Jefferson County Historical Age Data
ACS 2010-2014 data
Total population: 26,620
Median Age (
see rank)
| Jefferson County | 30.80 years old |
| Idaho | 35.20 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| Jefferson County | 30.70 years old |
| Idaho | 34.40 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| Jefferson County | 30.90 years old |
| Idaho | 36.00 years old |
| U.S. | 38.80 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 2,587 | 9.72%, see rank | 7.27% | 6.36% |
| 5 to 9 years | 2,280 | 8.56%, see rank | 7.53% | 6.51% |
| 10 to 14 years | 3,052 | 11.47%, see rank | 7.64% | 6.59% |
| 15 to 19 years | 2,097 | 7.88%, see rank | 7.12% | 6.85% |
| 20 to 24 years | 1,469 | 5.52%, see rank | 6.95% | 7.13% |
| 25 to 34 years | 3,476 | 13.06%, see rank | 13.25% | 13.47% |
| 35 to 44 years | 3,217 | 12.08%, see rank | 12.21% | 12.96% |
| 45 to 54 years | 3,078 | 11.56%, see rank | 12.71% | 14.09% |
| 55 to 64 years | 2,599 | 9.76%, see rank | 11.98% | 12.29% |
| 65 to 74 years | 1,695 | 6.37%, see rank | 7.76% | 7.64% |
| 75 to 84 | 726 | 2.73%, see rank | 3.98% | 4.25% |
| 85 years and over | 344 | 1.29%, see rank | 1.60% | 1.85% |
US Census 2010 data
Total population: 26,140
Median Age (
see rank)
| Jefferson County | 30.00 years old |
| Idaho | 34.60 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Jefferson County | 30.00 years old |
| Idaho | 33.70 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Jefferson County | 30.00 years old |
| Idaho | 35.40 years old |
| U.S. | 38.50 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 2,818 | 10.78%, see rank | 7.77% | 6.54% |
| 5 to 9 years | 2,628 | 10.05%, see rank | 7.73% | 6.59% |
| 10 to 14 years | 2,450 | 9.37%, see rank | 7.46% | 6.70% |
| 15 to 19 years | 2,070 | 7.92%, see rank | 7.36% | 7.14% |
| 20 to 24 years | 1,374 | 5.26%, see rank | 6.90% | 6.99% |
| 25 to 34 years | 3,621 | 13.85%, see rank | 13.33% | 13.30% |
| 35 to 44 years | 3,046 | 11.65%, see rank | 12.22% | 13.30% |
| 45 to 54 years | 3,207 | 12.27%, see rank | 13.30% | 14.58% |
| 55 to 64 years | 2,422 | 9.27%, see rank | 11.50% | 11.82% |
| 65 to 74 years | 1,476 | 5.65%, see rank | 6.99% | 7.03% |
| 75 to 84 | 777 | 2.97%, see rank | 3.82% | 4.23% |
| 85 years and over | 251 | 0.96%, see rank | 1.61% | 1.78% |
ACS 2008-2012 data
Total population: 25,940
Median Age (
see rank)
| Jefferson County | 30.20 years old |
| Idaho | 34.70 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Jefferson County | 30.10 years old |
| Idaho | 33.80 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Jefferson County | 30.30 years old |
| Idaho | 35.50 years old |
| U.S. | 38.50 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 2,707 | 10.44%, see rank | 7.63% | 6.51% |
| 5 to 9 years | 2,396 | 9.24%, see rank | 7.59% | 6.57% |
| 10 to 14 years | 2,695 | 10.39%, see rank | 7.52% | 6.68% |
| 15 to 19 years | 1,941 | 7.48%, see rank | 7.34% | 7.09% |
| 20 to 24 years | 1,449 | 5.59%, see rank | 7.03% | 7.04% |
| 25 to 34 years | 3,539 | 13.64%, see rank | 13.30% | 13.32% |
| 35 to 44 years | 3,109 | 11.99%, see rank | 12.28% | 13.34% |
| 45 to 54 years | 3,186 | 12.28%, see rank | 13.21% | 14.44% |
| 55 to 64 years | 2,367 | 9.12%, see rank | 11.57% | 11.84% |
| 65 to 74 years | 1,546 | 5.96%, see rank | 7.09% | 7.12% |
| 75 to 84 | 740 | 2.85%, see rank | 3.88% | 4.25% |
| 85 years and over | 265 | 1.02%, see rank | 1.57% | 1.78% |
ACS 2006-2010 data
