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List of counties in Illinois
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==Counties== ''Note: the links in the [[FIPS county code|FIPS County Code]] column are to the [[United States Census Bureau]] page for that county.'' {{Clear}} {{Countytabletop | region_width = | fips_ref = <ref name="FIPS">{{cite web |url=https://www2.census.gov/programs-surveys/popest/geographies/2019/all-geocodes-v2019.xlsx |title=U.S. Census Bureau 2019 FIPS Codes |work=census.gov |access-date=January 8, 2021 }}</ref> | region_seat_title = County seat | region_seat_width = | region_seat_ref = <ref name="NACO">{{cite web|url=https://ce.naco.org/?find=true|title=County Explorer|publisher=[[National Association of Counties]]|access-date=January 8, 2021}}</ref> | data2_title = {{abbr|Est.|Established}} | data2_width = | data2_ref = <ref name="NACO">{{cite web|url=https://ce.naco.org/?find=true|title=County Explorer|publisher=[[National Association of Counties]]|access-date=January 8, 2021}}</ref> | data3_title = Origin | data3_width = | data3_ref = | data4_title = Etymology | data4_width = | data4_ref = <ref>{{cite web |url=http://genealogytrails.com/ill/cobiosad.htm|title=Illinois County Biographies |access-date=September 21, 2008 |work=Genealogy Trails.com|publisher=Genealogy Trails|year=2000 }}</ref><ref>{{cite web |url=http://genealogytrails.com/ill/ilcohx.htm|title=The Origin of Illinois County Names|access-date=September 21, 2008 |work=Genealogy Trails.com|publisher=Genealogy Trails |year=2000 }}</ref> | data4_unsortable = yes | population_ref = <ref>{{cite web |url=https://www.census.gov/quickfacts/fact/table/IL/PST045219 |title=U.S. Census Bureau QuickFacts: Illinois |access-date=March 15, 2025 }}</ref> | area_ref = <ref name="NACO"/> }} {{Countyrow|N=17|Num=001| Name=Adams| Seat=Quincy| Data2=1825| Data3=Pike County |Data4=[[John Quincy Adams]] (1767β1848), sixth [[President of the United States]] | Population=64109| Area=855| Size=60px}} {{Countyrow|N=17|Num=003| Name=Alexander| Seat=Cairo| Data2=1819| Data3=Union County |Data4=[[William Melville Alexander (Illinois politician)|William M. Alexander]], settler and state representative in the [[Illinois General Assembly]] | Population=4594| Area=236| Size=60px}} {{Countyrow|N=17|Num=005| Name=Bond| Seat=Greenville| Data2=1817| Data3=Crawford County, Edwards County, and Madison County |Data4=[[Shadrach Bond]] (1773β1832), first [[Governor of Illinois]] | Population=16576| Area=380| Size=60px}} {{Countyrow|N=17|Num=007| Name=Boone| Seat=Belvidere| Data2=1837| Data3=Winnebago County |Data4=[[Daniel Boone]] (1734β1820), trailblazer of the [[Wilderness Road]] in Kentucky | Population=53313| Area=280| Size=60px}} {{Countyrow|N=17|Num=009| Name=Brown| Seat=Mount Sterling| Data2=1839| Data3=Schuyler County |Data4=[[Jacob Brown (general)|Jacob Brown]] (1775β1828), successful [[War of 1812]] army officer responsible for Great Lakes defenses | Population=6307| Area=305| Size=60px}} {{Countyrow|N=17|Num=011| Name=Bureau| Seat=Princeton| Data2=1837| Data3=Putnam County |Data4=Pierre de Bureo, Frenchman, [[Fur trade#North American fur trade|North American fur trader]]| Population=32486| Area=869| Size=60px}} {{Countyrow|N=17|Num=013| Name=Calhoun| Seat=Hardin| Data2=1825| Data3=Pike County |Data4=[[John C. Calhoun]] (1782β1850), [[South Carolina]] senator and seventh [[Vice President of the United States]] | Population=4224| Area=253| Size=60px}} {{Countyrow|N=17|Num=015| Name=Carroll| Seat=Mount