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Illinois County Map shows the locational details of the 102 counties of the state.All the counties of Illinois state are administered by individual county seats. Some of the major counties of Illinois include Cass, Bond, Alexander, Clinton, Bureau, Clark, Brown, Clay, DuPage, Christian, Hardin
Jackson, Ford, Lake, Woodford, Will, Union, Wabash and Morgan, among many others.
Illinois also provides a list of all the 102 counties of the state. Some of the Illinois counties along with date of foundation are mentioned below:
- Calhoun county – 1825
- Bond County – 1817
- Cass county – 1837
- Edgar county – 1823
- Cook county – 1831
- Jasper county – 1831
- Lake county – 1839
- Menard county – 1839
- Pulasky county – 1843
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Apart from the above mentioned ones, the state of Illinois houses a number of other counties too. While Moultrie county of Illinois has a total population of 14, 287 (as per census 2000), Saline county is populated with 26, 7333 people. The total area covered by Adams county of Illinois state is 857 sq miles, whereas the Clark county spans over 502 sq miles of area. Providing a fair representation of the extensive range of counties the Illinois county map, in a way, facilitates the understanding of the geographical sub-division of the state.
NEIGHBOUR STATES: Wisconsin, Michigan, Iowa, Indiana, Missouri, Kentucky.
| County Name | Population | Area (sq. mi.) |
| Adams County | 68277 | 856.63 |
| Alexander County | 9590 | 236.38 |
| Bond County | 17633 | 380.2 |
| Boone County | 41786 | 281.27 |
| Brown County | 6950 | 305.65 |
| Bureau County | 35503 | 868.56 |
| Calhoun County | 5084 | 253.82 |
| Carroll County | 16674 | 444.21 |
| Cass County | 13695 | 375.9 |
| Champaign County | 179669 | 996.81 |
| Christian County | 35372 | 709.06 |
| Clark County | 17008 | 501.5 |
| Clay County | 14560 | 469.25 |
| Clinton County | 35535 | 474.23 |
| Coles County | 53196 | 508.29 |
| Cook County | 5376741 | 945.68 |
| Crawford County | 20452 | 443.53 |
| Cumberland County | 11253 | 346.02 |
| DeKalb County | 88969 | 634.16 |
| De Witt County | 16798 | 397.58 |
| Douglas County | 19922 | 416.86 |
| DuPage County | 904161 | 333.61 |
| Edgar County | 19704 | 623.55 |
| Edwards County | 6971 | 222.35 |
| Effingham County | 34264 | 478.7 |
| Fayette County | 21802 | 716.49 |
| Ford County | 14241 | 485.9 |
| Franklin County | 39018 | 412.08 |
| Fulton County | 38250 | 865.62 |
| Gallatin County | 6445 | 323.73 |
| Greene County | 14761 | 543.09 |
| Grundy County | 37535 | 419.9 |
| Hamilton County | 8621 | 435.16 |
| Hancock County | 20121 | 794.62 |
| Hardin County | 4800 | 178.33 |
| Henderson County | 8213 | 378.81 |
| Henry County | 51020 | 823.21 |
| Iroquois County | 31334 | 1116.43 |
| Jackson County | 59612 | 588.12 |
| Jasper County | 10117 | 494.4 |
| Jefferson County | 40045 | 570.96 |
| Jersey County | 21668 | 369.16 |
| Jo Daviess County | 22289 | 601.08 |
| Johnson County | 12878 | 344.63 |
| Kane County | 404119 | 520.44 |
| Kankakee County | 103833 | 676.75 |
| Kendall County | 54544 | 320.58 |
| Knox County | 55836 | 716.28 |
| Lake County | 644356 | 447.56 |
| La Salle County | 111509 | 1134.92 |
| Lawrence County | 15452 | 371.98 |
| County Name | Population | Area (sq. mi.) |
| Lee County | 36062 | 725.36 |
| Livingston County | 39678 | 1043.76 |
| Logan County | 31183 | 618.14 |
| McDonough County | 32913 | 589.27 |
| McHenry County | 260077 | 603.51 |
| McLean County | 150433 | 1183.53 |
| Macon County | 114706 | 580.52 |
| Macoupin County | 49019 | 863.57 |
| Madison County | 258941 | 725.02 |
| Marion County | 41691 | 572.26 |
| Marshall County | 13180 | 386.06 |
| Mason County | 16038 | 538.94 |
| Massac County | 15161 | 239.05 |
| Menard County | 12486 | 314.25 |
| Mercer County | 16957 | 561.02 |
| Monroe County | 27619 | 388.29 |
| Montgomery County | 30652 | 703.8 |
| Morgan County | 36616 | 568.76 |
| Moultrie County | 14287 | 335.6 |
| Ogle County | 51032 | 758.83 |
| Peoria County | 183433 | 619.52 |
| Perry County | 23094 | 440.96 |
| Piatt County | 16365 | 440.02 |
| Pike County | 17384 | 830.3 |
| Pope County | 4413 | 370.86 |
| Pulaski County | 7348 | 200.79 |
| Putnam County | 6086 | 159.8 |
| Randolph County | 33893 | 578.42 |
| Richland County | 16149 | 360.14 |
| Rock Island County | 149374 | 426.75 |
| St. Clair County | 256082 | 663.81 |
| Saline County | 26733 | 383.31 |
| Sangamon County | 188951 | 868.18 |
| Schuyler County | 7189 | 437.31 |
| Scott County | 5537 | 250.92 |
| Shelby County | 22893 | 758.51 |
| Stark County | 6332 | 287.94 |
| Stephenson County | 48979 | 564.18 |
| Tazewell County | 128485 | 648.86 |
| Union County | 18293 | 416.16 |
| Vermilion County | 83919 | 899.08 |
| Wabash County | 12937 | 223.47 |
| Warren County | 18735 | 542.52 |
| Washington County | 15148 | 562.61 |
| Wayne County | 17151 | 713.9 |
| White County | 15371 | 494.87 |
| Whiteside County | 60653 | 684.77 |
| Will County | 502266 | 836.94 |
| Williamson County | 61296 | 423.41 |
| Winnebago County | 278418 | 513.74 |
| Woodford County | 35469 | 527.95 |