle County099Ottawa1831Putnam and Tazewell CountySieur de la Salle (1643-87), French explorer of the Great Lakes.113,9241,135 sq mi
(2,940 km2)
State map highlighting LaSalle County
Lawrence County101Lawrenceville1821Crawford and Edwards CountyCapt. James Lawrence (1781-1813), commander of the USS Chesapeake in the War of 1812. Famous for his command "Don't give up the ship!"16,833372 sq mi
(963 km2)
State map highlighting Lawrence County
Lee County103Dixon1839Ogle County"Light Horse" Henry Lee III (1756-1818), American Revolutionary War officer and ninth Governor of Virginia36,031725 sq mi
(1,878 km2)
State map highlighting Lee County
Livingston County105Pontiac1837LaSalle and McLean CountyEdward Livingston (1764-1836), prominent jurist, Congressman from New York and Louisiana, and U.S. Secretary of State from 1831-33.38,9501,044 sq mi
(2,704 km2)
State map highlighting Livingston County
Logan County107Lincoln1839Sangamon CountyJohn Logan, a country doctor and early settler, and the father of John A. Logan.30,305618 sq mi
(1,601 km2)
State map highlighting Logan County
Macon County115Decatur1829Shelby CountyNathaniel Macon (1758-1837), sixth Speaker of the United States House of Representatives and United States Senator from North Carolina.110,768581 sq mi
(1,505 km2)
State map highlighting Macon County
Macoupin County117Carlinville1829Greene CountyNative American word Macoupin, meaning American lotus47,765864 sq mi
(2,238 km2)
State map highlighting Macoupin County
Madison County119Edwardsville1812St. Clair County and Randolph CountyJames Madison (1751-1836), fourth President of the United States and principal author of the Constitution of the United States.269,282725 sq mi
(1,878 km2)
State map highlighting Madison County
Marion County121Salem1823Fayette and Jefferson CountyFrancis Marion (c. 1732-95), general in the American Revolutionary War known as "The Swamp Fox"39,437572 sq mi
(1,481 km2)
State map highlighting Marion County
Marshall County123Lacon1839Putnam CountyJohn Marshall (1755-1835), fourth and longest-serving Chief Justice of the United States, wrote opinion in Marbury v. Madison establishing the principle of judicial review12,640386 sq mi
(1,000 km2)
State map highlighting Marshall County
Mason County125Havana1841Tazewell and Menard CountyNamed after Mason County, Kentucky, itself named after George Mason14,666539 sq mi
(1,396 km2)
State map highlighting Mason County
Massac County127Metropolis1843Pope and Johnson CountyFort Massac, a colonial-era fort on the Ohio River15,429239 sq mi
(619 km2)
State map highlighting Massac County
McDonough County109Macomb1826Schuyler CountyCommodore Thomas Macdonough (1783-1825), commander of American naval forces at the Battle of Plattsburgh32,612589 sq mi
(1,526 km2)
State map highlighting McDonough County
McHenry County111Woodstock1836Cook and LaSalle CountyMajor William McHenry (c. 1771-1835), officer in during several campaigns against Native Americans and member of the Illinois legislature308,760604 sq mi
(1,564 km2)
State map highlighting McHenry County
McLean County113Bloomington1830Tazewell CountyJohn McLean (1791-1830), United States Representative and United States Senator from Illinois (the latter from 1824-25 and 1829-30)169,5721,184 sq mi
(3,067 km2)
State map highlighting McLean County
Menard County129Petersburg1839Sangamon CountyPierre Menard (1766-1844), prominent early settler and first Lieutenant Governor of Illinois12,705314 sq mi
(813 km2)
State map highlighting Menard County
Mercer County131Aledo1825Schuyler CountyHugh Mercer (1726-77), British officer in the Seven Years' War and general in the Continental Army during the American Revolutionary War16,434561 sq mi
(1,453 km2)
State map highlighting Mercer County