Carroll| Data2=1839| Data3=Jo Daviess |Data4=[[Charles Carroll of Carrollton]] (1737β1832), signed the [[United States Declaration of Independence|Declaration of Independence]] on behalf of [[Maryland]] | Population=15444| Area=445| Size=60px}} {{Countyrow|N=17|Num=017| Name=Cass| Seat=Virginia| Data2=1837| Data3=Morgan County |Data4=[[Lewis Cass]] (1782β1866), second governor of [[Michigan Territory]], fourteenth [[United States Secretary of War]] | Population=12713| Area=375| Size=60px}} {{Countyrow|N=17|Num=019| Name=Champaign| Seat=Urbana| Data2=1833| Data3=Vermilion County |Data4=[[Champaign County, Ohio]], which took its name from the [[French language|French]] for "open level country" | Population=212374| Area=996| Size=60px}} {{Countyrow|N=17|Num=021| Name=Christian| Seat=Taylorville| Data2=1839| Data3=Sangamon County |Data4= [[Christian County, Kentucky]], which was named after [[William Christian (Virginia politician)|William Christian]] | Population=33247| Area=709| Size=60px}} {{Countyrow|N=17|Num=023| Name=Clark| Seat=Marshall| Data2=1819| Data3=Crawford County |Data4=[[George Rogers Clark]] (1752β1818), highest-ranking officer in the [[Northwest Territory]] during the [[American Revolution]] | Population=15076| Area=501| Size=60px}} {{Countyrow|N=17|Num=025| Name=Clay| Seat=Louisville| Data2=1824| Data3=Wayne, Lawrence, Fayette, and Crawford County |Data4=[[Henry Clay]] (1777β1852), Kentucky legislator who negotiated the [[Missouri Compromise]] | Population=12821| Area=468| Size=60px}} {{Countyrow|N=17|Num=027| Name=Clinton| Seat=Carlyle| Data2=1824| Data3=Washington, Bond, and Fayette County |Data4=[[DeWitt Clinton]] (1769β1828), [[List of Governors of New York|Governor of New York]], responsible for the construction of the [[Erie Canal]] | Population=37087| Area=474| Size=60px}} {{Countyrow|N=17|Num=029| Name=Coles| Seat=Charleston| Data2=1830| Data3=Clark and Edgar County |Data4=[[Edward Coles]] (1786β1868), second [[Governor of Illinois]], responsible for the abolition of slavery in Illinois | Population=46423| Area=508| Size=60px}} {{Countyrow|N=17|Num=031| Name=Cook| Seat=Chicago| Data2=1831| Data3=Putnam County |Data4=[[Daniel Pope Cook]] (1794β1827), politician and first [[Illinois Attorney General|Attorney General of Illinois]] | Population=5182617| Area=944| Size=60px}} {{Countyrow|N=17|Num=033| Name=Crawford| Seat=Robinson| Data2=1816| Data3=Edwards County |Data4=[[William H. Crawford]] (1772β1834), ninth [[United States Secretary of War]], seventh [[United States Secretary of the Treasury|Secretary of the Treasury]] | Population=18388| Area=443| Size=60px}} {{Countyrow|N=17|Num=035| Name=Cumberland| Seat=Toledo| Data2=1843| Data3=Coles County |Data4=''Disputed'': [[National Road|Cumberland Road]], which entered the county; [[Cumberland, Maryland]]; or [[Cumberland River]] in Kentucky | Population=10305| Area=345| Size=60px}} {{Countyrow|N=17|Num=037| Name=DeKalb| Seat=Sycamore| Data2=1837| Data3=Kane County |Data4=[[Johann de Kalb]] (1721β1780), German officer in the [[Continental Army]] who fought alongside [[Gilbert du Motier, marquis de Lafayette]] | Population=101335| Area=631| Size=60px}} {{Countyrow|N=17|Num=039| Name=DeWitt| Seat=Clinton| Data2=1839| Data3=Macon and McLean County |Data4=[[DeWitt Clinton]] (1769β1828), [[List of Governors of New York|Governor of New York]], responsible for the construction of the [[Erie Canal]] | Population=15319| Area=397| Size=60px|Map=Map of Illinois highlighting