Alphabetical List
Note: the links in the FIPS County Code column are to the Census Bureau info page for that county.
| County |
FIPS code |
County seat |
Established |
Origin |
Etymology |
Population |
Area |
Map |
|---|---|---|---|---|---|---|---|---|
| Adams County | 001 | Quincy | 1825 | Pike County | John Quincy Adams (1767–1848), sixth President of the United States | 700467103000000000067,103 | 7002857000000000000857 sq mi (70032220000000000002,220 km2) |
|
| Alexander County | 003 | Cairo | 1819 | Union County | William M. Alexander, a settler and state representative in the Illinois General Assembly | 70038238000000000008,238 | 7002236000000000000236 sq mi (7002611000000000000611 km2) |
|
| Bond County | 005 | Greenville | 1817 | Crawford County, Edwards County, and Madison County | Shadrach Bond (1773–1832), First Governor of Illinois | 700417768000000000017,768 | 7002380000000000000380 sq mi (7002984000000000000984 km2) |
|
| Boone County | 007 | Belvidere | 1837 | Winnebago County | Daniel Boone (1734-1820), trailblazer of the Wilderness Road in Kentucky | 700454165000000000054,165 | 7002281000000000000281 sq mi (7002728000000000000728 km2) |
|
| Brown County | 009 | Mount Sterling | 1839 | Schuyler County | Jacob Brown (1775–1828), a successful American Revolution army officer responsible for Great Lakes defenses | 70036937000000000006,937 | 7002306000000000000306 sq mi (7002793000000000000793 km2) |
|
| Bureau County | 011 | Princeton | 1837 | Putnam County | Pierre de Bureo, Frenchman, North American fur trader | 700434978000000000034,978 | 7002869000000000000869 sq mi (70032251000000000002,251 km2) |
|
| Calhoun County | 013 | Hardin | 1825 | Pike County | John C. Calhoun (1782–1850), South Carolina senator and seventh Vice President of the United States | 70035089000000000005,089 | 7002254000000000000254 sq mi (7002658000000000000658 km2) |
|
| Carroll County | 015 | Mount Carroll | 1839 | Jo Daviess | Charles Carroll of Carrollton (1737–1832), signed the Declaration of Independence on behalf of Maryland | 700415387000000000015,387 | 7002444000000000000444 sq mi (70031150000000000001,150 km2) |
|
| Cass County | 017 | Virginia | 1837 | Morgan County | Lewis Cass (1782–1866), second governor of Michigan Territory, fourteenth United States Secretary of War | 700413642000000000013,642 | 7002376000000000000376 sq mi (7002974000000000000974 km2) |
|
| Champaign County | 019 | Urbana | 1833 | Vermilion County | Champaign County, Ohio, which took its name from the French for "open level country" | 7005201081000000000201,081 | 7002997000000000000997 sq mi (70032582000000000002,582 km2) |
|
| Christian County | 021 | Taylorville | 1839 | Sangamon County | Christian County, Kentucky, which was itself named after Colonel William Christian | 700434800000000000034,800 | 7002709000000000000709 sq mi (70031836000000000001,836 km2) |
|
| Clark County | 023 | Marshall | 1819 | Crawford County | George Rogers Clark (1752–1818), highest-ranking officer in the Northwest Territory during the American Revolution | 700416335000000000016,335 | 7002502000000000000502 sq mi (70031300000000000001,300 km2) |
|
| Clay County | 025 | Louisville | 1824 | Wayne, Lawrence, Fayette, and Crawford County | Henry Clay (1777–1852), Kentucky legislator who negotiated the Missouri Compromise | 700413815000000000013,815 | 7002469000000000000469 sq mi (70031215000000000001,215 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 | 700437762000000000037,762 | 7002474000000000000474 sq mi (70031228000000000001,228 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 | 700453873000000000053,873 | 7002508000000000000508 sq mi (70031316000000000001,316 km2) |
|
| Cook County | 031 | Chicago | 1831 | Putnam County | Daniel Pope Cook (1794–1827), politician and first Attorney General of Illinois | 70065194675000000005,194,675 | 7002946000000000000946 sq mi (70032450000000000002,450 km2) |
|
| Crawford County | 033 | Robinson | 1816 | Edwards County | William H. Crawford (1772–1834), ninth United States Secretary of War, seventh Secretary of the Treasury | 700419817000000000019,817 | 7002444000000000000444 sq mi (70031150000000000001,150 km2) |
|
| Cumberland County | 035 | Toledo | 1843 | Coles County | Disputed: Cumberland Road, which entered the county; Cumberland, Maryland; or Cumberland River in Kentucky | 700411048000000000011,048 | 7002346000000000000346 sq mi (7002896000000000000896 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 | 7005105160000000000105,160 | 7002634000000000000634 sq mi (70031642000000000001,642 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 | 700416561000000000016,561 | 7002398000000000000398 sq mi (70031031000000000001,031 km2) |
