| County/Place | Population Percentage Change Latest to Earliest | Percentage Change in total owner occupied | Percentage Change in below 35 years age group | Percentage Change in 35 to 44 years age group | Percentage Change in 45 to 59 years age group | Percentage Change in above 60 years age group |
|---|---|---|---|---|---|---|
| United States | 4.99 | -0.81 | -18.96 | -17.74 | -2.61 | 17.58 |
| Illinois | 0.69 | -3.49 | -23.86 | -19.22 | -3.09 | 14.87 |
| Adams County | 0.28 | -5.68 | -1.3 | -17.89 | -6.13 | -1.36 |
| Alexander County | -10.78 | -31.15 | -17.5 | -45.11 | -37.95 | -23.78 |
| Bond County | -4.73 | -7.84 | -33.6 | -16.44 | -18.85 | 15.27 |
| Boone County | 2.77 | 8.42 | -15.75 | -21.81 | 25.58 | 26.1 |
| Brown County | 4.03 | 2.72 | -21.92 | 12.3 | 1.11 | 10.83 |
| Bureau County | -1.95 | -4.22 | -17.11 | -20.33 | -9.63 | 11.72 |
| Calhoun County | -1.52 | 3.41 | 25 | -42.51 | 11.4 | 16.27 |
| Carroll County | -6 | -4.51 | 7.74 | -33.81 | -9.73 | 8.22 |
| Cass County | -2.36 | 1.64 | 7.11 | -22.18 | -5.14 | 20.85 |
| Champaign County | 7.09 | 4.14 | -10.88 | -5.66 | -2.25 | 23.67 |
| Christian County | -0.99 | -4.28 | -12.57 | -16.27 | -2.83 | 2.34 |
| Clark County | -3.69 | -7.88 | -17.55 | -27.54 | -0.94 | -1.4 |
| Clay County | -1.07 | -2.16 | 15.54 | -12.87 | -10.68 | 3.66 |
| Clinton County | 4.68 | 4.57 | -12.74 | -24.94 | 9.78 | 23.55 |
| Coles County | 1.71 | 4.75 | -17.36 | 0.6 | -5.19 | 25.07 |
| Cook County | -0.39 | -6.1 | -29.34 | -18.8 | -4.57 | 9.91 |
| Crawford County | -0.02 | -2.38 | 2.98 | -21.06 | -6.46 | 8.3 |
| Cumberland County | 1.31 | 0.84 | 5.46 | -24.06 | 6.18 | 7.1 |
| DeKalb County | 0.06 | -4.08 | -15.85 | -32.09 | -2.33 | 23.41 |
| De Witt County | 0.6 | 0.88 | -15.14 | -10.04 | 4.97 | 9.3 |
| Douglas County | 2.01 | -4.07 | 2.78 | -25.43 | -13.49 | 14.77 |
| DuPage County | 0.53 | -3.95 | -23.4 | -26.1 | -5.49 | 24.63 |
| Edgar County | -4.04 | -3.31 | -8.9 | 2.65 | -19.53 | 11.06 |
| Edwards County | 1.88 | 4.26 | -6.03 | 0.28 | -2.75 | 14.99 |
| Effingham County | 0.01 | -0.29 | -9.25 | -13.12 | -4.35 | 13.23 |
| Fayette County | 5.33 | -5.33 | -21.3 | -22.69 | 0 | 4.78 |
| Ford County | -0.95 | -3.95 | -22.45 | -14.61 | -16.01 | 19.83 |
| Franklin County | 1 | -4.09 | -14.56 | -19.89 | -3.86 | 5.31 |
| Fulton County | -1.46 | -5.53 | -23.26 | -15.78 | -0.38 | 0.32 |
| Gallatin County | -9.05 | -14.74 | -52.41 | -29.48 | -18.56 | 11.99 |