Monroe County133Waterloo1816Randolph County and St. Clair CountyJames Monroe (1758-1831), seventh United States Secretary of State, eighth United States Secretary of War, Governor of Virginia, and fifth President of the United States32,957388 sq mi
(1,005 km2)
State map highlighting Monroe County
Montgomery County135Hillsboro1821Bond and Madison CountyGen. Richard Montgomery (1738-75), brigadier-general in the Continental Army who led the unsuccessful invasion of Canada30,104704 sq mi
(1,823 km2)
State map highlighting Montgomery County
Morgan County137Jacksonville1823Sangamon CountyGen. Daniel Morgan (1736-1802), successful tactician in the American Revolutionary War and later United States Representative from Virginia35,547569 sq mi
(1,474 km2)
State map highlighting Morgan County
Moultrie County139Sullivan1843Shelby and Macon CountyGen. William Moultrie (1730-1805), American Revolutionary War general and Governor of South Carolina14,846336 sq mi
(870 km2)
State map highlighting Moultrie County
Ogle County141Oregon1836Jo DaviessJoseph Ogle (1737-1821), early settler in southwest Illinois, who helped found the first Methodist church in Illinois53,497759 sq mi
(1,966 km2)
State map highlighting Ogle County
Peoria County143Peoria1825Fulton CountyThe Peoria Native American tribe186,494620 sq mi
(1,606 km2)
State map highlighting Peoria County
Perry County145Pinckneyville1827Randolph and Jackson CountyCommodore Oliver Hazard Perry (1785-1819), American naval officer who led the victorious American forces at the Battle of Lake Erie22,350441 sq mi
(1,142 km2)
State map highlighting Perry County
Piatt County147Monticello1841DeWitt and Macon CountyJohn Piatt, the patriarch of a prominent settler family in the early history of the county16,729440 sq mi
(1,140 km2)
State map highlighting Piatt County
Pike County149Pittsfield1821Madison, Bond, and Clark CountyZebulon Pike (1779-1813), early explorer of the American Southwest, namesake of Pikes Peak16,430830 sq mi
(2,150 km2)
State map highlighting Pike County
Pope County151Golconda1816Gallatin and Johnson CountyNathaniel Pope (1784-1850), early Delegate from Illinois Territory to Congress and judge on the United States District Court for the District of Illinois4,470371 sq mi
(961 km2)
State map highlighting Pope County
Pulaski County153Mound City1843Alexander and Johnson CountyGen. Casimir Pulaski (1745-79), Polish American general of cavalry in the American Revolutionary War6,161201 sq mi
(521 km2)
State map highlighting Pulaski County
Putnam County155Hennepin1825Fulton CountyGen. Israel Putnam (1718-90), commander of American forces at the Battle of Bunker Hill6,006160 sq mi
(414 km2)
State map highlighting Putnam County
Randolph County157Chester1795St. Clair CountyEdmund Randolph (1753-1813), first Attorney General of the United States, and briefly United States Secretary of State33,476578 sq mi
(1,497 km2)
State map highlighting Randolph County
Richland County159Olney1841Clay and Lawrence CountyRichland County, Ohio, itself named for its rich soil16,233360 sq mi
(932 km2)
State map highlighting Richland County
Rock Island County161Rock Island1831Jo Daviess CountyRock Island147,546427 sq mi
(1,106 km2)
State map highlighting Rock Island County
Saline County165Harrisburg1847Gallatin CountySalt springs within the county24,913383 sq mi
(992 km2)
State map highlighting Saline County
Sangamon County167Springfield1821Madison and Bond CountySangamon River197,465868 sq mi
(2,248 km2)
State map highlighting Sangamon County
Schuyler County169Rushville1825Pike and Fulton CountyGen. Philip Schuyler (1733-1804), American Revolutionary War general and United States Senator from New York7,544437 sq mi
(1,132 km2)
State map highlighting Schuyler County
Scott County171Winchester1839Morgan CountyScott County, Kentucky, itself named after Charles Scott5,355251 sq mi
(650 km2)
State map highlighting Scott County
