Illinois County Map
About the map
Our Illinois county map displays its 102 counties. Illinois’ high number of counties ranks 7th highest in the United States. It falls behind just Texas, Georgia, Virginia, Kentucky, Missouri, and Kansas.
Cook County has the highest population in Illinois with over 5 million people. In fact, Cook County is the second-most populated county in the United States just behind Los Angeles County in California.
The largest county in size is McLean County at 1186.3 square miles in area. Then, this is followed by La Salle, Iroquois, and Livingston County. But the smallest county in Illinois is Putnam County just 172.3 square miles in area.
 Illinois County Map – National Map |
 Illinois State in Google Maps |
You are free to use our county map of Illinois for educational and commercial uses. Attribution is required. How to attribute?
Illinois county list
| FIPS Code | Name | Land (sq mi) | Water (sq mi) | Population (2024) |
|---|---|---|---|---|
| 17-001 | Adams County | 855.1 | 16.1 | 64,109 |
| 17-003 | Alexander County | 235.5 | 17.1 | 4,594 |
| 17-005 | Bond County | 380.3 | 2.5 | 16,576 |
| 17-007 | Boone County | 280.8 | 1.3 | 53,313 |
| 17-009 | Brown County | 305.7 | 1.6 | 6,307 |
| 17-011 | Bureau County | 869.1 | 4.5 | 32,486 |
| 17-013 | Calhoun County | 253.8 | 29.8 | 4,224 |
| 17-015 | Carroll County | 445.0 | 21.6 | 15,444 |
| 17-017 | Cass County | 375.7 | 7.9 | 12,713 |
| 17-019 | Champaign County | 996.1 | 2.4 | 212,374 |
| 17-021 | Christian County | 709.5 | 6.3 | 33,247 |
| 17-023 | Clark County | 501.4 | 3.4 | 15,076 |
| 17-025 | Clay County | 468.3 | 1.3 | 12,821 |
| 17-027 | Clinton County | 474.0 | 29.2 | 37,087 |
| 17-029 | Coles County | 508.3 | 1.8 | 46,423 |
| 17-031 | Cook County | 944.9 | 689.7 | 5,182,617 |
| 17-033 | Crawford County | 443.6 | 2.2 | 18,388 |
| 17-035 | Cumberland County | 345.9 | 1.0 | 10,305 |
| 17-037 | DeKalb County | 631.3 | 3.3 | 101,335 |
| 17-039 | De Witt County | 397.6 | 7.5 | 15,319 |
| 17-041 | Douglas County | 416.7 | 0.6 | 19,824 |
| 17-043 | DuPage County | 327.7 | 8.7 | 937,142 |
| 17-045 | Edgar County | 623.4 | 0.6 | 16,398 |
| 17-047 | Edwards County | 222.4 | 0.3 | 5,984 |
| 17-049 | Effingham County | 478.8 | 1.2 | 34,602 |
| 17-051 | Fayette County | 716.5 | 8.9 | 21,157 |
| 17-053 | Ford County | 485.6 | 0.6 | 13,451 |
| 17-055 | Franklin County | 408.9 | 22.5 | 37,033 |
| 17-057 | Fulton County | 865.7 | 17.0 | 32,510 |
| 17-059 | Gallatin County | 323.0 | 5.1 | 4,690 |
| 17-061 | Greene County | 543.0 | 3.3 | 11,417 |
| 17-063 | Grundy County | 418.1 | 12.4 | 53,835 |
| 17-065 | Hamilton County | 434.6 | 1.2 | 7,818 |
| 17-067 | Hancock County | 793.7 | 20.7 | 17,008 |
| 17-069 | Hardin County | 177.5 | 4.1 | 3,550 |
| 17-071 | Henderson County | 378.8 | 16.4 | 6,048 |
| 17-073 | Henry County | 823.0 | 2.6 | 48,177 |
| 17-075 | Iroquois County | 1117.4 | 1.6 | 26,067 |
| 17-077 | Jackson County | 584.1 | 18.3 | 53,199 |
| 17-079 | Jasper County | 494.6 | 3.6 | 9,092 |
| 17-081 | Jefferson County | 571.2 | 12.6 | 36,107 |
| 17-083 | Jersey County | 369.3 | 7.8 | 21,150 |