|
| Douglas County | 041 | Tuscola | 1859 | Coles County | Stephen A. Douglas (1813–1861), prominent Illinois Democrat who engaged in debates with Abraham Lincoln | 700419980000000000019,980 | 7002417000000000000417 sq mi (70031080000000000001,080 km2) |
|
| DuPage County | 043 | Wheaton | 1839 | Cook County | DuPage River | 7005916924000000000916,924 | 7002334000000000000334 sq mi (7002865000000000000865 km2) |
|
| Edgar County | 045 | Paris | 1823 | Clark County | John Edgar (c. 1750–1832), Illinois delegate to the Northwest Territory legislature; at time, wealthiest man in Illinois | 700418576000000000018,576 | 7002624000000000000624 sq mi (70031616000000000001,616 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 | 70036721000000000006,721 | 7002222000000000000222 sq mi (7002575000000000000575 km2) |
|
| Effingham County | 049 | Effingham | 1831 | Fayette and Crawford County | Lord Edward Effingham, military officer who resigned from the British Army to avoid fighting the American colonies | 700434242000000000034,242 | 7002479000000000000479 sq mi (70031241000000000001,241 km2) |
|
| Fayette County | 051 | Vandalia | 1821 | Bond, Wayne, Clark, Jefferson, and Crawford County | Marquis de la Fayette (1757–1834), French military officer who was a key factor in the American and French Revolutions. | 700422140000000000022,140 | 7002716000000000000716 sq mi (70031854000000000001,854 km2) |
|
| Ford County | 053 | Paxton | 1859 | Vermilion County | Thomas Ford (1800–1850), eighth Governor of Illinois; served during the Illinois Mormon War | 700414081000000000014,081 | 7002486000000000000486 sq mi (70031259000000000001,259 km2) |
|
| Franklin County | 055 | Benton | 1818 | White County and Gallatin County | Benjamin Franklin (1706–1790), prolific writer, inventor, and politician; key factor in the American Revolution | 700439561000000000039,561 | 7002412000000000000412 sq mi (70031067000000000001,067 km2) |
|
| Fulton County | 057 | Lewistown | 1823 | Pike County | Robert Fulton (1765–1815), inventor of the steamboat | 700437069000000000037,069 | 7002866000000000000866 sq mi (70032243000000000002,243 km2) |
|
| Gallatin County | 059 | Shawneetown | 1812 | Randolph County | Albert Gallatin (1761–1849), fourth and longest-serving United States Secretary of the Treasury | 70035589000000000005,589 | 7002324000000000000324 sq mi (7002839000000000000839 km2) |
|
| Greene County | 061 | Carrollton | 1821 | Madison County | Nathanael Greene (1742–1786), major general in the Continental Army | 700413886000000000013,886 | 7002543000000000000543 sq mi (70031406000000000001,406 km2) |
|
| Grundy County | 063 | Morris | 1841 | LaSalle County | Felix Grundy (1777–1840), Tennessean senator that served as the thirteenth United States Attorney General | 700450063000000000050,063 | 7002420000000000000420 sq mi (70031088000000000001,088 km2) |
|
| Hamilton County | 065 | McLeansboro | 1821 | White County | Alexander Hamilton (1755–1804), first United States Secretary of the Treasury | 70038457000000000008,457 | 7002435000000000000435 sq mi (70031127000000000001,127 km2) |
|
| Hancock County | 067 | Carthage | 1825 | Adams County | John Hancock (1737–1793), first governor of the Massachusetts colony and president of the Second Continental Congress | 700419104000000000019,104 | 7002795000000000000795 sq mi (70032059000000000002,059 km2) |
|
| Hardin County | 069 | Elizabethtown | 1839 | Pope County | Hardin County, Kentucky, which was itself named after John Hardin | 70034320000000000004,320 | 7002178000000000000178 sq mi (7002461000000000000461 km2) |
|
| Henderson County | 071 | Oquawka | 1841 | Warren County | Henderson County, Kentucky, which was itself named after Richard Henderson | 70037331000000000007,331 | 7002379000000000000379 sq mi (7002982000000000000982 km2) |
|
| Henry County | 073 | Cambridge | 1825 | Fulton County | Patrick Henry (1736-1799), American Revolutionary War figure and first and sixth Governor of Virginia | 700450486000000000050,486 | 7002823000000000000823 sq mi (70032132000000000002,132 km2) |
|
| Iroquois County | 075 | Watseka | 1833 | Vermilion County | Iroquois Native Americans | 700429718000000000029,718 | 70031116000000000001,116 sq mi (70032890000000000002,890 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 | 700460218000000000060,218 | 7002588000000000000588 sq mi (70031523000000000001,523 km2) |
|
