List of counties in Illinois
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The US -American state of Illinois is in 102 counties divided. The official abbreviation for Illinois is IL and the FIPS code is 17 . The FIPS code of each individual counties therefore always begins with 17 , to which the three-digit number given in the table is appended. According to the United States Census Bureau , the population figures shown in the table are based on the 2010 census . |
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| county | FIPS code | County Seat | founding | origin | Origin of name | Residents 2010 |
surface | map |
|---|---|---|---|---|---|---|---|---|
| Adams | 001 | Quincy | 1825 | Pike County |
John Quincy Adams (1767–1848) sixth President of the United States |
67.103 | 2,193 km² |
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| Alexander | 003 | Cairo | 1819 | State of Missouri | William M. Alexander, settler and MP for the Illinois General Assembly | 8,238 | 605 km² |
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| Bond | 005 | Greenville | 1817 | Crawford County, Edwards County, and Madison County |
Shadrach Bond (1773–1832) first governor of Illinois |
17,768 | 973 km² |
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| Boone | 007 | Belvidere | 1837 | Winnebago County |
Daniel Boone (1734–1820) pioneer of the Wilderness Road in Kentucky |
54,165 | 720 km² |
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| Brown | 009 | Mount Sterling | 1839 | Schuyler County | Jacob Brown (1775–1828) officer in the American Revolutionary War |
6,937 | 782 km² |
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| Bureau | 011 | Princeton | 1837 | Putnam County | Pierre de Bureau French fur trader |
34,978 | 2,224 km² |
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| Calhoun | 013 | Hardin | 1825 | Pike County |
John C. Calhoun (1782–1850), seventh Vice President of the United States |
5,089 | 650 km² |
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| Carroll | 015 | Mount Carroll | 1839 | Jo Daviess County |
Charles Carroll (1737–1832) co-signer of the Declaration of Independence |
15,387 | 1,137 km² |
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| Cass | 017 | Virginia | 1837 | Morgan County |
Lewis Cass (1782–1866) second governor of the Territory of Michigan , fourteenth US Secretary of Defense |
13,642 | 962 km² |
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| Champaign | 019 | Urbana | 1833 | Vermilion County | Champaign County (Ohio) | 201.081 | 2,552 km² |
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| Christian | 021 | Taylorville | 1839 | Sangamon County | Christian County, Kentucky | 34,800 | 1,815 km² |
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| Clark | 023 | Marshall | 1819 | Crawford County | George Rogers Clark (1752-1818), senior officer in the Northwest Territory during the American struggle for independence | 16,335 | 1,284 km² |
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| Clay | 025 | Louisville | 1824 | Wayne, Lawrence, Fayette, and Crawford Counties | Henry Clay (1777-1852), negotiators Kentucky in the negotiations leading to the Missouri Compromise led | 13,815 | 1,201 km² |
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| Clinton | 027 | Carlyle | 1824 | Washington, Bond, and Fayette Counties | DeWitt Clinton (1769–1828), Governor of New York , responsible for building the Erie Canal | 37,762 | 1,214 km² |
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| Coles | 029 | Charleston | 1830 | Clark and Edgar Counties | Edward Coles (1786–1868), second governor of Illinois, responsible for the prohibition of slavery in Illinois | 53,873 | 1,301 km² |
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| cook | 031 | Chicago | 1831 | Putnam County | Daniel Pope Cook (1794–1827), politician and first Attorney General of Illinois | 5,194,675 | 2,421 km² |
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| Crawford | 033 | Robinson | 1816 | Edwards County | William Harris Crawford (1772–1834), ninth US Secretary of Defense , seventh US Treasury Secretary | 19,817 | 1,135 km² |
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| Cumberland | 035 | Toledo | 1843 | Coles County | disputed between: Cumberland Road , the town of Cumberland (Maryland) or the Cumberland River in Kentucky | 11,048 | 886 km² |
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| DeKalb | 037 | Sycamore | 1837 | Kane County | Johann von Kalb (1721–1780), German officer, fought in the Continental Army on the side of La Fayette in the American War of Independence | 105.160 | 1,623 km² |
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| DeWitt | 039 | Clinton | 1839 | Macon and McLean Counties | DeWitt Clinton (1769–1828), Governor of New York , responsible for building the Erie Canal | 16,561 | 1,018 km² |