DeWitt County.svg}} {{Countyrow|N=17|Num=041| Name=Douglas| Seat=Tuscola| Data2=1859| Data3=Coles County |Data4=[[Stephen A. Douglas]] (1813β1861), prominent Illinois Democrat who [[LincolnβDouglas debates|engaged in debates]] with [[Abraham Lincoln]] | Population=19824| Area=416| Size=60px}} {{Countyrow|N=17|Num=043| Name=DuPage| Seat=Wheaton| Data2=1839| Data3=Cook County |Data4=[[DuPage River]] | Population=937142| Area=327| Size=60px}} {{Countyrow|N=17|Num=045| Name=Edgar| Seat=Paris| Data2=1823| Data3=Clark County |Data4=[[John Edgar (politician)|John Edgar]] ({{abbr|c.|circa}} 1750β1832), Illinois delegate to the [[Northwest Territory]] legislature; at the time, wealthiest man in Illinois | Population=16398| Area=623| Size=60px}} {{Countyrow|N=17|Num=047| Name=Edwards| Seat=Albion| Data2=1814| Data3=Gallatin County and Madison County |Data4=[[Ninian Edwards]] (1775β1833), third [[Governor of Illinois|Governor of the State of Illinois]] and only governor of the [[Illinois Territory]] | Population=5984| Area=222| Size=60px}} {{Countyrow|N=17|Num=049| Name=Effingham| Seat=Effingham| Data2=1831| Data3=Fayette and Crawford County |Data4= [[Thomas Howard, 3rd Earl of Effingham]], military officer who resigned from the [[British Army]] to avoid fighting the American colonies | Population=34602| Area=478| Size=60px}} {{Countyrow|N=17|Num=051| Name=Fayette| Seat=Vandalia| Data2=1821| Data3=Bond, Wayne, Clark, Jefferson, and Crawford County |Data4=[[Gilbert du Motier, marquis de Lafayette]] (1757β1834), French military officer who was a key factor in the [[American Revolution|American]] and [[French Revolution]]s. | Population=21157| Area=716| Size=60px}} {{Countyrow|N=17|Num=053| Name=Ford| Seat=Paxton| Data2=1859| Data3=Vermilion County |Data4=[[Thomas Ford (politician)|Thomas Ford]] (1800β1850), eighth [[Governor of Illinois]]; served during the [[History of Nauvoo, Illinois|Illinois Mormon War]] | Population=13451| Area=485| Size=60px}} {{Countyrow|N=17|Num=055| Name=Franklin| Seat=Benton| Data2=1818| Data3=White County and Gallatin County |Data4=[[Benjamin Franklin]] (1706β1790), prolific writer, inventor, and politician; key factor in the [[American Revolution]] | Population=37033| Area=408| Size=60px}} {{Countyrow|N=17|Num=057| Name=Fulton| Seat=Lewistown| Data2=1823| Data3=Pike County |Data4=[[Robert Fulton]] (1765β1815), inventor of the [[steamboat]] | Population=32510| Area=865| Size=60px}} {{Countyrow|N=17|Num=059| Name=Gallatin| Seat=Shawneetown| Data2=1812| Data3=Randolph County |Data4=[[Albert Gallatin]] (1761β1849), fourth and longest-serving [[United States Secretary of the Treasury]] | Population=4690| Area=322| Size=60px}} {{Countyrow|N=17|Num=061| Name=Greene| Seat=Carrollton| Data2=1821| Data3=Madison County |Data4=[[Nathanael Greene]] (1742β1786), major general in the [[Continental Army]] | Population=11417| Area=543| Size=60px}} {{Countyrow|N=17|Num=063| Name=Grundy| Seat=Morris| Data2=1841| Data3=LaSalle County |Data4=[[Felix Grundy]] (1777β1840), [[Tennessee|Tennessean]] senator who served as the thirteenth [[United States Attorney General]] | Population=53835| Area=418| Size=60px}} {{Countyrow|N=17|Num=065| Name=Hamilton| Seat=McLeansboro| Data2=1821| Data3=White County |Data4=[[Alexander Hamilton]] (1755β1804), first [[United States Secretary of the Treasury]] | Population=7818| Area=434| Size=60px}} {{Countyrow|N=17|Num=067| Name=Hancock| Seat=Carthage| Data2=1825| Data3=Adams County |Data4=[[John Hancock]] (1737β1793), first