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Inventory of all Illinois Counties with their main and GIS websites where known. (Population Source: U.S. Census Bureau, Census 2000 Summary File 1)
| Adams | Adams County GIS | 68,277 | 856.63 | 21 | Adams County | | | Alexander | | 9,590 | 236.38 | 89 | | | | Bond | | 17,633 | 380.2 | 64 | | | | Boone | Boone County - My GIS | 41,786 | 281.27 | 32 | Boone County | | | Brown | | 6,950 | 305.65 | 95 | Brown County | | | Bureau | | 35,503 | 868.56 | 42 | Bureau County | | | Calhoun | | 5,084 | 253.82 | 100 | | | | Carroll | | 16,674 | 444.21 | 70 | Carroll County | | | Cass | | 13,695 | 375.9 | 82 | | | | Champaign | | 179,669 | 996.81 | 12 | Champaign County | | | Christian | | 35,372 | 709.06 | 44 | | | | Clark | | 17,008 | 501.5 | 67 | Clark County | | | Clay | Clay County - My GIS | 14,560 | 469.25 | 79 | | | | Clinton | | 35,535 | 474.23 | 41 | Clinton County | | | Coles | Coles County GIS | 53,196 | 508.29 | 27 | Coles County | | | Cook | Cook County Assessor GIS | 5,376,741 | 945.68 | 1 | Cook County | | | Crawford | | 20,452 | 443.53 | 58 | Crawford County | | | Cumberland | | 11,253 | 346.02 | 87 | | | | De Kalb | DeKalb County GIS | 16,798 | 397.58 | 69 | De Kalb County | | | De Witt | DeWitt Count - My GIS | 88,969 | 634.16 | 19 | DeWitt County | | | Douglas | | 19,922 | 416.86 | 60 | | | | Du Page | DuPage County GIS | 904,161 | 333.61 | 2 | Du Page County | | | Edgar | | 19,704 | 623.55 | 61 | Edgar County | | | Edwards | Edwards County - My GIS | 6,971 | 222.35 | 94 | | | | Effingham | Effingham County GIS | 34,264 | 478.7 | 45 | Effingham County | | | Fayette | | 21,802 | 716.49 | 56 | | | | Ford | | 14,241 | 485.9 | 81 | | | | Franklin | | 39,018 | 412.08 | 36 | | | | Fulton | | 38,250 | 865.62 | 37 | Fulton County | | | Gallatin | | 6,445 | 323.73 | 96 | | | | Greene | | 14,761 | 543.09 | 78 | | | | Grundy | | 37,535 | 419.9 | 38 | Grundy County | | | Hamilton | | 8,621 | 435.16 | 90 | | | | Hancock | | 20,121 | 794.62 | 59 | | | | Hardin | | 4,800 | 178.33 | 101 | Hardin County | | | Henderson | | 8,213 | 378.81 | 91 | | | | Henry | Henry County GIS | 51,020 | 823.21 | 29 | Henry County | | | Iroquois | | 31,334 | 1,116.43 | 48 | | | | Jackson | | 59,612 | 588.12 | 24 | Jackson County | | | Jasper | | 10,117 | 494.4 | 88 | | | | Jefferson | | 40,045 | 570.96 | 34 | | | | Jersey | | 21,668 | 369.16 | 57 | Jersey County | | | Jo Daviess | Jo Daviess GIS Dept | 22,289 | 601.08 | 55 | Jo Daviess County | | | Johnson | | 12,878 | 344.63 | 85 | | | | Kane | Kane County GIS | 404,119 | 520.44 | 5 | Kane County | | | Kankakee | Kankakee Planning GIS | 103,833 | 676.75 | 18 | Kankakee County | | | Kendall | Kendal County GIS | 54,544 | 320.58 | 26 | Kendall County | | | Knox | | 55,836 | 716.28 | 25 | Knox County | | | La Salle | | 644,356 | 1,134.92 | 17 | LaSalle County | | | Lake | Lake County GIS | 111,509 | 447.56 | 3 | Lake County | | | Lawrence | | 15,452 | 371.98 | 74 | Lawrence County | | | Lee | | 36,062 | 725.36 | 40 | Lee County | | | Livingston | | 39,678 | 1,043.76 | 35 | Livingston County | | | Logan | | 31,183 | 618.14 | 49 | Logan County | | | Macon | Macon GIS Dept | 114,706 | 580.52 | 16 | Macon County | | | Macoupin | | 49,019 | 863.57 | 30 | Macoupin County | | | Madison | Madison County Parcel Data | 258,941 | 725.02 | 8 | Madison County | | | Marion | Marion Sidwell Maps | 41,691 | 572.26 | 33 | | | | Marshall | | 13,180 | 386.06 | 83 | | | | Mason | | 16,038 | 538.94 | 73 | Mason County | | | Massac | | 15,161 | 239.05 | 76 | | | | McDonough | McDonough GIS Center | 32,913 | 589.27 | 47 | | | | McHenry | McHenry GIS Monuments | 260,077 | 603.51 | 7 | McHenry County | | | McLean | McLean GIS | 150,433 | 1,183.53 | 13 | McLean County | | | Menard | | 12,486 | 314.25 | 86 | Menard County | | | Mercer | | 16,957 | 561.02 | 68 | Mercer County | | | Monroe | | 27,619 | 388.29 | 51 | | | | Montgomery | | 30,652 | 703.8 | 50 | Montgomery County | | | Morgan | Morgan County GIS | 36,616 | 568.76 | 39 | Morgan County | | | Moultrie | | 14,287 | 335.6 | 80 | | | | Ogle | Ogle County GIS | 51,032 | 758.83 | 28 | Ogle County | | | Peoria | Peoria GIS | 183,433 | 619.52 | 11 | Peoria County | | | Perry | | 23,094 | 440.96 | 53 | Perry County | | | Piatt | | 16,365 | 440.02 | 71 | Piatt County | | | Pike | | 17,384 | 830.3 | 65 | Pike County | | | Pope | | 4,413 | 370.86 | 102 | | | | Pulaski | | 7,348 | 200.79 | 92 | Pulaski County | | | Putnam | | 6,086 | 159.8 | 98 | Putnam County | | | Randolph | Randolph County Maps & Plats | 33,893 | 578.42 | 46 | Randolph County | | | Richland | | 16,149 | 360.14 | 72 | | | | Rock Island | Rock Island GIS | 149,374 | 426.75 | 14 | Rock Island County | | | Saline | | 26,733 | 383.31 | 52 | | | | Sangamon | | 188,951 | 868.18 | 10 | Sangamon County | | | Schuyler | Schuler County Maps | 7,189 | 437.31 | 93 | Schuyler County | | | Scott | | 5,537 | 250.92 | 99 | | | | Shelby | | 22,893 | 758.51 | 54 | Shelby County | | | St. Clair | St. Clair GIS | 256,082 | 663.81 | 9 | St. Clair County | | | Stark | | 6,332 | 287.94 | 97 | Stark County | | | Stephenson | Stephenson County GIS | 48,979 | 564.18 | 31 | Stephenson County | | | Tazewell | Tri-County GIS | 128,485 | 648.86 | 15 | Tazewell County | | | Union | | 18,293 | 416.16 | 63 | Union County | | | Vermilion | Vermilion GIS | 83,919 | 899.08 | 20 | Vermilion County | | | Wabash | | 12,937 | 223.47 | 84 | | | | Warren | | 18,735 | 542.52 | 62 | Warren County | | | Washington | | 15,148 | 562.61 | 77 | Washington County | | | Wayne | Wayne County - My GIS | 17,151 | 713.9 | 66 | | | | White | | 15,371 | 494.87 | 75 | White County | | | Whiteside | Whiteside County GIS - Beacon Hosted | 60,653 | 684.77 | 23 | Whiteside County | | | Will | Will County GIS Dept | 502,266 | 836.94 | 4 | Will County | | | Williamson | | 61,296 | 423.41 | 22 | Williamson County | | | Winnebago | Winnebago GIS | 278,418 | 513.74 | 6 | Winnebago County | | | Woodford | Tri-County GIS | 35,469 | 527.95 | 43 | | |
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