Jefferson County Historical Age Data
ACS 2010-2014 data
Total population: 17,102
Median Age (
see rank)
| Jefferson County | 42.70 years old |
| Iowa | 38.00 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| Jefferson County | 39.30 years old |
| Iowa | 36.70 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| Jefferson County | 45.60 years old |
| Iowa | 39.40 years old |
| U.S. | 38.80 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 783 | 4.58%, see rank | 6.39% | 6.36% |
| 5 to 9 years | 718 | 4.20%, see rank | 6.62% | 6.51% |
| 10 to 14 years | 1,112 | 6.50%, see rank | 6.58% | 6.59% |
| 15 to 19 years | 983 | 5.75%, see rank | 6.96% | 6.85% |
| 20 to 24 years | 1,516 | 8.86%, see rank | 7.21% | 7.13% |
| 25 to 34 years | 2,102 | 12.29%, see rank | 12.65% | 13.47% |
| 35 to 44 years | 1,718 | 10.05%, see rank | 11.80% | 12.96% |
| 45 to 54 years | 2,157 | 12.61%, see rank | 13.73% | 14.09% |
| 55 to 64 years | 3,226 | 18.86%, see rank | 12.80% | 12.29% |
| 65 to 74 years | 1,581 | 9.24%, see rank | 7.81% | 7.64% |
| 75 to 84 | 773 | 4.52%, see rank | 4.98% | 4.25% |
| 85 years and over | 433 | 2.53%, see rank | 2.48% | 1.85% |
US Census 2010 data
Total population: 16,843
Median Age (
see rank)
| Jefferson County | 43.50 years old |
| Iowa | 38.10 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Jefferson County | 38.90 years old |
| Iowa | 36.60 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Jefferson County | 47.80 years old |
| Iowa | 39.50 years old |
| U.S. | 38.50 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 762 | 4.52%, see rank | 6.63% | 6.54% |
| 5 to 9 years | 807 | 4.79%, see rank | 6.59% | 6.59% |
| 10 to 14 years | 892 | 5.30%, see rank | 6.59% | 6.70% |
| 15 to 19 years | 944 | 5.60%, see rank | 7.12% | 7.14% |
| 20 to 24 years | 1,538 | 9.13%, see rank | 7.00% | 6.99% |
| 25 to 34 years | 2,050 | 12.17%, see rank | 12.56% | 13.30% |
| 35 to 44 years | 1,663 | 9.87%, see rank | 11.97% | 13.30% |
| 45 to 54 years | 2,358 | 14.00%, see rank | 14.43% | 14.58% |
| 55 to 64 years | 3,328 | 19.76%, see rank | 12.24% | 11.82% |
| 65 to 74 years | 1,280 | 7.60%, see rank | 7.37% | 7.03% |
| 75 to 84 | 795 | 4.72%, see rank | 5.04% | 4.23% |
| 85 years and over | 426 | 2.53%, see rank | 2.45% | 1.78% |
ACS 2008-2012 data
Total population: 16,791
Median Age (
see rank)
| Jefferson County | 44.00 years old |
| Iowa | 38.00 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Jefferson County | 42.50 years old |
| Iowa | 36.60 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Jefferson County | 45.60 years old |
| Iowa | 39.40 years old |
| U.S. | 38.50 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 737 | 4.39%, see rank | 6.53% | 6.51% |
| 5 to 9 years | 875 | 5.21%, see rank | 6.58% | 6.57% |
| 10 to 14 years | 1,074 | 6.40%, see rank | 6.60% | 6.68% |
| 15 to 19 years | 1,098 | 6.54%, see rank | 7.14% | 7.09% |
| 20 to 24 years | 1,250 | 7.44%, see rank | 7.08% | 7.04% |
| 25 to 34 years | 1,856 | 11.05%, see rank | 12.55% | 13.32% |
| 35 to 44 years | 1,718 | 10.23%, see rank | 12.02% | 13.34% |
| 45 to 54 years | 2,417 | 14.39%, see rank | 14.28% | 14.44% |
| 55 to 64 years | 3,201 | 19.06%, see rank | 12.27% | 11.84% |
| 65 to 74 years | 1,341 | 7.99%, see rank | 7.45% | 7.12% |
| 75 to 84 | 700 | 4.17%, see rank | 5.08% | 4.25% |
| 85 years and over | 524 | 3.12%, see rank | 2.42% | 1.78% |
ACS 2006-2010 data