governor of the [[Massachusetts|Massachusetts colony]] and president of the [[Second Continental Congress]] | Population=17008| Area=793| Size=60px}} {{Countyrow|N=17|Num=069| Name=Hardin| Seat=Elizabethtown| Data2=1839| Data3=Pope County |Data4=[[Hardin County, Kentucky]], which was named after [[John Hardin]] | Population=3550| Area=177| Size=60px}} {{Countyrow|N=17|Num=071| Name=Henderson| Seat=Oquawka| Data2=1841| Data3=Warren County |Data4=[[Henderson County, Kentucky]], which was named after [[Richard Henderson (jurist)|Richard Henderson]] | Population=6048| Area=378| Size=60px}} {{Countyrow|N=17|Num=073| Name=Henry| Seat=Cambridge| Data2=1825| Data3=Fulton County |Data4=[[Patrick Henry]] (1736β1799), [[American Revolutionary War]] figure; first and sixth [[Governor of Virginia]] | Population=48177| Area=822| Size=60px}} {{Countyrow|N=17|Num=075| Name=Iroquois| Seat=Watseka| Data2=1833| Data3=Vermilion County |Data4=[[Iroquois]] Native Americans | Population=26067| Area=1117| Size=60px}} {{Countyrow|N=17|Num=077| Name=Jackson| Seat=Murphysboro| Data2=1816| Data3=Randolph County and Johnson County |Data4=[[Andrew Jackson]] (1767β1845), seventh [[President of the United States]], United States Senator from [[Tennessee]], and general in the [[War of 1812]] | Population=53199| Area=584| Size=60px}} {{Countyrow|N=17|Num=079| Name=Jasper| Seat=Newton| Data2=1831| Data3=Clay and Crawford County |Data4=Sgt. [[William Jasper]] ({{abbr|c.|circa}} 1750β1779), [[American Revolutionary War]] soldier popularized by [[Parson Weems]] | Population=9092| Area=494| Size=60px}} {{Countyrow|N=17|Num=081| Name=Jefferson| Seat=Mount Vernon| Data2=1819| Data3=Edwards and White County |Data4=[[Thomas Jefferson]] (1743β1826), 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]] | Population=36107| Area=571| Size=60px}} {{Countyrow|N=17|Num=083| Name=Jersey| Seat=Jerseyville| Data2=1839| Data3=Greene County |Data4=State of [[New Jersey]], from which many early settlers hailed | Population=21150| Area=369| Size=60px}} {{Countyrow|N=17|Num=085| Name=Jo Daviess| Seat=Galena| Data2=1827| Data3=Henry, Mercer, and Putnam County |Data4=[[Joseph Hamilton Daveiss]] (1774β1811), commander of the Indiana Dragoons at the [[Battle of Tippecanoe]] | Population=21528| Area=600| Size=60px}} {{Countyrow|N=17|Num=087| Name=Johnson| Seat=Vienna| Data2=1812| Data3=Randolph County |Data4=[[Richard Mentor Johnson]] ({{abbr|c.|circa}} 1780β1850), ninth [[Vice President of the United States]] and United States Senator from [[Kentucky]] | Population=13320| Area=343| Size=60px}} {{Countyrow|N=17|Num=089| Name=Kane| Seat=Geneva| Data2=1836| Data3=LaSalle County |Data4=[[Elias Kane]] (1794β1835), United States Senator from [[Illinois]] | Population=520997| Area=519| Size=60px}} {{Countyrow|N=17|Num=091| Name=Kankakee| Seat=Kankakee| Data2=1853| Data3=Iroquois and Will County |Data4=[[Kankakee River]] | Population=106410| Area=676| Size=60px}} {{Countyrow|N=17|Num=093| Name=Kendall| Seat=Yorkville| Data2=1841| Data3=LaSalle and Kane County |Data4=[[Amos Kendall]] (1789β1869), [[United States Postmaster General]] under Presidents [[Andrew Jackson]] and [[Martin Van Buren]] | Population=143171| Area=320| Size=60px}} {{Countyrow|N=17|Num=095| Name=Knox| Seat=Galesburg| Data2=1825| Data3=Fulton County |Data4=Gen. [[Henry Knox]] (1750β1806), [[American Revolutionary War]] general and first [[United States Secretary of War]] | Population=48716| Area=716| Size=60px}} {{Countyrow|N=17|Num=097| Name=Lake| Seat=Waukegan| Data2=1839| Data3=McHenry