Census Charts Index > Illinois

Illinois Census Data: Age & Sex by County

Age and sex distributions for Illinois counties are shown in this easy-to-read table and chart combination.

Scroll down for information about Reading the chart.

Source: U.S. Census Bureau 2000 Census.


Illinois Census Data: Age & Sex by County
LocationPopulationAge %Median
Age
Males per 100 FemalesLocation
under 1818-2425-4445-6465 & overAll Ages18 & Over
United States

281,421,906

25.79.630.222.012.4

35.3

96.393.4United States
Illinois

12,419,293

26.19.830.621.512.1

34.7

95.992.9Illinois
Adams Co.68,27724.98.826.422.417.6

38.3

92.789.7Adams Co.
Alexander Co.9,59025.87.726.622.916.9

38.0

98.696.1Alexander Co.
Bond Co.17,63321.911.629.422.414.7

36.8

116.3119.6Bond Co.
Boone Co.41,78629.87.729.922.010.7

34.5

100.297.6Boone Co.
Brown Co.6,95017.812.637.519.412.7

35.2

174.7194.5Brown Co.
Bureau Co.35,50324.77.426.223.817.7

39.6

94.491.5Bureau Co.
Calhoun Co.5,08422.97.625.924.419.2

40.5

100.8100.4Calhoun Co.
Carroll Co.16,67424.36.625.424.519.3

40.8

97.895.1Carroll Co.
Cass Co.13,69525.48.427.822.715.7

37.2

98.794.7Cass Co.
Champaign Co.179,66921.023.128.218.09.7

28.6

101.199.7Champaign Co.
Christian Co.35,37224.17.628.123.017.2

38.9

99.697.3Christian Co.
Clark Co.17,00824.97.426.623.118.0

39.2

94.790.8Clark Co.
Clay Co.14,56023.98.025.923.019.2

39.7

92.389.1Clay Co.
Clinton Co.35,53524.99.330.221.314.4

36.6

106.6106.8Clinton Co.
Coles Co.53,19619.723.523.819.713.3

30.8

91.388.1Coles Co.
Cook Co.5,376,74126.09.931.720.711.7

33.6

93.990.5Cook Co.
Crawford Co.20,45222.88.628.923.016.6

38.6

107.3106.5Crawford Co.
Cumberland Co.11,25326.48.027.522.215.8

37.2

95.993.3Cumberland Co.
DeKalb Co.88,96923.122.027.617.49.8

28.4

98.296.5DeKalb Co.
De Witt Co.16,79824.67.828.323.515.9

38.5

95.693.5De Witt Co.
Douglas Co.19,92227.08.026.822.116.0

37.4

94.492.0Douglas Co.
DuPage Co.904,16126.78.232.422.89.8

35.2

97.294.2DuPage Co.
Edgar Co.19,70423.98.327.023.217.7

39.3

95.193.4Edgar Co.
Edwards Co.6,97123.18.026.124.318.5

40.5

93.891.5Edwards Co.
Effingham Co.34,26428.68.228.221.113.9

35.7

98.293.5Effingham Co.
Fayette Co.21,80223.89.029.321.915.9

37.5

108.6111.5Fayette Co.
Ford Co.14,24125.86.926.421.519.4

39.4

91.987.0Ford Co.
Franklin Co.39,01823.07.926.224.318.7

40.3

91.989.0Franklin Co.
Fulton Co.38,25022.08.728.023.018.3

39.2

105.3104.5Fulton Co.
Gallatin Co.6,44522.28.225.426.018.2

40.7

94.190.0Gallatin Co.
LocationPopulationAge %Median
Age
Males per 100 FemalesLocation
under 1818-2425-4445-6465 & overAll Ages18 & Over
United States