| 17-085 | Jo Daviess County | 600.9 | 17.7 | 21,528 |
| 17-087 | Johnson County | 343.9 | 4.9 | 13,320 |
| 17-089 | Kane County | 519.4 | 4.8 | 520,997 |
| 17-091 | Kankakee County | 676.5 | 4.8 | 106,410 |
| 17-093 | Kendall County | 320.3 | 2.0 | 143,171 |
| 17-095 | Knox County | 716.4 | 3.4 | 48,716 |
| 17-097 | Lake County | 443.9 | 924.4 | 718,604 |
| 17-099 | LaSalle County | 1135.2 | 13.0 | 108,390 |
| 17-101 | Lawrence County | 372.2 | 2.0 | 14,801 |
| 17-103 | Lee County | 724.8 | 4.1 | 33,544 |
| 17-105 | Livingston County | 1043.6 | 2.3 | 35,375 |
| 17-107 | Logan County | 618.1 | 0.9 | 27,518 |
| 17-109 | McDonough County | 589.4 | 0.8 | 26,662 |
| 17-111 | McHenry County | 603.4 | 7.7 | 315,959 |
| 17-113 | McLean County | 1183.2 | 3.0 | 172,069 |
| 17-115 | Macon County | 580.6 | 5.2 | 100,737 |
| 17-117 | Macoupin County | 862.9 | 4.7 | 43,895 |
| 17-119 | Madison County | 716.0 | 24.5 | 263,017 |
| 17-121 | Marion County | 572.4 | 3.6 | 36,437 |
| 17-123 | Marshall County | 386.8 | 11.7 | 11,552 |
| 17-125 | Mason County | 539.3 | 24.2 | 12,543 |
| 17-127 | Massac County | 237.2 | 4.6 | 13,627 |
| 17-129 | Menard County | 314.4 | 1.0 | 11,963 |
| 17-131 | Mercer County | 561.2 | 7.5 | 15,292 |
| 17-133 | Monroe County | 385.3 | 13.0 | 34,969 |
| 17-135 | Montgomery County | 703.6 | 6.0 | 27,615 |
| 17-137 | Morgan County | 568.8 | 3.5 | 32,618 |
| 17-139 | Moultrie County | 336.0 | 8.5 | 14,365 |
| 17-141 | Ogle County | 758.6 | 4.4 | 51,345 |
| 17-143 | Peoria County | 618.7 | 11.9 | 179,630 |
| 17-145 | Perry County | 441.8 | 5.2 | 20,272 |
| 17-147 | Piatt County | 439.2 | 0.3 | 16,628 |
| 17-149 | Pike County | 831.4 | 17.5 | 14,258 |
| 17-151 | Pope County | 368.8 | 5.5 | 3,703 |
| 17-153 | Pulaski County | 199.2 | 4.0 | 4,879 |
| 17-155 | Putnam County | 160.1 | 12.0 | 5,633 |
| 17-157 | Randolph County | 575.3 | 21.7 | 29,903 |
| 17-159 | Richland County | 360.1 | 1.9 | 15,362 |
| 17-161 | Rock Island County | 427.4 | 23.9 | 142,731 |
| 17-163 | St. Clair County | 657.7 | 16.2 | 251,149 |
| 17-165 | Saline County | 379.9 | 7.0 | 22,826 |
| 17-167 | Sangamon County | 868.3 | 8.7 | 194,345 |
| 17-169 | Schuyler County | 437.3 | 4.1 | 6,750 |
| 17-171 | Scott County | 250.9 | 1.9 | 4,880 |
| 17-173 | Shelby County | 758.5 | 9.6 | 20,542 |
| 17-175 | Stark County | 288.0 | 0.3 | 5,272 |
| 17-177 | Stephenson County | 564.6 | 0.5 | 43,088 |
| 17-179 | Tazewell County | 646.4 | 11.5 | 129,821 |
| 17-181 | Union County | 413.5 | 8.7 | 16,886 |
| 17-183 | Vermilion County | 898.3 | 2.9 | 71,106 |
| 17-185 | Wabash County | 223.3 | 4.2 | 10,979 |
| 17-187 | Warren County | 542.4 | 0.6 | 16,217 |
| 17-189 | Washington County | 562.6 | 1.3 | 13,535 |
| 17-191 | Wayne County | 713.9 | 1.6 | 15,928 |
| 17-193 | White County | 494.8 | 7.1 | 13,395 |
| 17-195 | Whiteside County | 684.2 | 12.3 | 54,657 |
| 17-197 | Will County | 835.9 | 13.3 | 708,583 |
| 17-199 | Williamson County | 420.2 | 24.2 | 67,064 |
| 17-201 | Winnebago County | 513.2 | 6.0 | 283,790 |
| 17-203 | Woodford County | 527.8 | 14.8 | 38,290 |