County |Data4=[[Lake Michigan]] | Population=718604| Area=443| Size=60px}} {{Countyrow|N=17|Num=099| Name=LaSalle| Seat=Ottawa| Data2=1831| Data3=Putnam and Tazewell County |Data4=[[RenΓ©-Robert Cavelier, Sieur de La Salle|Sieur de la Salle]] (1643β1687), French explorer of the [[Great Lakes]] | Population=108390| Area=1135| Size=60px}} {{Countyrow|N=17|Num=101| Name=Lawrence| Seat=Lawrenceville| Data2=1821| Data3=Crawford and Edwards County |Data4=Capt. [[James Lawrence]] (1781β1813), commander of the {{USS|Chesapeake|1799|6}} in the [[War of 1812]]. Famous for his command "Don't give up the ship!" | Population=14801| Area=372| Size=60px}} {{Countyrow|N=17|Num=103| Name=Lee| Seat=Dixon| Data2=1839| Data3=Ogle County |Data4="Light Horse" [[Henry Lee III]] (1756β1818), [[American Revolutionary War]] officer and ninth [[Governor of Virginia]] | Population=33544| Area=724| Size=60px}} {{Countyrow|N=17|Num=105| Name=Livingston| Seat=Pontiac| Data2=1837| Data3=LaSalle and McLean County |Data4=[[Edward Livingston]] (1764β1836), prominent jurist, Congressman from [[New York (state)|New York]] and [[Louisiana]], and [[U.S. Secretary of State]] from 1831-33 | Population=35375| Area=1043| Size=60px}} {{Countyrow|N=17|Num=107| Name=Logan| Seat=Lincoln| Data2=1839| Data3=Sangamon County |Data4=John Logan, country doctor and early settler, and the father of [[John A. Logan]] | Population=27518| Area=618| Size=60px}} {{Countyrow|N=17|Num=115| Name=Macon| Seat=Decatur| Data2=1829| Data3=Shelby County |Data4=[[Nathaniel Macon]] (1758β1837), sixth [[Speaker of the United States House of Representatives]] and [[United States Senator]] from [[North Carolina]] | Population=100737| Area=580| Size=60px}} {{Countyrow|N=17|Num=117| Name=Macoupin| Seat=Carlinville| Data2=1829| Data3=Greene County |Data4=Native American word ''macoupin'', meaning "[[American lotus]]" | Population=43895| Area=862| Size=60px}} {{Countyrow|N=17|Num=119| Name=Madison| Seat=Edwardsville| Data2=1812| Data3=St. Clair County and Randolph County |Data4=[[James Madison]] (1751β1836), fourth [[President of the United States]] and principal author of the [[Constitution of the United States]] | Population=263017| Area=716| Size=60px}} {{Countyrow|N=17|Num=121| Name=Marion| Seat=Salem| Data2=1823| Data3=Fayette and Jefferson County |Data4=[[Francis Marion]] ({{abbr|c.|circa}} 1732β1795), general in the [[American Revolutionary War]] known as "The Swamp Fox" | Population=36437| Area=572| Size=60px}} {{Countyrow|N=17|Num=123| Name=Marshall| Seat=Lacon| Data2=1839| Data3=Putnam County |Data4=John Marshall (1755β1835), fourth and longest-serving [[Chief Justice of the United States]], wrote opinion in ''[[Marbury v. Madison]]'' establishing the principle of [[judicial review]] | Population=11552| Area=386| Size=60px}} {{Countyrow|N=17|Num=125| Name=Mason| Seat=Havana| Data2=1841| Data3=Tazewell and Menard County |Data4=Named after [[Mason County, Kentucky]], itself named after [[George Mason]] | Population=12543| Area=539| Size=60px}} {{Countyrow|N=17|Num=127| Name=Massac| Seat=Metropolis| Data2=1843| Data3=Pope and Johnson County |Data4=[[Fort Massac]], a colonial-era fort on the [[Ohio River]] | Population=13627| Area=237| Size=60px}} {{Countyrow|N=17|Num=109| Name=McDonough| Seat=Macomb| Data2=1826| Data3=Schuyler County |Data4=Commodore [[Thomas Macdonough]] (1783β1825), commander of American naval forces at the [[Battle of Plattsburgh]] | Population=26662| Area=589| Size=60px}} {{Countyrow|N=17|Num=111| Name=McHenry| Seat=Woodstock| Data2=1836| Data3=Cook and LaSalle County |Data4=Major [[William McHenry]] ({{abbr|c.