Census Charts Index > Iowa

Iowa Census Data: Age & Sex by County

Age and sex distributions for Iowa 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.


Iowa 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
Iowa

2,926,324

25.110.227.622.214.9

36.6

96.393.4Iowa
Adair Co.8,24323.96.924.422.722.1

41.8

95.993.0Adair Co.
Adams Co.4,48223.96.324.124.221.4

41.9

96.792.7Adams Co.
Allamakee Co.14,67525.47.025.623.618.4

39.7

100.298.9Allamakee Co.
Appanoose Co.13,72123.77.825.123.520.0

40.6

91.589.5Appanoose Co.
Audubon Co.6,83025.95.022.722.923.5

42.4

92.089.1Audubon Co.
Benton Co.25,30827.46.829.321.115.4

37.2

100.095.8Benton Co.
Black Hawk Co.128,01223.115.725.222.014.0

34.4

92.388.8Black Hawk Co.
Boone Co.26,22424.88.427.123.316.4

38.6

95.991.7Boone Co.
Bremer Co.23,32524.112.023.923.916.0

38.1

93.689.3Bremer Co.
Buchanan Co.21,09328.68.126.322.514.5

36.4

98.794.4Buchanan Co.
Buena Vista Co.20,41125.412.225.420.216.9

36.4

100.497.4Buena Vista Co.
Butler Co.15,30524.46.424.924.220.1

41.3

96.293.7Butler Co.
Calhoun Co.11,11523.16.424.823.722.1

42.4

98.197.6Calhoun Co.
Carroll Co.21,42126.97.425.921.018.7

38.7

95.192.0Carroll Co.
Cass Co.14,68423.86.824.823.820.8

41.6

94.390.2Cass Co.
Cedar Co.18,18725.36.927.723.816.2

39.2

97.594.6Cedar Co.
Cerro Gordo Co.46,44723.89.026.423.217.7

39.3

92.889.1Cerro Gordo Co.
Cherokee Co.13,03524.66.824.024.320.4

41.7

97.492.7Cherokee Co.
Chickasaw Co.13,09526.16.925.623.417.9

39.7

100.196.5Chickasaw Co.
Clarke Co.9,13326.37.626.522.517.1

38.6

97.094.0Clarke Co.
Clay Co.17,37224.78.026.922.518.0

39.4

93.390.9Clay Co.
Clayton Co.18,67825.46.526.023.618.5

40.2

97.695.5Clayton Co.
Clinton Co.50,14925.68.227.023.315.8

38.2

94.391.2Clinton Co.
Crawford Co.16,94226.58.125.722.517.1

38.2

100.998.8Crawford Co.
Dallas Co.40,75028.26.932.121.611.1

35.1

97.793.8Dallas Co.
Davis Co.8,54127.17.425.222.917.4

38.5

97.994.1Davis Co.
Decatur Co.8,68923.016.321.621.517.7

36.4

95.791.9Decatur Co.
Delaware Co.18,40429.07.027.621.515.0

37.1

98.496.6Delaware Co.
Des Moines Co.42,35124.48.526.124.316.7

38.9

93.590.3Des Moines Co.
Dickinson Co.16,42421.96.623.926.920.6

43.3

95.092.3Dickinson 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
Iowa

2,926,324

25.110.227.622.214.9

36.6

96.393.4Iowa
Dubuque Co.89,14325.610.227.222.314.7

36.5

94.491.3Dubuque Co.
Emmet Co.11,02724.210.123.822.519.4

39.6

94.493.3Emmet Co.
Fayette Co.22,00825.08.624.922.419.0

39.4

97.595.1Fayette Co.
Floyd Co.16,90025.17.024.424.219.2

40.3

93.590.4Floyd Co.
Franklin Co.10,70424.27.324.023.920.5

41.3

96.493.9Franklin Co.
Fremont Co.8,01025.16.024.324.719.8

41.2

95.591.8Fremont Co.
Greene Co.10,36625.66.124.322.421.6

41.0

95.589.2Greene Co.
Grundy Co.12,36925.26.325.124.119.3

40.8

95.792.1Grundy Co.
Guthrie Co.11,35323.66.324.824.920.5

41.9

97.694.3Guthrie Co.
Hamilton Co.16,43825.47.127.122.418.0

39.1

98.094.8Hamilton Co.
Hancock Co.12,10026.56.625.523.517.9

39.7

96.895.0Hancock Co.
Hardin Co.18,81224.78.423.822.420.7

40.6

95.790.1Hardin Co.
Harrison Co.15,66626.26.827.022.317.7

38.9

96.591.8Harrison Co.
Henry Co.20,33624.79.029.222.514.7

37.1

102.5102.8Henry Co.
Howard Co.9,93226.36.825.421.320.1

39.5

97.096.3Howard Co.
Humboldt Co.10,38124.97.024.622.521.0

41.3

95.792.2Humboldt Co.
Ida Co.7,83725.56.124.022.721.8

41.5

93.991.4Ida Co.
Iowa Co.15,67126.46.327.822.417.1

38.8

95.093.2Iowa Co.
Jackson Co.20,29626.07.026.523.217.3

39.1

97.193.9Jackson Co.
Jasper Co.37,21324.67.428.623.416.0