| Greene County | -1.91 | -6.88 | -30.22 | -19.46 | 0.36 | 0.17 |
| Grundy County | 8.09 | 7.19 | -9.02 | -11.72 | 8.37 | 29.9 |
| Hamilton County | 1.66 | -3.9 | 39.21 | -11.52 | -18.65 | -2.56 |
| Hancock County | 0.1 | -1.94 | 4.48 | -10.1 | -17.18 | 11.56 |
| Hardin County | -5.41 | -7.02 | -43.43 | -17.17 | -14.32 | 13.22 |
| Henderson County | -6.73 | -4.77 | -26.25 | -24.61 | -2.46 | 5.29 |
| Henry County | 0.73 | 1.1 | -0.44 | -1.47 | -4.21 | 7.21 |
| Iroquois County | -3.21 | -0.1 | -24.09 | -27.06 | -11.24 | 34.37 |
| Jackson County | 1.72 | -2.07 | -14.81 | -4.2 | -11.36 | 10 |
| Jasper County | -0.1 | -3.4 | -15.82 | -9.9 | -5.23 | 6.75 |
| Jefferson County | -3.71 | -5.03 | -20.72 | -14.31 | -5.95 | 4.92 |
| Jersey County | 0.95 | 5.19 | -17.98 | 0.17 | -7.75 | 30.91 |
| Jo Daviess County | 1.07 | -5.81 | -19 | -14.13 | -15.85 | 7.52 |
| Johnson County | -6.04 | 2.77 | -29.31 | -32.19 | 4.66 | 27.6 |
| Kane County | 6.17 | 0.98 | -33.43 | -17.05 | 2.31 | 38.28 |
| Kankakee County | 0.88 | 0.39 | -16.16 | -17.78 | -0.7 | 18.86 |
| Kendall County | 27.6 | 21.67 | -1.74 | 28.65 | 17.54 | 42.22 |
| Knox County | 0.07 | -6.03 | -17.24 | -26.31 | -10.61 | 7.72 |
| Lake County | 0.05 | -3.17 | -25.17 | -25.55 | -1.24 | 24.39 |
| LaSalle County | 0.25 | -4.61 | -13.26 | -24.28 | -5.15 | 8.68 |
| Lawrence County | 0.69 | -17.29 | -36.99 | -25.19 | -32.69 | 3.17 |
| Lee County | 0.09 | -1.19 | -21.29 | -23.54 | 4.36 | 12.54 |
| Livingston County | -0.73 | -4.44 | -17.34 | -26.94 | -11.19 | 17.85 |
| Logan County | 0.05 | -10.69 | -34.61 | -42.22 | -15.05 | 17.44 |
| McDonough County | -2.73 | -1.76 | -8.39 | -12.83 | -2.68 | 5.15 |
| McHenry County | -1.79 | -2.72 | -20.5 | -29.39 | 5.24 | 22.2 |
| McLean County | 5.76 | 1.74 | -10.59 | -13.35 | 3.66 | 17.81 |
| Macon County | 0.39 | -6.16 | -30.03 | -16.65 | -14.05 | 14.89 |
| Macoupin County | -2.71 | -6.17 | -25.53 | -23.62 | -8.27 | 13.04 |
| Madison County | 0.18 | -4.69 | -20.94 | -19.9 | -4.21 | 10.47 |
| Marion County | -2.08 | -2.63 | -9.07 | -6.09 | -2.47 | 0.53 |
| Marshall County | -5.13 | -4.53 | -0.85 | -32.11 | -10.37 | 11.02 |
| Mason County | -6.3 | -10.19 | -32.59 | -40.02 | -1.6 | 3.41 |
| Massac County | -0.43 | -14.7 | -52.71 | -18.32 | -4.37 | -6.29 |
| Menard County | 1.21 | -3.08 | -28.36 | -11.23 | -12.61 | 22 |
| Mercer County | -2.03 | -5.24 | -30.79 | -7.08 | -13.2 | 10.93 |