281,421,906

25.79.630.222.012.4

35.3

96.393.4United States
Illinois

12,419,293

26.19.830.621.512.1

34.7

95.992.9Illinois
Greene Co.14,76125.58.826.421.817.5

37.9

96.694.0Greene Co.
Grundy Co.37,53526.68.330.222.512.3

36.3

98.997.4Grundy Co.
Hamilton Co.8,62124.07.924.724.219.2

40.6

93.391.0Hamilton Co.
Hancock Co.20,12124.67.125.524.518.3

40.3

94.290.2Hancock Co.
Hardin Co.4,80020.47.826.226.918.6

42.1

100.6100.5Hardin Co.
Henderson Co.8,21323.17.526.226.516.7

41.0

97.797.7Henderson Co.
Henry Co.51,02025.37.726.424.316.3

39.1

96.192.5Henry Co.
Iroquois Co.31,33425.47.125.723.618.1

39.6

96.291.8Iroquois Co.
Jackson Co.59,61219.326.025.917.911.0

27.5

104.3102.9Jackson Co.
Jasper Co.10,11725.98.626.522.616.5

38.1

97.695.3Jasper Co.
Jefferson Co.40,04524.28.828.423.315.3

37.6

104.1104.1Jefferson Co.
Jersey Co.21,66825.49.927.622.814.4

37.3

95.692.4Jersey Co.
Jo Daviess Co.22,28923.26.725.326.817.9

41.6

100.597.0Jo Daviess Co.
Johnson Co.12,87818.311.434.022.713.6

36.7

149.0160.2Johnson Co.
Kane Co.404,11930.39.131.920.48.4

32.2

101.298.8Kane Co.
Kankakee Co.103,83327.19.728.222.013.1

35.2

95.691.9Kankakee Co.
Kendall Co.54,54429.57.532.422.18.5

34.1

98.795.9Kendall Co.
Knox Co.55,83622.09.826.524.117.5

39.4

99.296.6Knox Co.
Lake Co.644,35629.48.931.621.68.5

33.8

101.299.3Lake Co.
La Salle Co.111,50925.28.128.022.316.4

38.1

97.996.4La Salle Co.
Lawrence Co.15,45222.77.626.223.420.1

40.8

91.087.8Lawrence Co.
Lee Co.36,06224.27.830.323.114.7

37.9

105.2104.8Lee Co.
Livingston Co.39,67825.08.229.621.915.3

37.3

97.695.5Livingston Co.
Logan Co.31,18321.911.629.721.815.0

37.0

99.998.7Logan Co.
McDonough Co.32,91317.727.621.519.114.1

29.0

95.393.8McDonough Co.
McHenry Co.260,07730.27.133.521.38.0

34.2

100.798.0McHenry Co.
McLean Co.150,43323.518.629.219.09.7

30.5

93.690.4McLean Co.
Macon Co.114,70624.69.826.424.015.2

38.0

91.287.5Macon Co.
Macoupin Co.49,01924.68.326.722.917.5

38.9

94.990.9Macoupin Co.
Madison Co.258,94124.99.428.922.514.3

36.9

93.088.9Madison Co.
LocationPopulationAge %Median
Age
Males per 100 FemalesLocation
under 1818-2425-4445-6465 & overAll Ages18 & Over
United States