|circa}} 1771β1835), officer during several campaigns against [[Indigenous peoples of the Americas|Native Americans]] and was a member of the Illinois legislature | Population=315959| Area=603| Size=60px}} {{Countyrow|N=17|Num=113| Name=McLean| Seat=Bloomington| Data2=1830| Data3=Tazewell County |Data4=[[John McLean (Illinois politician)|John McLean]] (1791β1830), [[United States Representative]] and [[United States Senator]] from Illinois (the latter from 1824β25 and 1829β30)| Population=172069| Area=1183| Size=60px}} {{Countyrow|N=17|Num=129| Name=Menard| Seat=Petersburg| Data2=1839| Data3=Sangamon County |Data4=[[Pierre Menard]] (1766β1844), prominent early settler and first [[Lieutenant Governor of Illinois]] | Population=11963| Area=314| Size=60px}} {{Countyrow|N=17|Num=131| Name=Mercer| Seat=Aledo| Data2=1825| Data3=Schuyler County |Data4=[[Hugh Mercer]] (1726β1777), British officer in the [[Seven Years' War]] and general in the [[Continental Army]] during the [[American Revolutionary War]] | Population=15292| Area=561| Size=60px}} {{Countyrow|N=17|Num=133| Name=Monroe| Seat=Waterloo| Data2=1816| Data3=Randolph County and St. Clair County |Data4=[[James Monroe]] (1758β1831), seventh [[United States Secretary of State]], eighth [[United States Secretary of War]], [[Governor of Virginia]], and fifth [[President of the United States]] | Population=34969| Area=385| Size=60px}} {{Countyrow|N=17|Num=135| Name=Montgomery| Seat=Hillsboro| Data2=1821| Data3=Bond and Madison County |Data4=Gen. [[Richard Montgomery]] (1738β1775), brigadier-general in the [[Continental Army]] who led the unsuccessful [[Invasion of Canada (1775)|invasion of Canada]] | Population=27615| Area=703| Size=60px}} {{Countyrow|N=17|Num=137| Name=Morgan| Seat=Jacksonville| Data2=1823| Data3=Sangamon County |Data4=Gen. [[Daniel Morgan]] (1736β1802), successful tactician in the [[American Revolutionary War]] and later [[United States Representative]] from [[Virginia]]| Population=32618| Area=568| Size=60px}} {{Countyrow|N=17|Num=139| Name=Moultrie| Seat=Sullivan| Data2=1843| Data3=Shelby and Macon County |Data4=Gen. [[William Moultrie]] (1730β1805), [[American Revolutionary War]] general and [[Governor of South Carolina]] | Population=14365| Area=335| Size=60px}} {{Countyrow|N=17|Num=141| Name=Ogle| Seat=Oregon| Data2=1836| Data3=Jo Daviess |Data4=[[Joseph Ogle]] (1737β1821), early settler in southwest Illinois, who helped found the first [[Methodism|Methodist]] church in Illinois | Population=51345| Area=758| Size=60px}} {{Countyrow|N=17|Num=143| Name=Peoria| Seat=Peoria| Data2=1825| Data3=Fulton County |Data4=The [[Peoria tribe|Peoria]] Native American tribe | Population=179630| Area=618| Size=60px}} {{Countyrow|N=17|Num=145| Name=Perry| Seat=Pinckneyville| Data2=1827| Data3=Randolph and Jackson County |Data4=Cmdre. [[Oliver Hazard Perry]] (1785β1819), American naval officer who led the victorious American forces at the [[Battle of Lake Erie]] | Population=20272| Area=441| Size=60px}} {{Countyrow|N=17|Num=147| Name=Piatt| Seat=Monticello| Data2=1841| Data3=DeWitt and Macon County |Data4=James A. Piatt, the patriarch of a prominent settler family in the early history of the county | Population=16628| Area=439| Size=60px}} {{Countyrow|N=17|Num=149| Name=Pike| Seat=Pittsfield| Data2=1821| Data3=Madison, Bond, and Clark County |Data4=[[Zebulon