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| Douglas | 041 | Tuscola | 1859 | Coles County | Stephen A. Douglas (1813–1861), well-known Democratic politician and adversary of Abraham Lincoln | 19,980 | 1,067 km² |
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| DuPage | 043 | Wheaton | 1839 | Cook County | DuPage River | 816.924 | 854 km² |
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| Edgar | 045 | Paris | 1823 | Clark County | John Edgar 1750–1832, Illinois delegate to the Northwest Territory Parliament | 18,576 | 1,596 km² |
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| Edwards | 047 | Albion | 1814 | Gallatin County and Madison County | Ninian Edwards (1775–1833), third governor of Illinois and sole governor of the Illinois Territory | 6,721 | 569 km² |
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| Effingham | 049 | Effingham | 1831 | Fayette and Crawford Counties | Earl of Effingham, British officer, retired from the army to join the American colonies | 34,242 | 1,225 km² |
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| Fayette | 051 | Vandalia | 1821 | Bond, Wayne, Clark, Jefferson, and Crawford Counties | Marie-Joseph Motier, Marquis de La Fayette (1757–1834), French officer in the American War of Independence and the French Revolution | 22,140 | 1,834 km² |
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| ford | 053 | Paxton | 1859 | Kankakee County | Thomas Ford (1800–1850), eighth governor of Illinois | 14,081 | 1,244 km² |
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| Franklin | 055 | Benton | 1818 | White County and Gallatin County | Benjamin Franklin (1706–1790), publisher, writer, statesman, scientist and inventor, one of the founding fathers of the USA | 39,561 | 1,055 km² |
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| Fulton | 057 | Lewistown | 1823 | Pike County | Robert Fulton (1765–1815), engineer, developed one of the first useful steamers | 37,069 | 2,216 km² |
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| Gallatin | 059 | Shawneetown | 1812 | Randolph County | Albert Gallatin (1761–1849), fourth and, at 13 years in office, the longest serving Secretary of the Treasury in the United States | 5,589 | 829 km² |
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| Greene | 061 | Carrollton | 1821 | Madison County | Nathanael Greene (1742–1786), Continental Army general in the American War of Independence | 13,886 | 1,390 km² |
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| Grundy | 063 | Morris | 1841 | LaSalle County | Felix Grundy (1777-1840), thirteenth United States Attorney General | 50,063 | 1,075 km² |
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| Hamilton | 065 | McLeansboro | 1821 | White County | Alexander Hamilton (1755–1804), first US Secretary of the Treasury | 8,457 | 1,114 km² |
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| Hancock | 067 | Carthage | 1825 | Adams County | John Hancock (1737–1793), First Governor of Massachusetts , President of the Continental Congress , Commander in Chief of the Continental Army | 19,104 | 2,034 km² |
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| Hardin | 069 | Elizabethtown | 1839 | Pope County | Hardin County, Kentucky | 4,320 | 457 km² |
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| Henderson | 071 | Oquawka | 1841 | Warren County | Henderson County, Kentucky | 7,331 | 970 km² |
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| Henry | 073 | Cambridge | 1825 | Adams County | Patrick Henry | 50,486 | 2,107 km² |
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| Iroquois | 075 | Watseka | 1833 | Vermilion County | Indian tribe of the Iroquois | 29,718 | 2,858 km² |
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| Jackson | 077 | Murphysboro | 1816 | Randolph County and Johnson County | Andrew Jackson | 60,218 | 1,506 km² |
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| Jasper | 079 | Newton | 1831 | Clay and Crawford County | William Jasper | 9,698 | 1,266 km² |
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| Jefferson | 081 | Mount Vernon | 1819 | Edwards and White Counties | Thomas Jefferson | 38,827 | 1,462 km² |
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| jersey | 083 | Jerseyville | 1839 | Greene County | The state of New Jersey , from which many of the county's settlers came | 22,985 | 945 km² |
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| Jo Daviess | 085 | Galena | 1827 | Henry, Mercer, and Putnam Counties | Joseph Hamilton Daviess | 22,678 | 1,539 km² |
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| Johnson | 087 | Vienna | 1812 | Randolph County | Richard mentor Johnson | 12,582 | 882 km² |