Total population: 16,643
Median Age (
see rank)
| Jefferson County | 44.90 years old |
| Iowa | 38.00 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| Jefferson County | 43.50 years old |
| Iowa | 36.60 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| Jefferson County | 46.00 years old |
| Iowa | 39.30 years old |
| U.S. | 38.10 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 810 | 4.87%, see rank | 6.56% | 6.62% |
| 5 to 9 years | 793 | 4.76%, see rank | 6.57% | 6.62% |
| 10 to 14 years | 987 | 5.93%, see rank | 6.64% | 6.79% |
| 15 to 19 years | 1,067 | 6.41%, see rank | 7.28% | 7.28% |
| 20 to 24 years | 1,037 | 6.23%, see rank | 7.14% | 6.98% |
| 25 to 34 years | 1,808 | 10.86%, see rank | 12.25% | 13.22% |
| 35 to 44 years | 1,832 | 11.01%, see rank | 12.56% | 13.89% |
| 45 to 54 years | 2,704 | 16.25%, see rank | 14.61% | 14.57% |
| 55 to 64 years | 3,103 | 18.64%, see rank | 11.58% | 11.28% |
| 65 to 74 years | 1,234 | 7.41%, see rank | 7.21% | 6.74% |
| 75 to 84 | 836 | 5.02%, see rank | 5.24% | 4.30% |
| 85 years and over | 432 | 2.60%, see rank | 2.36% | 1.70% |
ACS 2005-2009 data
Total population: 15,496
Median Age (
see rank)
| Jefferson County | 44.60 years old |
| Iowa | 37.90 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| Jefferson County | 43.20 years old |
| Iowa | 36.50 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| Jefferson County | 45.90 years old |
| Iowa | 39.30 years old |
| U.S. | 37.90 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 741 | 4.78%, see rank | 6.61% | 6.92% |
| 5 to 9 years | 760 | 4.90%, see rank | 6.38% | 6.59% |
| 10 to 14 years | 949 | 6.12%, see rank | 6.59% | 6.83% |
| 15 to 19 years | 1,070 | 6.91%, see rank | 7.37% | 7.15% |
| 20 to 24 years | 983 | 6.34%, see rank | 7.65% | 7.02% |
| 25 to 34 years | 1,605 | 10.36%, see rank | 11.90% | 13.42% |
| 35 to 44 years | 1,716 | 11.07%, see rank | 12.95% | 14.18% |
| 45 to 54 years | 2,822 | 18.21%, see rank | 14.71% | 14.48% |
| 55 to 64 years | 2,635 | 17.00%, see rank | 11.11% | 10.81% |
| 65 to 74 years | 1,007 | 6.50%, see rank | 7.05% | 6.50% |
| 75 to 84 | 770 | 4.97%, see rank | 5.30% | 4.40% |
| 85 years and over | 438 | 2.83%, see rank | 2.38% | 1.71% |
US Census 2000 data
Total population: 16,181
Median Age (
see rank)
| Jefferson County | 41.10 years old |
| Iowa | 36.60 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| Jefferson County | 40.00 years old |
| Iowa | 35.20 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| Jefferson County | 42.00 years old |
| Iowa | 38.00 years old |
| U.S. | 36.50 years old |
| | Jefferson County | % of the Total Population | Iowa | U.S. |
| Under 5 years | 877 | 5.42%, see rank | 6.44% | 6.81% |
| 5 to 9 years | 1,004 | 6.20%, see rank | 6.92% | 7.30% |
| 10 to 14 years | 1,264 | 7.81%, see rank | 7.19% | 7.29% |
| 15 to 19 years | 1,213 | 7.50%, see rank | 7.74% | 7.18% |
| 20 to 24 years | 819 | 5.06%, see rank | 6.96% | 6.74% |
| 25 to 34 years | 1,658 | 10.25%, see rank | 12.41% | 14.18% |
| 35 to 44 years | 2,293 | 14.17%, see rank | 15.21% | 16.04% |
| 45 to 54 years | 3,422 | 21.15%, see rank | 13.42% | 13.39% |
| 55 to 64 years | 1,400 | 8.65%, see rank | 8.80% | 8.63% |
| 65 to 74 years | 1,013 | 6.26%, see rank | 7.24% | 6.54% |
| 75 to 84 | 849 | 5.25%, see rank | 5.44% | 4.39% |
| 85 years and over | 369 | 2.28%, see rank | 2.23% | 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.