Pike]] (1779β1813), early explorer of the [[American Southwest]], namesake of [[Pikes Peak]] | Population=14258| Area=831| Size=60px}} {{Countyrow|N=17|Num=151| Name=Pope| Seat=Golconda| Data2=1816| Data3=Gallatin and Johnson County |Data4=[[Nathaniel Pope]] (1784β1850), early Delegate from [[Illinois Territory]] to Congress and judge on the [[United States District Court for the District of Illinois]] | Population=3703| Area=368| Size=60px}} {{Countyrow|N=17|Num=153| Name=Pulaski| Seat=Mound City| Data2=1843| Data3=Alexander and Johnson County |Data4=Gen. [[Casimir Pulaski]] (1745β1779), [[Polish American]] general of cavalry in the [[American Revolutionary War]] | Population=4879| Area=199| Size=60px}} {{Countyrow|N=17|Num=155| Name=Putnam| Seat=Hennepin| Data2=1825| Data3=Fulton County |Data4=Gen. [[Israel Putnam]] (1718β1790), commander of American forces at the [[Battle of Bunker Hill]] | Population=5633| Area=160| Size=60px}} {{Countyrow|N=17|Num=157| Name=Randolph| Seat=Chester| Data2=1795| Data3=St. Clair County |Data4=[[Edmund Randolph]] (1753β1813), first [[Attorney General of the United States]], and briefly [[United States Secretary of State]] | Population=29903| Area=575| Size=60px}} {{Countyrow|N=17|Num=159| Name=Richland| Seat=Olney| Data2=1841| Data3=Clay and Lawrence County |Data4=[[Richland County, Ohio]], itself named for its rich [[soil]] | Population=15362| Area=360| Size=60px}} {{Countyrow|N=17|Num=161| Name=Rock Island| Seat=Rock Island| Data2=1831| Data3=Jo Daviess County |Data4=[[Rock Island Arsenal|Rock Island]] | Population=142731| Area=427| Size=60px}} {{Countyrow|N=17|Num=165| Name=Saline| Seat=Harrisburg| Data2=1847| Data3=Gallatin County |Data4=The [[Saline River (Illinois)|Saline River]] and salt springs in the county | Population=22826| Area=379| Size=60px}} {{Countyrow|N=17|Num=167| Name=Sangamon| Seat=Springfield| Data2=1821| Data3=Madison and Bond County |Data4=[[Sangamon River]] | Population=194345| Area=868| Size=60px}} {{Countyrow|N=17|Num=169| Name=Schuyler| Seat=Rushville| Data2=1825| Data3=Pike and Fulton County |Data4=Gen. [[Philip Schuyler]] (1733β1804), [[American Revolutionary War]] general and [[United States Senator]] from [[New York (state)|New York]] | Population=6750| Area=437| Size=60px}} {{Countyrow|N=17|Num=171| Name=Scott| Seat=Winchester| Data2=1839| Data3=Morgan County |Data4=[[Scott County, Kentucky]], itself named after [[Charles Scott (governor)|Charles Scott]] | Population=4880| Area=250| Size=60px}} {{Countyrow|N=17|Num=173| Name=Shelby| Seat=Shelbyville| Data2=1827| Data3=Fayette County |Data4=[[Isaac Shelby]] (1750β1826), soldier in the [[American Revolutionary War]] and [[War of 1812]]; first and fifth [[Governor of Kentucky]] | Population=20542| Area=758| Size=60px}} {{Countyrow|N=17|Num=163| Name=St. Clair| Seat=Belleville| Data2=1790| Data3=original two counties |Data4=[[Arthur St. Clair]] (1737β1818), major general in the [[American Revolutionary War]] and first Governor of the [[Northwest Territory]] | Population=251149| Area=657| Size=60px}} {{Countyrow|N=17|Num=175| Name=Stark| Seat=Toulon| Data2=1839| Data3=Knox and Putnam County |Data4=Gen. [[John Stark]] (1728β1822), general in the [[American Revolutionary War]], called the "Hero of [[Battle of Bennington|Bennington]]" | Population=5272| Area=288| Size=60px}} {{Countyrow|N=17|Num=177| Name=Stephenson| Seat=Freeport| Data2=1837| Data3=Jo Daviess and Winnebago County |Data4=[[Benjamin Stephenson (politician)|Benjamin