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| Kane | 089 | Geneva | 1836 | Cook County | Elias Kane | 515.269 | 1,332 km² |
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| Kankakee | 091 | Kankakee | 1853 | Iroquois and Will County | Kankakee River | 113,449 | 1,732 km² |
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| Kendall | 093 | Yorkville | 1841 | LaSalle and Kane County | Amos Kendall | 114,736 | 821 km² |
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| Knox | 095 | Galesburg | 1825 | Fulton County | General Henry Knox | 52,919 | 1,834 km² |
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| LaSalle County | 099 | Ottawa | 1831 | Putnam County | Robert Cavelier de La Salle | 113.924 | 2,905 km² |
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| Lake | 097 | Waukegan | 1839 | McHenry County | Lakes in the county | 703,462 | 1,146 km² |
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| Lawrence | 101 | Lawrenceville | 1821 | Crawford and Edwards Counties | James Lawrence | 16,833 | 952 km² |
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| lee | 103 | Dixon | 1839 | Ogle County | Henry Lee | 36,031 | 1,857 km² |
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| Livingston | 105 | Pontiac | 1837 | LaSalle and McLean County | Edward Livingston | 38,950 | 2,672 km² |
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| Logan | 107 | Lincoln | 1839 | Sangamon County | John A. Logan | 30.305 | 1,582 km² |
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| Macon | 115 | Decatur | 1829 | Shelby County | Nathaniel Macon | 110,768 | 1,486 km² |
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| Macoupin | 117 | Carlinville | 1829 | Greene County | the Indian word Macaupiana , which means something like white potato | 47,765 | 2,211 km² |
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| Madison | 119 | Edwardsville | 1812 | St. Clair Counties and Randolph Counties | James Madison (1751–1836), fourth President of the United States | 269.282 | 1,856 km² |
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| Marion | 121 | Salem | 1823 | Fayette and Jefferson County | Francis Marion | 39,437 | 1,465 km² |
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| Marshall | 123 | Lacon | 1839 | Putnam County | John Marshall (1755–1835), presiding judge of the US Supreme Court , fourth US Secretary of State | 12,640 | 988 km² |
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| mason | 125 | Havana | 1841 | Tazewell and Menard Counties | George Mason (1725–1792), Virginia politician | 14,666 | 1,380 km² |
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| Massac | 127 | Metropolis | 1843 | Pope and Johnson Counties | Fort Massac | 16,429 | 612 km² |
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| McDonough | 109 | Macomb | 1826 | Schuyler County | Thomas Macdonough | 32,612 | 1,509 km² |
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| McHenry | 111 | Woodstock | 1836 | Cook County | General William McHenry | 398.760 | 1,545 km² |
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| McLean | 113 | Bloomington | 1830 | Tazewell County | John McLean | 169,572 | 3,030 km² |
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| Menard | 129 | Petersburg | 1839 | Sangamon County | Pierre Menard | 12,705 | 804 km² |
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| Mercer | 131 | Aledo | 1825 | Schuyler County | Hugh Mercer | 16,434 | 1,436 km² |
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| Monroe | 133 | Waterloo | 1816 | Randolph Counties and St. Clair Counties | James Monroe (1758–1831), fifth President of the United States | 32,957 | 994 km² |
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| Montgomery | 135 | Hillsboro | 1821 | Bond and Madison County | Richard Montgomery (1738–1775), general in the American War of Independence | 30,104 | 1,802 km² |
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| Morgan | 137 | Jacksonville | 1823 | Sangamon County | Daniel Morgan | 25,547 | 1,456 km² |
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| Moultrie | 139 | Sullivan | 1843 | Shelby and Macon Counties | William Moultrie (1730–1805), Brigadier General in the American Revolutionary War , Governor of South Carolina | 14,846 | 859 km² |
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| Ogle | 141 | Oregon | 1836 | Jo Daviess County | Joseph Ogle | 53,497 | 1,943 km² |
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| Peoria | 143 | Peoria | 1825 | Fulton County | the Indian tribe of the Peoria | 186.494 | 1,586 km² |
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| Perry | 145 | Pinckneyville | 1827 | Randolph and Jackson County | Oliver Hazard Perry | 22,350 | 1,129 km² |