Shelby County173Shelbyville1827Fayette CountyIsaac Shelby (1750-1826), soldier in the American Revolutionary War and War of 1812, and first and fifth Governor of Kentucky22,363759 sq mi
(1,966 km2)
State map highlighting Shelby County
St. Clair County163Belleville1790original two countiesArthur St. Clair (1737-1818), major general in the American Revolutionary War and first Governor of the Northwest Territory270,056664 sq mi
(1,720 km2)
State map highlighting St. Clair County
Stark County175Toulon1839Knox and Putnam CountyGen. John Stark (1728-1822), general in the American Revolutionary War, called the "Hero of Bennington"5,994288 sq mi
(746 km2)
State map highlighting Stark County
Stephenson County177Freeport1837Jo Daviess and Winnebago CountyBenjamin Stephenson (1769-1822), representative of Illinois Territory in the United States Congress from 1814 to 181647,711564 sq mi
(1,461 km2)
State map highlighting Stephenson County
Tazewell County179Pekin1827Sangamon CountyLittleton Waller Tazewell (1774-1860), United States Senator from (and later governor of) Virginia135,394649 sq mi
(1,681 km2)
State map highlighting Tazewell County
Union County181Jonesboro1818Johnson CountyThe federal union of the states17,808416 sq mi
(1,077 km2)
State map highlighting Union County
Vermilion County183Danville1826Edgar CountyThe Vermilion River81,625899 sq mi
(2,328 km2)
State map highlighting Vermilion County
Wabash County185Mount Carmel1824Edwards CountyThe Wabash River11,947224 sq mi
(580 km2)
State map highlighting Wabash County
Warren County187Monmouth1825Schuyler CountyJoseph Warren (1741-75), played a role in American Patriot movements, a prominent early fatality in the American Revolutionary War17,707543 sq mi
(1,406 km2)
State map highlighting Warren County
Washington County189Nashville1818St. Clair CountyGeorge Washington (1732-99), commander-in-chief of American forces in the American Revolutionary War and first President of the United States14,716563 sq mi
(1,458 km2)
State map highlighting Washington County
Wayne County191Fairfield1819Edwards CountyGen. "Mad" Anthony Wayne (1745-96), major general in the United States Army in the American Revolutionary War and the Northwest Indian War16,760714 sq mi
(1,849 km2)
State map highlighting Wayne County
White County193Carmi1815Gallatin CountyIsaac White (1776-1811), resident of Illinois who enlisted in the Indiana militia and was killed at the Battle of Tippecanoe14,665495 sq mi
(1,282 km2)
State map highlighting White County
Whiteside County195Morrison1836Jo Daviess and Henry CountySamuel Whiteside (1783-1868), state legislator and militia leader58,498685 sq mi
(1,774 km2)
State map highlighting Whiteside County
Will County197Joliet1836Cook and Iroquois CountyConrad Will (1779-1835),[5] physician, local businessman and longtime member of the state legislature677,560837 sq mi
(2,168 km2)
State map highlighting Will County
Williamson County199Marion1839Franklin CountyHugh Williamson (1735-1819), delegate from North Carolina to the Philadelphia Convention66,357424 sq mi
(1,098 km2)
State map highlighting Williamson County
Winnebago County201Rockford1836Jo DaviessWinnebago Native Americans295,266514 sq mi
(1,331 km2)
State map highlighting Winnebago County
Woodford County203Eureka1841Tazewell and McLean CountyGen. William Woodford (1734-80), brigadier general in the American Revolutionary War who died while a British prisoner38,664528 sq mi
(1,368 km2)
State map highlighting Woodford County

Defunct counties[edit]

See also[edit]

Notes[edit]

  1. ^ "EPA County FIPS Code Listing". EPA.gov. 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 Trails.com. Genealogy Trails. 2000. Retrieved 2008-09-21. 
  4. ^ "The Origin of Illinois County Names". Genealogy Trails.com. 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. 

References[edit]

External links[edit]