Stephenson]] (1769β1822), representative of [[Illinois Territory]] in the [[United States Congress]] from 1814 to 1816 | Population=43088| Area=564| Size=60px}} {{Countyrow|N=17|Num=179| Name=Tazewell| Seat=Pekin| Data2=1827| Data3=Sangamon County |Data4=[[Littleton Waller Tazewell]] (1774β1860), United States Senator from (and later governor of) [[Virginia]] | Population=129821| Area=646| Size=60px}} {{Countyrow|N=17|Num=181| Name=Union| Seat=Jonesboro| Data2=1818| Data3=Johnson County |Data4=The union of the [[United States]] | Population=16886| Area=413| Size=60px}} {{Countyrow|N=17|Num=183| Name=Vermilion| Seat=Danville| Data2=1826| Data3=Edgar County |Data4=The [[Vermilion River (Wabash River tributary)|Vermilion River]] | Population=71106| Area=898| Size=60px}} {{Countyrow|N=17|Num=185| Name=Wabash| Seat=Mount Carmel| Data2=1824| Data3=Edwards County |Data4=The [[Wabash River]] | Population=10979| Area=223| Size=60px}} {{Countyrow|N=17|Num=187| Name=Warren| Seat=Monmouth| Data2=1825| Data3=Schuyler County |Data4=[[Joseph Warren]] (1741β1775), played a role in [[American Patriot]] movements, a prominent early fatality in the [[American Revolutionary War]] | Population=16217| Area=542| Size=60px}} {{Countyrow|N=17|Num=189| Name=Washington| Seat=Nashville| Data2=1818| Data3=St. Clair County |Data4=[[George Washington]] (1732β1799), commander-in-chief of American forces in the [[American Revolutionary War]] and first [[President of the United States]] | Population=13535| Area=562| Size=60px}} {{Countyrow|N=17|Num=191| Name=Wayne| Seat=Fairfield| Data2=1819| Data3=Edwards County |Data4=Gen. "Mad" [[Anthony Wayne]] (1745β1796), [[major general]] in the United States Army in the [[American Revolutionary War]] and the [[Northwest Indian War]] | Population=15928| Area=713| Size=60px}} {{Countyrow|N=17|Num=193| Name=White| Seat=Carmi| Data2=1815| Data3=Gallatin County |Data4=[[Isaac White (militia colonel)|Isaac White]] (1776β1811), resident of Illinois who enlisted in the Indiana militia and was killed at the [[Battle of Tippecanoe]] | Population=13395| Area=494| Size=60px}} {{Countyrow|N=17|Num=195| Name=Whiteside| Seat=Morrison| Data2=1836| Data3=Jo Daviess and Henry County |Data4=[[Samuel Whiteside]] (1783β1868), state legislator and militia leader | Population=54657| Area=684| Size=60px}} {{Countyrow|N=17|Num=197| Name=Will| Seat=Joliet| Data2=1836| Data3=Cook and Iroquois County |Data4=[[Conrad Will (politician)|Conrad Will]] (1779β1835),<ref>{{cite news|last=Matile|first=Roger|title=Reflections: Was Dr. Conrad Will really worth his salt?|url=http://www.ledgersentinel.com/article.asp?a=5216|access-date=October 11, 2011|newspaper=Ledger-Sentinel|date=June 22, 2006}}</ref> physician, local businessman and longtime member of the state legislature | Population=708583| Area=835| Size=60px}} {{Countyrow|N=17|Num=199| Name=Williamson| Seat=Marion| Data2=1839| Data3=Franklin County |Data4=[[Williamson County, Tennessee]], which was named for [[Hugh Williamson]] | Population=67064| Area=420| Size=60px}} {{Countyrow|N=17|Num=201| Name=Winnebago| Seat=Rockford| Data2=1836| Data3=Jo Daviess County |Data4=[[Winnebago (tribe)|Winnebago]] Native Americans | Population=283790| Area=513| Size=60px}} {{Countyrow|N=17|Num=203| Name=Woodford| Seat=Eureka| Data2=1841| Data3=Tazewell and McLean County |Data4=[[Woodford County, Kentucky]], which was named for [[William Woodford]] | Population=38290| Area=527| Size=60px}} |}
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