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| Piatt | 147 | Monticello | 1841 | DeWitt and Macon Counties | John Piatt | 16,729 | 1,126 km² |
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| pike | 149 | Pittsfield | 1821 | Madison, Bond, and Clark Counties | Zebulon Pike | 16,430 | 2,126 km² |
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| Pope | 151 | Golconda | 1816 | Gallatin and Johnson Counties | Nathaniel Pope | 4,470 | 949 km² |
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| Pulaski | 153 | Mound City | 1843 | Alexander and Johnson Counties | Kazimierz Pułaski | 6.161 | 514 km² |
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| Putnam | 155 | Hennepin | 1825 | Peoria County | Israel Putnam (1718–1790), general in the American War of Independence | 6.006 | 409 km² |
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| Randolph | 157 | Chester | 1795 | St. Clair County | Edmund Randolph (1753–1813) Governor of Virginia , Secretary of State and United States Attorney General | 33,476 | 1,481 km² |
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| Richland | 159 | Olney | 1841 | Clay and Lawrence Counties | Richland County (Ohio) | 16,233 | 922 km² |
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| Rock Island | 161 | Rock Island | 1831 | Jo Daviess County | Rock Island | 147,546 | 1,092 km² |
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| St. Clair | 163 | Belleville | 1790 | one of two original counties | Arthur St. Clair | 270.056 | 1,699 km² |
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| Saltworks | 165 | Harrisburg | 1847 | Gallatin County | Salt deposits in the county | 24,913 | 981 km² |
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| Sangamon | 167 | Springfield | 1821 | Madison and Bond Counties | Sangamon River | 197,465 | 2,223 km² |
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| Schuyler | 169 | Rushville | 1825 | Pike and Fulton Counties | Philip Schuyler | 1,544 | 1,120 km² |
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| Scott | 171 | Winchester | 1839 | Morgan Count | Scott family | 5,355 | 642 km² |
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| Shelby | 173 | Shelbyville | 1827 | Fayette County | Isaac Shelby | 22,363 | 1,942 km² |
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| Strong | 175 | Toulon | 1839 | Knox and Putnam Counties | John Stark | 5,994 | 737 km² |
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| Stephenson | 177 | Freeport | 1837 | Jo Daviess and Winnebago County | Benjamin Stephenson | 47,711 | 1,444 km² |
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| Tazewell | 179 | Pekin | 1827 | Sangamon County | Littleton Waller Tazewell | 135.394 | 1,661 km² |
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| union | 181 | Jonesboro | 1818 | Johnson County | Union (United States) | 17,808 | 1,065 km² |
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| Vermilion | 183 | Danville | 1826 | Clark and Edgar Counties | Vermilion River | 81,625 | 2,302 km² |
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| Wabash | 185 | Mount Carmel | 1824 | Edwards County | Wabash River | 11,847 | 522 km² |
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| Warren | 187 | Monmouth | 1825 | Schuyler County | Joseph Warren | 17,707 | 1,389 km² |
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| Washington | 189 | Nashville | 1818 | St. Clair County | George Washington | 14,716 | 1,440 km² |
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| Wayne | 191 | Fairfield | 1819 | Edwards County | General Anthony Wayne | 16,760 | 1,828 km² |
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| White | 193 | Carmi | 1815 | Gallatin County | Isaac White | 14,665 | 1,267 km² |
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| Whiteside | 195 | Morrison | 1836 | Jo Daviess and Henry County | Samuel Whiteside | 58,498 | 1,753 km² |
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| Want | 197 | Joliet | 1836 | Cook and Iroquois Counties | Conrad Will | 677.560 | 2,143 km² |
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| Williamson | 199 | Marion | 1839 | Franklin County | Hugh Williamson | 66,357 | 184 km² |
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| Winnebago | 201 | Rockford | 1836 | Jo Daviess County | Winnebago (people) | 295.266 | 1,315 km² |
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| Woodford | 203 | Eureka | 1841 | Tazewell and McLean Counties | William Woodford | 38,664 | 1,352 km² |
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Individual evidence
- ^ US Census Bureau - State & County QuickFacts
- ↑ US Census 2010
- ↑ US Census Bureau - State & County QuickFacts figures in square miles - converted to square kilometers.