38.5

101.699.7Jasper Co.
Jefferson Co.16,18124.47.624.429.813.8

41.1

95.993.6Jefferson Co.
Johnson Co.111,00620.123.430.818.27.4

28.4

99.197.3Johnson Co.
Jones Co.20,22124.17.929.023.315.8

38.5

109.3111.6Jones Co.
Keokuk Co.11,40025.77.025.521.620.2

40.0

94.191.8Keokuk Co.
Kossuth Co.17,16325.86.124.323.620.1

41.3

95.394.0Kossuth Co.
Lee Co.38,05224.47.826.724.616.5

39.5

97.996.4Lee Co.
Linn Co.191,70125.310.130.322.112.2

35.2

96.193.4Linn Co.
Louisa Co.12,18327.77.928.721.714.1

35.9

98.996.0Louisa Co.
Lucas Co.9,42225.47.324.623.419.3

39.9

94.591.1Lucas Co.
Lyon Co.11,76328.07.624.620.918.8

38.1

98.494.6Lyon 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
Iowa

2,926,324

25.110.227.622.214.9

36.6

96.393.4Iowa
Madison Co.14,01927.16.927.423.415.2

37.9

97.493.1Madison Co.
Mahaska Co.22,33525.79.426.821.716.3

37.2

99.196.9Mahaska Co.
Marion Co.32,05225.310.226.522.115.9

37.2

98.695.8Marion Co.
Marshall Co.39,31125.38.126.323.916.4

38.6

99.296.5Marshall Co.
Mills Co.14,54726.87.028.125.512.6

38.1

100.696.7Mills Co.
Mitchell Co.10,87426.56.124.221.721.6

40.6

95.792.0Mitchell Co.
Monona Co.10,02023.26.223.323.323.9

43.0

94.290.5Monona Co.
Monroe Co.8,01625.37.225.023.019.5

39.7

94.992.6Monroe Co.
Montgomery Co.11,77125.06.525.522.820.3

40.4

90.287.3Montgomery Co.
Muscatine Co.41,72226.98.628.822.812.9

36.1

98.194.9Muscatine Co.
O'Brien Co.15,10224.87.824.122.121.1

40.7

95.892.4O'Brien Co.
Osceola Co.7,00326.17.226.221.618.9

39.7

95.094.3Osceola Co.
Page Co.16,97623.37.926.322.819.8

40.2

102.7101.8Page Co.
Palo Alto Co.10,14724.09.523.221.921.3

40.7

94.792.1Palo Alto Co.
Plymouth Co.24,84928.37.226.422.016.0

37.8

98.895.7Plymouth Co.
Pocahontas Co.8,66225.45.323.424.121.7

42.5

96.693.2Pocahontas Co.
Polk Co.374,60125.79.432.221.511.1

34.4

94.290.7Polk Co.
Pottawattamie Co.87,70426.09.128.622.713.7

36.5

95.592.6Pottawattamie Co.
Poweshiek Co.18,81522.712.824.422.517.6

38.4

92.588.8Poweshiek Co.
Ringgold Co.5,46924.06.921.423.624.0

43.2

94.189.4Ringgold Co.
Sac Co.11,52924.16.923.522.822.7

42.1

95.591.8Sac Co.
Scott Co.158,66826.59.329.423.011.8

35.4

95.892.5Scott Co.
Shelby Co.13,17326.45.725.222.420.4

40.5

95.993.3Shelby Co.
Sioux Co.31,58927.115.223.519.115.0

32.8

96.393.5Sioux Co.
Story Co.79,98119.128.325.517.39.8

26.5

104.6104.4Story Co.
Tama Co.18,10326.67.025.222.518.7

39.1

96.692.5Tama Co.
Taylor Co.6,95823.97.523.422.822.4

41.6

94.192.0Taylor Co.
Union Co.12,30923.38.725.324.018.7

40.1

92.189.0Union Co.
Van Buren Co.7,80924.87.024.424.819.1

40.8

99.597.9Van Buren Co.
Wapello Co.36,05123.39.726.023.317.8

39.2

94.891.7Wapello 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
Iowa

2,926,324

25.110.227.622.214.9

36.6

96.393.4Iowa
Warren Co.40,67127.09.728.223.211.8

36.0

94.691.8Warren Co.
Washington Co.20,67026.17.026.822.317.9

38.8

93.090.1Washington Co.
Wayne Co.6,73023.95.923.423.023.8

43.0

91.790.8Wayne Co.
Webster Co.40,23524.511.125.521.617.4

37.7

100.398.2Webster Co.
Winnebago Co.11,72324.19.824.123.118.9

39.8

95.592.9Winnebago Co.
Winneshiek Co.21,31023.016.724.220.415.7

35.7

96.894.3Winneshiek Co.
Woodbury Co.103,87727.310.228.320.813.4

34.2

96.192.8Woodbury Co.
Worth Co.7,90924.36.526.323.519.4

40.7

98.595.2Worth Co.
Wright Co.14,33424.56.524.523.321.2

41.4

96.292.3Wright 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 Iowa? Check out Iowa 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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