| Jasper County | 079 | Newton | 1831 | Clay and Crawford County | Sgt. William Jasper (c. 1750-1779), American Revolutionary War soldier popularized by Parson Weems | 70039698000000000009,698 | 7002494000000000000494 sq mi (70031279000000000001,279 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 | 700438827000000000038,827 | 7002571000000000000571 sq mi (70031479000000000001,479 km2) |
|
| Jersey County | 083 | Jerseyville | 1839 | Greene County | State of New Jersey, from which many early settlers hailed | 700422985000000000022,985 | 7002369000000000000369 sq mi (7002956000000000000956 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 | 700422678000000000022,678 | 7002601000000000000601 sq mi (70031557000000000001,557 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 form Kentucky | 700412582000000000012,582 | 7002346000000000000346 sq mi (7002896000000000000896 km2) |
|
| Kane County | 089 | Geneva | 1836 | LaSalle County | Elias Kane (1794-1835), United States Senator from Illinois | 7005515269000000000515,269 | 7002521000000000000521 sq mi (70031349000000000001,349 km2) |
|
| Kankakee County | 091 | Kankakee | 1853 | Iroquois and Will County | Kankakee River | 7005113449000000000113,449 | 7002678000000000000678 sq mi (70031756000000000001,756 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 | 7005114736000000000114,736 | 7002321000000000000321 sq mi (7002831000000000000831 km2) |
|
| Knox County | 095 | Galesburg | 1825 | Fulton County | Gen. Henry Knox (1750-1806), American Revolutionary War general and first United States Secretary of War | 700452919000000000052,919 | 7002716000000000000716 sq mi (70031854000000000001,854 km2) |
|
| Lake County | 097 | Waukegan | 1839 | McHenry County | Lake Michigan | 7005703462000000000703,462 | 7002448000000000000448 sq mi (70031160000000000001,160 km2) |
|
| LaSalle County | 099 | Ottawa | 1831 | Putnam and Tazewell County | Sieur de la Salle (1643-1687), French explorer of the Great Lakes. | 7005113924000000000113,924 | 70031135000000000001,135 sq mi (70032940000000000002,940 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!" | 700416833000000000016,833 | 7002372000000000000372 sq mi (7002963000000000000963 km2) |
|
| Lee County | 103 | Dixon | 1839 | Ogle County | "Light Horse" Henry Lee III (1756-1818), American Revolutionary War officer and ninth Governor of Virginia | 700436031000000000036,031 | 7002725000000000000725 sq mi (70031878000000000001,878 km2) |
|
| Livingston County | 105 | Pontiac | 1837 | LaSalle and McLean County | Edward Livingston (1764-1836), prominent jurist, Congressman from New York and Louisiana, and U.S. Secretary of State from 1831 to 1833. | 700438950000000000038,950 | 70031044000000000001,044 sq mi (70032704000000000002,704 km2) |
|
| Logan County | 107 | Lincoln | 1839 | Sangamon County | John Logan, a country doctor and early settler, and the father of John A. Logan. | 700430305000000000030,305 | 7002618000000000000618 sq mi (70031601000000000001,601 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. | 7005110768000000000110,768 | 7002581000000000000581 sq mi (70031505000000000001,505 km2) |
|
| Macoupin County | 117 | Carlinville | 1829 | Greene County | Native American word Macoupin, meaning American lotus | 700447765000000000047,765 | 7002864000000000000864 sq mi (70032238000000000002,238 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. | 7005269282000000000269,282 | 7002725000000000000725 sq mi (70031878000000000001,878 km2) |
|
| Marion County | 121 | Salem | 1823 | Fayette and Jefferson County | Francis Marion (c. 1732-1795), general in the American Revolutionary War known as "The Swamp Fox" | 700439437000000000039,437 | 7002572000000000000572 sq mi (70031481000000000001,481 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 | 700412640000000000012,640 | 7002386000000000000386 sq mi (70031000000000000001,000 km2) |
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| Mason County | 125 | Havana | 1841 | Tazewell and Menard County | Named after Mason County, Kentucky, itself named after George Mason | 700414666000000000014,666 | 7002539000000000000539 sq mi (70031396000000000001,396 km2) |
|
| Massac County | 127 | Metropolis | 1843 | Pope and Johnson County | Fort Massac, a colonial-era fort on the Ohio River | 700415429000000000015,429 | 7002239000000000000239 sq mi (7002619000000000000619 km2) |
|
| McDonough County | 109 | Macomb | 1826 | Schuyler County | Commodore Thomas Macdonough (1783-1825), commander of American naval forces at the Battle of Plattsburgh | 700432612000000000032,612 | 7002589000000000000589 sq mi (70031526000000000001,526 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 | 7005308760000000000308,760 | 7002604000000000000604 sq mi (70031564000000000001,564 km2) |
|
| McLean County | 113 | Bloomington | 1830 | Tazewell County | John McLean (1791-1830), United States Representative and United States Senator from Illinois (the latter from 1824-1825 and 1829-1830) | 7005169572000000000169,572 | 70031184000000000001,184 sq mi (70033067000000000003,067 km2) |
|
| Menard County | 129 | Petersburg | 1839 | Sangamon County | Pierre Menard (1766-1844), prominent early settler and first Lieutenant Governor of Illinois | 700412705000000000012,705 | 7002314000000000000314 sq mi (7002813000000000000813 km2) |
|
| Mercer County | 131 | Aledo | 1825 | Schuyler County | Hugh Mercer (1726-1777), British officer in the Seven Years' War and general in the Continental Army during the American Revolutionary War | 700416434000000000016,434 | 7002561000000000000561 sq mi (70031453000000000001,453 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 | 700432957000000000032,957 | 7002388000000000000388 sq mi (70031005000000000001,005 km2) |
|
| Montgomery County | 135 | Hillsboro | 1821 | Bond and Madison County | Gen. Richard Montgomery (1738-1775), brigadier-general in the Continental Army who led the unsuccessful invasion of Canada | 700430104000000000030,104 | 7002704000000000000704 sq mi (70031823000000000001,823 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 | 700435547000000000035,547 | 7002569000000000000569 sq mi (70031474000000000001,474 km2) |
|
| Moultrie County | 139 | Sullivan | 1843 | Shelby and Macon County | Gen. William Moultrie (1730-1805), American Revolutionary War general and Governor of South Carolina | 700414846000000000014,846 | 7002336000000000000336 sq mi (7002870000000000000870 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 | 700453497000000000053,497 | 7002759000000000000759 sq mi (70031966000000000001,966 km2) |
|
| Peoria County | 143 | Peoria | 1825 | Fulton County | The Peoria Native American tribe | 7005186494000000000186,494 | 7002620000000000000620 sq mi (70031606000000000001,606 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 | 700422350000000000022,350 | 7002441000000000000441 sq mi (70031142000000000001,142 km2) |
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| 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 | 700416729000000000016,729 | 7002440000000000000440 sq mi (70031140000000000001,140 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 | 700416430000000000016,430 | 7002830000000000000830 sq mi (70032150000000000002,150 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 | 70034470000000000004,470 | 7002371000000000000371 sq mi (7002961000000000000961 km2) |
|
| Pulaski County | 153 | Mound City | 1843 | Alexander and Johnson County | Gen. Casimir Pulaski (1745-1779), Polish American general of cavalry in the American Revolutionary War | 70036161000000000006,161 | 7002201000000000000201 sq mi (7002521000000000000521 km2) |
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| Putnam County | 155 | Hennepin | 1825 | Fulton County | Gen. Israel Putnam (1718-1790), commander of American forces at the Battle of Bunker Hill | 70036006000000000006,006 | 7002160000000000000160 sq mi (7002414000000000000414 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 | 700433476000000000033,476 | 7002578000000000000578 sq mi (70031497000000000001,497 km2) |
|
| Richland County | 159 | Olney | 1841 | Clay and Lawrence County | Richland County, Ohio, itself named for its rich soil | 700416233000000000016,233 | 7002360000000000000360 sq mi (7002932000000000000932 km2) |
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| Rock Island County | 161 | Rock Island | 1831 | Jo Daviess County | Rock Island | 7005147546000000000147,546 | 7002427000000000000427 sq mi (70031106000000000001,106 km2) |
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| Saline County | 165 | Harrisburg | 1847 | Gallatin County | Salt springs within the county | 700424913000000000024,913 | 7002383000000000000383 sq mi (7002992000000000000992 km2) |
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| Sangamon County | 167 | Springfield | 1821 | Madison and Bond County | Sangamon River | 7005197465000000000197,465 | 7002868000000000000868 sq mi (70032248000000000002,248 km2) |
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| 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 | 70037544000000000007,544 | 7002437000000000000437 sq mi (70031132000000000001,132 km2) |
