Illinois Counties Map
Hover/click a county for data.
| Name | 2022 Population | Growth Since 2010 | Land Area (mi²) | Density (mi²) |
|---|---|---|---|---|
| Adams County | 64,871 | -3.41% | 855.21 | 75.85 |
| Alexander County | 4,921 | -40.03% | 235.52 | 20.89 |
| Bond County | 15,793 | -11.21% | 380.28 | 41.53 |
| Boone County | 53,736 | -0.67% | 280.74 | 191.41 |
| Brown County | 6,623 | -4.28% | 305.61 | 21.67 |
| Bureau County | 31,635 | -9.51% | 869.03 | 36.40 |
| Calhoun County | 4,469 | -12.30% | 253.82 | 17.61 |
| Carroll County | 14,278 | -7.25% | 445.06 | 32.08 |
| Cass County | 11,652 | -14.53% | 375.81 | 31.00 |
| Champaign County | 209,002 | 3.70% | 996.26 | 209.79 |
| Christian County | 31,257 | -10.09% | 709.38 | 44.06 |
| Clark County | 14,964 | -8.15% | 501.42 | 29.84 |
| Clay County | 12,938 | -6.42% | 468.33 | 27.63 |
| Clinton County | 37,157 | -1.81% | 474.08 | 78.38 |
| Coles County | 49,997 | -7.18% | 508.29 | 98.36 |
| Cook County | 5,085,050 | -2.19% | 945.33 | 5,379.11 |
| Crawford County | 18,178 | -8.20% | 443.63 | 40.98 |
| Cumberland County | 10,652 | -3.63% | 346.03 | 30.78 |
| DeKalb County | 106,541 | 1.33% | 631.35 | 168.75 |
| De Witt County | 15,170 | -8.56% | 397.55 | 38.16 |
| Douglas County | 19,486 | -2.49% | 416.66 | 46.77 |
| DuPage County | 909,943 | -0.88% | 327.51 | 2,778.33 |
| Edgar County | 16,564 | -10.50% | 623.37 | 26.57 |
| Edwards County | 6,419 | -4.68% | 222.42 | 28.86 |
| Effingham County | 33,489 | -2.15% | 478.78 | 69.95 |
| Fayette County | 21,240 | -4.03% | 716.49 | 29.64 |
| Ford County | 12,208 | -13.30% | 485.61 | 25.14 |
| Franklin County | 37,791 | -5.61% | 408.89 | 92.42 |
| Fulton County | 32,870 | -11.34% | 865.60 | 37.97 |
| Gallatin County | 4,177 | -25.05% | 323.07 | 12.93 |
| Greene County | 12,681 | -8.70% | 543.02 | 23.35 |
| Grundy County | 51,297 | 2.28% | 418.05 | 122.70 |
| Hamilton County | 8,020 | -5.04% | 434.67 | 18.45 |
| Hancock County | 17,348 | -9.13% | 793.73 | 21.86 |
| Hardin County | 3,605 | -16.53% | 177.53 | 20.31 |
| Henderson County | 6,493 | -11.58% | 378.87 | 17.14 |
| Henry County | 48,445 | -3.98% | 823.00 | 58.86 |
| Iroquois County | 26,004 | -12.45% | 1,117.29 | 23.27 |
| Jackson County | 55,133 | -8.68% | 584.07 | 94.39 |
| Jasper County | 9,568 | -1.61% | 494.52 | 19.35 |
| Jefferson County | 37,612 | -2.95% | 571.16 | 65.85 |
| Jersey County | 21,707 | -5.60% | 369.28 | 58.78 |
| Jo Daviess County | 20,947 | -7.51% | 600.91 | 34.86 |
| Johnson County | 12,399 | -1.63% | 343.92 | 36.05 |
| Kane County | 531,452 | 2.98% | 520.16 | 1,021.70 |
| Kankakee County | 109,589 | -3.38% | 676.57 | 161.98 |
| Kendall County | 132,809 | 15.11% | 320.29 | 414.66 |
| Knox County | 48,862 | -7.65% | 716.42 | 68.20 |
| Lake County | 687,379 | -2.38% | 443.66 | 1,549.33 |
| LaSalle County | 107,199 | -5.82% | 1,135.14 | 94.44 |
| Lawrence County | 15,273 | -9.84% | 372.18 | 41.04 |
| Lee County | 33,496 | -6.91% | 724.86 | 46.21 |
| Livingston County | 35,450 | -8.76% | 1,044.29 | 33.95 |
| Logan County | 27,736 | -8.41% | 618.06 | 44.88 |
| McDonough County | 28,776 | -11.82% | 589.41 | 48.82 |
| McHenry County | 306,343 | -0.90% | 603.22 | 507.85 |
| McLean County | 168,838 | -0.57% | 1,183.35 | 142.68 |
| Macon County | 102,524 | -7.46% | 580.69 | 176.56 |
| Macoupin County | 43,750 | -8.47% | 862.92 | 50.70 |
| Madison County | 259,786 | -3.54% | 715.73 | 362.96 |
| Marion County | 36,677 | -6.95% | 572.37 | 64.08 |
| Marshall County | 11,303 | -10.56% | 386.79 | 29.22 |
| Mason County | 12,837 | -12.38% | 539.24 | 23.81 |
| Massac County | 13,019 | -15.35% | 237.22 | 54.88 |
| Menard County | 11,917 | -6.14% | 314.44 | 37.90 |
| Mercer County | 15,095 | -8.01% | 561.20 | 26.90 |
| Monroe County | 35,429 | 7.38% | 385.02 | 92.02 |
| Montgomery County | 27,583 | -8.35% | 703.69 | 39.20 |
| Morgan County | 32,551 | -8.31% | 568.80 | 57.23 |
| Moultrie County | 14,060 | -5.38% | 335.94 | 41.85 |
| Ogle County | 50,229 | -5.96% | 758.58 | 66.21 |
| Peoria County | 174,856 | -6.10% | 619.19 | 282.39 |
| Perry County | 20,232 | -9.33% | 441.77 | 45.80 |
| Piatt County | 16,278 | -2.58% | 439.17 | 37.07 |
| Pike County | 15,459 | -5.70% | 831.40 | 18.59 |
| Pope County | 4,156 | -7.11% | 368.77 | 11.27 |
| Pulaski County | 5,038 | -17.76% | 199.19 | 25.29 |
| Putnam County | 5,748 | -4.39% | 160.16 | 35.89 |
| Randolph County | 30,597 | -8.57% | 575.50 | 53.17 |
| Richland County | 14,967 | -7.58% | 360.01 | 41.57 |
| Rock Island County | 139,653 | -5.39% | 427.46 | 326.70 |
| St. Clair County | 254,664 | -5.80% | 657.78 | 387.15 |
| Saline County | 22,597 | -9.26% | 379.83 | 59.49 |
| Sangamon County | 191,771 | -3.03% | 868.30 | 220.86 |
| Schuyler County | 6,462 | -14.24% | 437.27 | 14.78 |
| Scott County | 5,023 | -5.71% | 250.91 | 20.02 |
| Shelby County | 21,358 | -4.46% | 758.54 | 28.16 |
| Stark County | 5,114 | -14.32% | 288.08 | 17.75 |
| Stephenson County | 43,601 | -8.41% | 564.55 | 77.23 |
| Tazewell County | 129,862 | -4.15% | 649.08 | 200.07 |
| Union County | 16,116 | -9.11% | 413.46 | 38.98 |
| Vermilion County | 72,926 | -10.67% | 898.37 | 81.18 |
| Wabash County | 11,511 | -3.40% | 223.25 | 51.56 |
| Warren County | 16,400 | -7.41% | 542.41 | 30.24 |
| Washington County | 13,551 | -7.89% | 562.57 | 24.09 |
| Wayne County | 15,882 | -5.11% | 713.81 | 22.25 |
| White County | 13,294 | -8.93% | 494.77 | 26.87 |
| Whiteside County | 54,041 | -7.60% | 684.25 | 78.98 |
| Will County | 689,525 | 1.58% | 836.94 | 823.87 |
| Williamson County | 65,442 | -1.49% | 420.17 | 155.75 |
| Winnebago County | 279,398 | -5.32% | 513.42 | 544.19 |
| Woodford County | 38,255 | -1.05% | 527.81 | 72.48 |
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)