281,421,906

25.79.630.222.012.4

35.3

96.393.4United States
Illinois

12,419,293

26.19.830.621.512.1

34.7

95.992.9Illinois
Marion Co.41,69125.58.126.623.316.6

38.4

93.088.5Marion Co.
Marshall Co.13,18023.57.225.624.918.8

40.9

96.094.7Marshall Co.
Mason Co.16,03824.47.726.324.217.3

39.5

96.193.1Mason Co.
Massac Co.15,16123.07.927.523.817.8

39.6

91.787.9Massac Co.
Menard Co.12,48626.56.828.924.613.2

38.0

96.292.0Menard Co.
Mercer Co.16,95724.87.326.625.415.9

39.5

96.994.2Mercer Co.
Monroe Co.27,61926.47.430.622.213.4

37.5

96.893.6Monroe Co.
Montgomery Co.30,65223.78.329.321.717.0

38.1

106.4106.4Montgomery Co.
Morgan Co.36,61622.811.127.223.315.6

37.8

98.697.0Morgan Co.
Moultrie Co.14,28725.77.926.022.817.7

38.7

93.089.3Moultrie Co.
Ogle Co.51,03227.57.228.823.113.4

37.2

98.496.0Ogle Co.
Peoria Co.183,43325.110.427.622.814.2

36.0

92.688.6Peoria Co.
Perry Co.23,09422.010.329.222.516.0

37.6

113.1114.8Perry Co.
Piatt Co.16,36525.16.827.625.015.5

39.6

95.491.9Piatt Co.
Pike Co.17,38424.17.825.723.219.2

39.8

98.195.3Pike Co.
Pope Co.4,41321.510.223.826.717.7

41.1

102.6101.2Pope Co.
Pulaski Co.7,34827.28.325.321.717.4

37.7

91.889.3Pulaski Co.
Putnam Co.6,08625.17.026.725.315.9

39.6

97.796.2Putnam Co.
Randolph Co.33,89322.19.630.422.315.6

37.6

116.4119.9Randolph Co.
Richland Co.16,14924.58.326.623.017.6

39.1

93.389.8Richland Co.
Rock Island Co.149,37423.810.027.323.815.1

37.8

94.491.4Rock Island Co.
St. Clair Co.256,08227.78.929.221.113.2

35.3

91.487.2St. Clair Co.
Saline Co.26,73324.08.225.123.719.0

39.9

92.886.5Saline Co.
Sangamon Co.188,95125.08.129.723.713.5

37.3

91.487.3Sangamon Co.
Schuyler Co.7,18923.17.126.324.219.3

40.9

98.495.6Schuyler Co.
Scott Co.5,53725.17.827.323.316.5

38.8

93.392.0Scott Co.
Shelby Co.22,89325.07.626.223.417.8

39.3

97.594.7Shelby Co.
Stark Co.6,33225.16.825.223.719.2

39.9

93.290.1Stark Co.
Stephenson Co.48,97925.27.627.523.316.4

38.5

93.190.3Stephenson Co.
Tazewell Co.128,48524.48.128.624.014.9

38.1

96.894.1Tazewell Co.
LocationPopulationAge %Median
Age
Males per 100 FemalesLocation
under 1818-2425-4445-6465 & overAll Ages18 & Over
United States

281,421,906

25.79.630.222.012.4

35.3

96.393.4United States
Illinois

12,419,293

26.19.830.621.512.1

34.7

95.992.9Illinois
Union Co.18,29323.27.526.725.117.5

40.3

94.591.9Union Co.
Vermilion Co.83,91925.08.427.223.416.0

38.0

96.994.8Vermilion Co.
Wabash Co.12,93724.29.126.423.317.0

39.0

95.392.7Wabash Co.
Warren Co.18,73523.212.424.523.616.3

37.8

93.891.1Warren Co.
Washington Co.15,14825.37.627.323.016.7

38.8

97.695.5Washington Co.
Wayne Co.17,15123.77.925.823.818.8

39.9

94.890.0Wayne Co.
White Co.15,37121.57.725.324.620.9

42.0

91.189.5White Co.
Whiteside Co.60,65325.08.227.023.716.1

38.5

95.993.1Whiteside Co.
Will Co.502,26630.08.132.920.68.3

33.3

99.897.4Will Co.
Williamson Co.61,29622.98.627.924.116.5

38.8

93.991.7Williamson Co.
Winnebago Co.278,41826.48.429.822.712.7

35.9

95.892.6Winnebago Co.
Woodford Co.35,46926.78.726.223.614.8

37.8

95.592.9Woodford Co.

Reading the Chart:

The entries under the Age % heading are percentages showing the age distribution. For example, the entry in the first row (United States) in the under 18 column is 25.7, meaning that 25.7% of the U.S. population is under 18 years of age. The Age% values add up to approximately 100%.

The length of the colored bars in each Age % table cell are in proportion to the value of the number in the cell. For example, the colored bar in the cell showing 25.7 is 25.7% as wide as the cell.

The length of the colored bars under the Males per 100 Females header are proportional to the value when converted to percentages. For example, 110 males per 100 females = 110 males per 210 people = 52.4%.

The numeric values under the Population header are totals. Here the colored bars represent percentages of the highest population of any county in the state. For example, the county with the highest population will have a colored bar that fills the cell. A county with half that many people will have a colored bar that fills half the cell. For small percentages the bar does not appear.

Abbreviations used in location names: Co.=County, C.A.=Census Area, Pa.=Parish, Mu.=Municipio.

Interested in Illinois? Check out Illinois Climate for data and charts about average weather, daylight, and global warming.

Please note that if you set your browser to display very large text sizes, the table cell sizes will change, and the lengths of the colored bars will not be accurate, although they will still show proportions.

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