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RANKING · 2000 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 2000

Illinois counties ranked by median age of residents (2000 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 38.1.

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Oldest by median age by state
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RANKPLACESTATEPOPMEDIAN AGEVS 1990
01Hardin County, ILIL3,58842.1+13%
02White County, ILIL13,25042.0+10%
03Jo Daviess County, ILIL21,59441.6+15%
04Pope County, ILIL3,67241.1+15%
05Henderson County, ILIL5,98441.0+9%
06Marshall County, ILIL11,47340.9+9%
07Schuyler County, ILIL6,65740.9+8%
08Carroll County, ILIL15,41940.8+9%
09Lawrence County, ILIL13,79040.8+8%
10Gallatin County, ILIL4,61640.7+2%
11Hamilton County, ILIL7,85940.6+3%
12Calhoun County, ILIL4,30040.5+6%
13Edwards County, ILIL5,89840.5+8%
14Franklin County, ILIL36,91640.3+6%
15Hancock County, ILIL16,80340.3+8%
16Union County, ILIL16,65640.3+6%
17Saline County, ILIL22,77239.9+4%
18Stark County, ILIL5,31939.9+5%
19Wayne County, ILIL15,88239.9+7%
20Pike County, ILIL14,23139.8+6%
21Clay County, ILIL12,79339.7+8%
22Bureau County, ILIL32,51039.6+9%
23Iroquois County, ILIL26,15039.6+7%
24Massac County, ILIL13,50239.6+4%
25Piatt County, ILIL16,79139.6+10%
26Putnam County, ILIL5,61939.6+10%
27Mason County, ILIL12,41139.5+8%
28Mercer County, ILIL15,22939.5+9%
29Ford County, ILIL13,21639.4+8%
30Knox County, ILIL47,76739.4+9%
31Edgar County, ILIL16,32339.3+5%
32Shelby County, ILIL20,57639.3+9%
33Clark County, ILIL15,11439.2+6%
34Fulton County, ILIL32,90139.2+6%
35Henry County, ILIL48,09539.1+9%
36Richland County, ILIL15,21939.1+10%
37Wabash County, ILIL10,90739.0+12%
38Christian County, ILIL33,44338.9+7%
39Macoupin County, ILIL43,74838.9+8%
40Scott County, ILIL4,86638.8+8%
41Washington County, ILIL13,56438.8+8%
42Williamson County, ILIL67,22538.8+7%
43Moultrie County, ILIL14,37138.7+5%
44Crawford County, ILIL18,64838.6+4%
45De Witt County, ILIL15,11838.5+9%
46Stephenson County, ILIL43,22038.5+10%
47Whiteside County, ILIL54,12138.5+11%
48Marion County, ILIL36,38238.4+9%
49Adams County, ILIL64,26738.3+7%
50Jasper County, ILIL9,03238.1+10%
51LaSalle County, ILIL107,77338.1+7%
52Montgomery County, ILIL28,07638.1+8%
53Tazewell County, ILIL130,04938.1+10%
54Alexander County, ILIL4,57038.0+9%
55Macon County, ILIL99,30038.0+9%
56Menard County, ILIL11,86338.0+7%
57Vermilion County, ILIL71,25938.0+7%
58Greene County, ILIL11,31337.9+5%
59Lee County, ILIL32,91437.9+10%
60Rock Island County, ILIL141,86937.8+8%
61Morgan County, ILIL32,51537.8+10%
62Warren County, ILIL16,22237.8+8%
63Woodford County, ILIL38,11137.8+11%
64Pulaski County, ILIL4,82037.7+8%
65Jefferson County, ILIL36,14737.6+8%
66Perry County, ILIL20,16037.6+6%
67Randolph County, ILIL29,92137.6+11%
68Monroe County, ILIL34,84037.5+10%
69Fayette County, ILIL20,79037.5+6%
70Douglas County, ILIL19,88037.4+8%
71Sangamon County, ILIL194,17037.3+9%
72Jersey County, ILIL21,16037.3+12%
73Livingston County, ILIL35,05737.3+9%
74Cass County, ILIL12,46337.2+4%
75Cumberland County, ILIL10,20837.2+10%
76Ogle County, ILIL51,39937.2+10%
77Logan County, ILIL27,18237.0+7%
78Madison County, ILIL263,11036.9+9%
79Bond County, ILIL16,95936.8+5%
80Johnson County, ILIL13,36336.7+3%
81Clinton County, ILIL37,12836.6+11%
82Grundy County, ILIL54,05236.3+9%
83Peoria County, ILIL178,55336.0+6%
84Winnebago County, ILIL283,67435.9+7%
85Effingham County, ILIL34,51935.7+12%
86St. Clair County, ILIL250,70835.3+10%
87DuPage County, ILIL934,29835.2+9%
88Brown County, ILIL6,40135.2+5%
89Kankakee County, ILIL105,52535.2+7%
90Boone County, ILIL53,56834.5+4%
91McHenry County, ILIL317,75134.2+6%
92Kendall County, ILIL145,47034.1+6%
93Lake County, ILIL719,33933.8+7%
94Cook County, ILIL5,194,62533.6+3%
95Will County, ILIL712,25333.3+7%
96Kane County, ILIL525,75732.2+4%
97Coles County, ILIL46,60730.8+3%
98McLean County, ILIL171,41930.5+5%
99McDonough County, ILIL25,91629.0+6%
100Champaign County, ILIL209,97228.6+3%
101DeKalb County, ILIL101,83528.4+4%
102Jackson County, ILIL52,50127.5+4%
SHOWING 1–102 OF 102

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