| Monroe County | 3.65 | 6.7 | 2.43 | -16.35 | 6.82 | 26.57 |
| Montgomery County | -1.46 | -3.9 | 14.93 | -46.27 | -7.81 | 15.26 |
| Morgan County | -0.48 | -2.66 | -10.17 | -15.95 | -3.26 | 5.62 |
| Moultrie County | 4.06 | 1.73 | 1.7 | -17.99 | 4.07 | 9.77 |
| Ogle County | -4.46 | 2.11 | -11.06 | -21.58 | -0.13 | 22.38 |
| Peoria County | 1.98 | -3.61 | -20.35 | -13.44 | -7.04 | 11.71 |
| Perry County | -3.25 | -10.88 | -48.25 | -1.21 | -6.06 | -5.46 |
| Piatt County | -0.02 | 5.17 | 5.16 | -19.36 | 0.89 | 22.72 |
| Pike County | -2.06 | -2.96 | 23.26 | -11.91 | -4.1 | -4.42 |
| Pope County | 6.39 | -0.82 | 62.71 | -45.99 | -18.58 | 22.45 |
| Pulaski County | -8.69 | -10.52 | -17.17 | -53.67 | -6.76 | 6.36 |
| Putnam County | -2.59 | -1.7 | 1.1 | -9.72 | -5.45 | 4.02 |
| Randolph County | 0.66 | -2.32 | -27.19 | -13.58 | -2.57 | 12.48 |
| Richland County | 3.24 | -12.63 | -50.73 | -9.58 | -13.88 | 2.45 |
| Rock Island County | 0.33 | -2.62 | -12.4 | -9.64 | -14.28 | 14.55 |
| St. Clair County | 2.21 | -3.45 | -25.88 | -18.83 | -3.14 | 13.63 |
| Saline County | -4.33 | -14.29 | -21.83 | -40.1 | -18.6 | 2.25 |
| Sangamon County | 2.56 | -1.17 | -21.42 | -13.52 | -4.49 | 18 |
| Schuyler County | 5.7 | 2.04 | 3.04 | -16.25 | 5.83 | 9.23 |
| Scott County | -0.76 | -8.38 | -26.07 | -29.96 | 10.78 | -7.91 |
| Shelby County | 1.19 | -0.36 | -1.95 | -17.82 | -3.32 | 10.46 |
| Stark County | -3.57 | -0.56 | 7.45 | -13.45 | -11.66 | 9.51 |
| Stephenson County | -0.42 | -5.4 | -17.82 | -35.03 | -8.78 | 13.41 |
| Tazewell County | 3.75 | 0.25 | -5.43 | -8.46 | -7.41 | 14.76 |
| Union County | -2.92 | -4.25 | -33.41 | -17.87 | 3.23 | 8.28 |
| Vermilion County | -0.69 | -6.42 | -27.47 | -16.73 | -4.24 | 2.55 |
| Wabash County | -4.48 | -11.73 | -8.96 | -31.43 | -22.58 | 7.92 |
| Warren County | 0.85 | 1.71 | -9.28 | -6.34 | 1.33 | 8.08 |
| Washington County | -1.82 | -10.23 | -32.97 | -29.69 | -5.6 | 4.79 |
| Wayne County | 0.3 | 1.62 | -4.41 | -8.7 | 2.73 | 6.95 |
| White County | -2.09 | -12.99 | -28.91 | -42 | -12.15 | 6.41 |
| Whiteside County | -2.6 | -0.75 | 1.6 | -17.34 | -6.72 | 10.46 |
| Will County | 2.96 | 0.79 | -31.48 | -18.1 | 10.15 | 32.3 |
| Williamson County | 4.53 | 1.22 | -10.32 | -11.17 | -3.99 | 16.07 |
| Winnebago County | -1.81 | -4.27 | -28.53 | -21.15 | -6.44 | 17.98 |
| Woodford County | 3.05 | 0.16 | -20.95 | -15.13 | 1.13 | 17.09 |
Source: Gavop.com and Census Bureau