Total population: 24,523
Median Age (
see rank)
| Jefferson County | 30.10 years old |
| Idaho | 34.40 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| Jefferson County | 29.60 years old |
| Idaho | 33.50 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| Jefferson County | 30.30 years old |
| Idaho | 35.30 years old |
| U.S. | 38.10 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 2,562 | 10.45%, see rank | 7.80% | 6.62% |
| 5 to 9 years | 2,512 | 10.24%, see rank | 7.58% | 6.62% |
| 10 to 14 years | 2,185 | 8.91%, see rank | 7.51% | 6.79% |
| 15 to 19 years | 1,899 | 7.74%, see rank | 7.58% | 7.28% |
| 20 to 24 years | 1,430 | 5.83%, see rank | 7.13% | 6.98% |
| 25 to 34 years | 3,371 | 13.75%, see rank | 13.18% | 13.22% |
| 35 to 44 years | 3,022 | 12.32%, see rank | 12.62% | 13.89% |
| 45 to 54 years | 3,043 | 12.41%, see rank | 13.58% | 14.57% |
| 55 to 64 years | 2,123 | 8.66%, see rank | 11.02% | 11.28% |
| 65 to 74 years | 1,397 | 5.70%, see rank | 6.60% | 6.74% |
| 75 to 84 | 692 | 2.82%, see rank | 3.85% | 4.30% |
| 85 years and over | 287 | 1.17%, see rank | 1.54% | 1.70% |
ACS 2005-2009 data
Total population: 22,892
Median Age (
see rank)
| Jefferson County | 29.80 years old |
| Idaho | 34.00 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| Jefferson County | 28.70 years old |
| Idaho | 33.20 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| Jefferson County | 30.80 years old |
| Idaho | 34.90 years old |
| U.S. | 37.90 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 2,384 | 10.41%, see rank | 7.96% | 6.92% |
| 5 to 9 years | 2,402 | 10.49%, see rank | 7.32% | 6.59% |
| 10 to 14 years | 2,010 | 8.78%, see rank | 7.43% | 6.83% |
| 15 to 19 years | 1,857 | 8.11%, see rank | 7.66% | 7.15% |
| 20 to 24 years | 1,429 | 6.24%, see rank | 7.55% | 7.02% |
| 25 to 34 years | 2,878 | 12.57%, see rank | 13.33% | 13.42% |
| 35 to 44 years | 2,864 | 12.51%, see rank | 12.81% | 14.18% |
| 45 to 54 years | 2,934 | 12.82%, see rank | 13.56% | 14.48% |
| 55 to 64 years | 2,031 | 8.87%, see rank | 10.64% | 10.81% |
| 65 to 74 years | 1,169 | 5.11%, see rank | 6.26% | 6.50% |
| 75 to 84 | 712 | 3.11%, see rank | 3.91% | 4.40% |
| 85 years and over | 222 | 0.97%, see rank | 1.57% | 1.71% |
US Census 2000 data
Total population: 19,155
Median Age (
see rank)
| Jefferson County | 28.80 years old |
| Idaho | 33.20 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| Jefferson County | 27.60 years old |
| Idaho | 32.20 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| Jefferson County | 29.90 years old |
| Idaho | 34.20 years old |
| U.S. | 36.50 years old |
| | Jefferson County | % of the Total Population | Idaho | U.S. |
| Under 5 years | 1,711 | 8.93%, see rank | 7.55% | 6.81% |
| 5 to 9 years | 1,893 | 9.88%, see rank | 7.79% | 7.30% |
| 10 to 14 years | 2,058 | 10.74%, see rank | 8.08% | 7.29% |
| 15 to 19 years | 1,948 | 10.17%, see rank | 8.57% | 7.18% |
| 20 to 24 years | 1,182 | 6.17%, see rank | 7.26% | 6.74% |
| 25 to 34 years | 2,116 | 11.05%, see rank | 13.09% | 14.18% |
| 35 to 44 years | 2,770 | 14.46%, see rank | 14.91% | 16.04% |
| 45 to 54 years | 2,257 | 11.78%, see rank | 13.16% | 13.39% |
| 55 to 64 years | 1,445 | 7.54%, see rank | 8.31% | 8.63% |
| 65 to 74 years | 972 | 5.07%, see rank | 5.87% | 6.54% |
| 75 to 84 | 632 | 3.30%, see rank | 4.01% | 4.39% |
| 85 years and over | 171 | 0.89%, see rank | 1.40% | 1.51% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
