Northern Illinois Data by Subject
Demographic Characteristics - Population by Age.


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Mercer County, Illinois

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  State of Illinois

Population by Age
1980
1990
2000
Change
1980-1990
Change
1990-2000
 
Number
Percent
Number
Percent
Number
Percent
Number
Percent
Number
Percent
Total Population 19,286 100.0 17,290 100.0 16,957 100.0 -1,996 -10.3 -333 -1.9
 Under 5 yrs. 1,430 7.4 1,137 6.6 960 5.7 -293 -20.5 -177 -15.6
 5 to 9 yrs. 1,623 8.4 1,422 8.2 1,134 6.7 -201 -12.4 -288 -20.3
 10 to 14 yrs. 1,670 8.7 1,250 7.2 1,298 7.7 -420 -25.1 48 3.8
 15 to 19 yrs. 1,828 9.5 1,263 7.3 1,270 7.5 -565 -30.9 7 0.6
 20 to 24 yrs. 1,352 7.0 861 5.0 779 4.6 -491 -36.3 -82 -9.5
 25 to 29 yrs. 1,371 7.1 1,128 6.5 857 5.1 -243 -17.7 -271 -24.0
 30 to 34 yrs. 1,424 7.4 1,315 7.6 1,001 5.9 -109 -7.7 -314 -23.9
 35 to 44 yrs. 2,388 12.4 2,331 13.5 2,646 15.6 -57 -2.4 315 13.5
 45 to 54 yrs. 1,831 9.5 2,176 12.6 2,460 14.5 345 18.8 284 13.1
 55 to 59 yrs. 927 4.8 908 5.3 1,029 6.1 -19 -2.0 121 13.3
 60 to 64 yrs. 967 5.0 706 4.1 821 4.8 -261 -27.0 115 16.3
 65 to 74 yrs. 1,434 7.4 1,517 8.8 1,332 7.9 83 5.8 -185 -12.2
 75 to 84 yrs. 779 4.0 960 5.6 998 5.9 181 23.2 38 4.0
 85 yrs & over 262 1.4 316 1.8 372 2.2 54 20.6 56 17.7
  Median Age 31.3 36.2 39.5

SOURCE: U.S. Census Bureau, 2000.

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