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RANKING · 2010 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 2010

Illinois counties ranked by median age of residents (2010 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 41.6.

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Oldest by median age by state
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RANKPLACESTATEPOPMEDIAN AGEVS 2000
01Henderson County, ILIL5,98447.2+15%
02Jo Daviess County, ILIL21,59447.1+13%
03Pope County, ILIL3,67246.6+13%
04Carroll County, ILIL15,41946.5+14%
05Hardin County, ILIL3,58846.3+10%
06Putnam County, ILIL5,61945.2+14%
07White County, ILIL13,25045.2+8%
08Marshall County, ILIL11,47344.8+10%
09Calhoun County, ILIL4,30044.6+10%
10Hancock County, ILIL16,80344.6+11%
11Gallatin County, ILIL4,61644.4+9%
12Mason County, ILIL12,41144.0+11%
13Stark County, ILIL5,31943.8+10%
14Mercer County, ILIL15,22943.7+11%
15Schuyler County, ILIL6,65743.6+7%
16Shelby County, ILIL20,57643.5+11%
17Iroquois County, ILIL26,15043.4+10%
18Edgar County, ILIL16,32343.2+10%
19Pulaski County, ILIL4,82043.2+15%
20Hamilton County, ILIL7,85943.1+6%
21Stephenson County, ILIL43,22043.1+12%
22Union County, ILIL16,65642.9+6%
23Wayne County, ILIL15,88242.9+8%
24Edwards County, ILIL5,89842.7+5%
25Jasper County, ILIL9,03242.7+12%
26Scott County, ILIL4,86642.7+10%
27Menard County, ILIL11,86342.6+12%
28Piatt County, ILIL16,79142.6+8%
29Bureau County, ILIL32,51042.5+7%
30Pike County, ILIL14,23142.5+7%
31Ford County, ILIL13,21642.4+8%
32Clark County, ILIL15,11442.3+8%
33Washington County, ILIL13,56442.3+9%
34Clay County, ILIL12,79342.2+6%
35Johnson County, ILIL13,36342.2+15%
36Massac County, ILIL13,50242.1+6%
37Richland County, ILIL15,21942.1+8%
38Knox County, ILIL47,76742.0+7%
39Lee County, ILIL32,91442.0+11%
40Wabash County, ILIL10,90742.0+8%
41Fulton County, ILIL32,90141.9+7%
42Montgomery County, ILIL28,07641.9+10%
43Franklin County, ILIL36,91641.8+4%
44Henry County, ILIL48,09541.8+7%
45Whiteside County, ILIL54,12141.8+9%
46Crawford County, ILIL18,64841.7+8%
47Saline County, ILIL22,77241.7+5%
48De Witt County, ILIL15,11841.7+8%
49Macoupin County, ILIL43,74841.7+7%
50Christian County, ILIL33,44341.6+7%
51Greene County, ILIL11,31341.6+10%
52Marion County, ILIL36,38241.4+8%
53Alexander County, ILIL4,57041.1+8%
54Monroe County, ILIL34,84041.0+9%
55LaSalle County, ILIL107,77341.0+8%
56Randolph County, ILIL29,92141.0+9%
57Cumberland County, ILIL10,20840.9+10%
58Livingston County, ILIL35,05740.8+9%
59Morgan County, ILIL32,51540.8+8%
60Adams County, ILIL64,26740.7+6%
61Ogle County, ILIL51,39940.7+9%
62Jefferson County, ILIL36,14740.6+8%
63Jersey County, ILIL21,16040.5+9%
64Macon County, ILIL99,30040.3+6%
65Moultrie County, ILIL14,37140.3+4%
66Williamson County, ILIL67,22540.1+3%
67Rock Island County, ILIL141,86940.0+6%
68Fayette County, ILIL20,79039.9+6%
69Tazewell County, ILIL130,04939.8+4%
70Vermilion County, ILIL71,25939.8+5%
71Lawrence County, ILIL13,79039.7−3%
72Bond County, ILIL16,95939.7+8%
73Warren County, ILIL16,22239.6+5%
74Woodford County, ILIL38,11139.6+5%
75Logan County, ILIL27,18239.4+6%
76Perry County, ILIL20,16039.4+5%
77Clinton County, ILIL37,12839.3+7%
78Sangamon County, ILIL194,17039.2+5%
79Effingham County, ILIL34,51939.2+10%
80Cass County, ILIL12,46338.7+4%
81Douglas County, ILIL19,88038.7+3%
82Madison County, ILIL263,11038.6+5%
83Winnebago County, ILIL283,67438.3+7%
84DuPage County, ILIL934,29838.2+9%
85McHenry County, ILIL317,75138.0+11%
86Brown County, ILIL6,40137.3+6%
87St. Clair County, ILIL250,70836.9+5%
88Boone County, ILIL53,56836.8+7%
89Peoria County, ILIL178,55336.8+2%
90Kankakee County, ILIL105,52536.7+4%
91Lake County, ILIL719,33936.7+9%
92Grundy County, ILIL54,05236.1−1%
93Will County, ILIL712,25335.4+6%
94Cook County, ILIL5,194,62535.3+5%
95Kane County, ILIL525,75734.5+7%
96Kendall County, ILIL145,47032.9−4%
97McLean County, ILIL171,41932.1+5%
98Coles County, ILIL46,60731.6+3%
99DeKalb County, ILIL101,83529.3+3%
100Jackson County, ILIL52,50129.1+6%
101Champaign County, ILIL209,97228.9+1%
102McDonough County, ILIL25,91628.90%
SHOWING 1–102 OF 102

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS