Idaho State Counties
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Population Characteristics - Median age
(2018)

To resort data: click column headings. To download data: click here.

County Name
Median age
Rank
Median age
Adams155.0
Lemhi253.1
Boise353.0
Custer452.7
Clearwater550.5
Idaho650.2
Valley748.7
Lewis848.6
Bonner948.2
Benewah1046.2
Shoshone1146.2
Washington1246.1
Camas1345.7
Boundary1444.9
Butte1544.8
Gem1644.2
Blaine1743.7
Nez Perce1840.8
Kootenai1940.5
Bear Lake2040.0
Oneida2140.0
Owyhee2239.1
Payette2339.1
Teton2438.6
Fremont2538.0
Clark2637.9
Caribou2737.3
Gooding2837.3
Ada2937.2
Lincoln3036.0
Minidoka3135.1
Twin Falls3234.9
Bingham3334.1
Bannock3434.0
Canyon3534.0
Franklin3633.7
Power3733.3
Jerome3833.2
Bonneville3932.9
Cassia4032.6
Elmore4131.7
Jefferson4231.5
Latah4329.2
Madison4423.2





Source: 1980 and 1990: U.S. Bureau of the Census, (http://www.census.gov/popest/data/historical/index.html);
2000 & 2010: U.S. Bureau of the Census, Census of Population and Housing, (https://data.census.gov/cedsci/);
2011-2018: U.S. Bureau of the Census, Population Estimates - County Characteristics, (http://www.census.gov/popest/); DATE LAST UPDATED: July 1, 2019.



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