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| Scott County | 171 | Winchester | 1839 | Morgan County | Scott County, Kentucky, itself named after Charles Scott | 70035355000000000005,355 | 7002251000000000000251 sq mi (7002650000000000000650 km2) |
|
| Shelby County | 173 | Shelbyville | 1827 | Fayette County | Isaac Shelby (1750-1826), soldier in the American Revolutionary War and War of 1812, and first and fifth Governor of Kentucky | 700422363000000000022,363 | 7002759000000000000759 sq mi (70031966000000000001,966 km2) |
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| 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 | 7005270056000000000270,056 | 7002664000000000000664 sq mi (70031720000000000001,720 km2) |
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| 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" | 70035994000000000005,994 | 7002288000000000000288 sq mi (7002746000000000000746 km2) |
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| 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 | 700447711000000000047,711 | 7002564000000000000564 sq mi (70031461000000000001,461 km2) |
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| Tazewell County | 179 | Pekin | 1827 | Sangamon County | Littleton Waller Tazewell (1774-1860), United States Senator from (and later governor of) Virginia | 7005135394000000000135,394 | 7002649000000000000649 sq mi (70031681000000000001,681 km2) |
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| Union County | 181 | Jonesboro | 1818 | Johnson County | The federal union of the states | 700417808000000000017,808 | 7002416000000000000416 sq mi (70031077000000000001,077 km2) |
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| Vermilion County | 183 | Danville | 1826 | Edgar County | The Vermilion River | 700481625000000000081,625 | 7002899000000000000899 sq mi (70032328000000000002,328 km2) |
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| Wabash County | 185 | Mount Carmel | 1824 | Edwards County | The Wabash River | 700411947000000000011,947 | 7002224000000000000224 sq mi (7002580000000000000580 km2) |
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| Warren County | 187 | Monmouth | 1825 | Schuyler County | Joseph Warren (1741-1775), played a role in American Patriot movements, a prominent early fatality in the American Revolutionary War | 700417707000000000017,707 | 7002543000000000000543 sq mi (70031406000000000001,406 km2) |
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| Washington County | 189 | Nashville | 1818 | St. Clair County | George Washington (1732-1799), commander-in-chief of American forces in the American Revolutionary War and first President of the United States | 700414716000000000014,716 | 7002563000000000000563 sq mi (70031458000000000001,458 km2) |
|
| Wayne County | 191 | Fairfield | 1819 | Edwards County | Gen. "Mad" Anthony Wayne (1745-1796), major general in the United States Army in the American Revolutionary War and the Northwest Indian War | 700416760000000000016,760 | 7002714000000000000714 sq mi (70031849000000000001,849 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 | 700414665000000000014,665 | 7002495000000000000495 sq mi (70031282000000000001,282 km2) |
|
| Whiteside County | 195 | Morrison | 1836 | Jo Daviess and Henry County | Samuel Whiteside (1783-1868), state legislator and militia leader | 700458498000000000058,498 | 7002685000000000000685 sq mi (70031774000000000001,774 km2) |
|
| Will County | 197 | Joliet | 1836 | Cook and Iroquois County | Conrad Will (1779-1835), physician, local businessman and longtime member of the state legislature | 7005677560000000000677,560 | 7002837000000000000837 sq mi (70032168000000000002,168 km2) |
|
| Williamson County | 199 | Marion | 1839 | Franklin County | Hugh Williamson (1735-1819), delegate from North Carolina to the Philadelphia Convention | 700466357000000000066,357 | 7002424000000000000424 sq mi (70031098000000000001,098 km2) |
|
| Winnebago County | 201 | Rockford | 1836 | Jo Daviess | Winnebago Native Americans | 7005295266000000000295,266 | 7002514000000000000514 sq mi (70031331000000000001,331 km2) |
|
| Woodford County | 203 | Eureka | 1841 | Tazewell and McLean County | Gen. William Woodford (1734-1780), brigadier general in the American Revolutionary War who died while a British prisoner | 700438664000000000038,664 | 7002528000000000000528 sq mi (70031368000000000001,368 km2) |
Read more about this topic: List Of Counties In Illinois
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