King County Historical Age Data
ACS 2010-2014 data
Total population: 2,008,997
Median Age (
see rank)
| King County | 37.20 years old |
| Washington | 37.40 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| King County | 36.40 years old |
| Washington | 36.30 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| King County | 38.00 years old |
| Washington | 38.40 years old |
| U.S. | 38.80 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 124,655 | 6.20%, see rank | 6.43% | 6.36% |
| 5 to 9 years | 118,064 | 5.88%, see rank | 6.33% | 6.51% |
| 10 to 14 years | 113,285 | 5.64%, see rank | 6.40% | 6.59% |
| 15 to 19 years | 115,830 | 5.77%, see rank | 6.49% | 6.85% |
| 20 to 24 years | 132,775 | 6.61%, see rank | 7.01% | 7.13% |
| 25 to 34 years | 333,381 | 16.59%, see rank | 14.18% | 13.47% |
| 35 to 44 years | 303,555 | 15.11%, see rank | 13.23% | 12.96% |
| 45 to 54 years | 290,828 | 14.48%, see rank | 13.98% | 14.09% |
| 55 to 64 years | 244,207 | 12.16%, see rank | 12.78% | 12.29% |
| 65 to 74 years | 130,640 | 6.50%, see rank | 7.59% | 7.64% |
| 75 to 84 | 66,253 | 3.30%, see rank | 3.81% | 4.25% |
| 85 years and over | 35,524 | 1.77%, see rank | 1.78% | 1.85% |
US Census 2010 data
Total population: 1,931,249
Median Age (
see rank)
| King County | 37.10 years old |
| Washington | 37.30 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| King County | 36.30 years old |
| Washington | 36.20 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| King County | 37.90 years old |
| Washington | 38.30 years old |
| U.S. | 38.50 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 120,294 | 6.23%, see rank | 6.54% | 6.54% |
| 5 to 9 years | 113,295 | 5.87%, see rank | 6.39% | 6.59% |
| 10 to 14 years | 110,789 | 5.74%, see rank | 6.52% | 6.70% |
| 15 to 19 years | 117,514 | 6.08%, see rank | 6.87% | 7.14% |
| 20 to 24 years | 129,822 | 6.72%, see rank | 6.86% | 6.99% |
| 25 to 34 years | 312,717 | 16.19%, see rank | 13.89% | 13.30% |
| 35 to 44 years | 296,790 | 15.37%, see rank | 13.51% | 13.30% |
| 45 to 54 years | 291,132 | 15.07%, see rank | 14.70% | 14.58% |
| 55 to 64 years | 228,217 | 11.82%, see rank | 12.42% | 11.82% |
| 65 to 74 years | 112,747 | 5.84%, see rank | 6.80% | 7.03% |
| 75 to 84 | 64,148 | 3.32%, see rank | 3.77% | 4.23% |
| 85 years and over | 33,784 | 1.75%, see rank | 1.74% | 1.78% |
ACS 2008-2012 data
Total population: 1,940,777
Median Age (
see rank)
| King County | 37.10 years old |
| Washington | 37.20 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| King County | 36.20 years old |
| Washington | 36.20 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| King County | 37.90 years old |
| Washington | 38.30 years old |
| U.S. | 38.50 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 120,618 | 6.21%, see rank | 6.50% | 6.51% |
| 5 to 9 years | 112,878 | 5.82%, see rank | 6.35% | 6.57% |
| 10 to 14 years | 111,002 | 5.72%, see rank | 6.50% | 6.68% |
| 15 to 19 years | 116,374 | 6.00%, see rank | 6.79% | 7.09% |
| 20 to 24 years | 131,151 | 6.76%, see rank | 6.98% | 7.04% |
| 25 to 34 years | 317,135 | 16.34%, see rank | 13.94% | 13.32% |
| 35 to 44 years | 298,870 | 15.40%, see rank | 13.54% | 13.34% |
| 45 to 54 years | 290,226 | 14.95%, see rank | 14.56% | 14.44% |
| 55 to 64 years | 229,255 | 11.81%, see rank | 12.43% | 11.84% |
| 65 to 74 years | 114,645 | 5.91%, see rank | 6.90% | 7.12% |
| 75 to 84 | 65,691 | 3.38%, see rank | 3.83% | 4.25% |
| 85 years and over | 32,932 | 1.70%, see rank | 1.70% | 1.78% |
ACS 2006-2010 data
Total population: 1,879,189
Median Age (
see rank)
| King County | 36.90 years old |
| Washington | 37.00 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| King County | 36.00 years old |
| Washington | 36.00 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| King County | 37.70 years old |
| Washington | 38.00 years old |
| U.S. | 38.10 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 116,710 | 6.21%, see rank | 6.50% | 6.62% |
| 5 to 9 years | 109,899 | 5.85%, see rank | 6.41% | 6.62% |
| 10 to 14 years | 108,725 | 5.79%, see rank | 6.64% | 6.79% |
| 15 to 19 years | 116,395 | 6.19%, see rank | 7.05% | 7.28% |
| 20 to 24 years | 127,724 | 6.80%, see rank | 6.94% | 6.98% |
| 25 to 34 years | 303,616 | 16.16%, see rank | 13.67% | 13.22% |
| 35 to 44 years | 298,119 | 15.86%, see rank | 14.07% | 13.89% |
| 45 to 54 years | 287,738 | 15.31%, see rank | 14.95% | 14.57% |
| 55 to 64 years | 211,840 | 11.27%, see rank | 11.86% | 11.28% |
| 65 to 74 years | 102,050 | 5.43%, see rank | 6.38% | 6.74% |
| 75 to 84 | 65,391 | 3.48%, see rank | 3.87% | 4.30% |
| 85 years and over | 30,982 | 1.65%, see rank | 1.65% | 1.70% |
ACS 2005-2009 data
Total population: 1,858,788
Median Age (
see rank)
| King County | 36.80 years old |
| Washington | 36.80 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| King County | 36.00 years old |
| Washington | 35.70 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| King County | 37.60 years old |
| Washington | 37.80 years old |
| U.S. | 37.90 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 118,391 | 6.37%, see rank | 6.67% | 6.92% |
| 5 to 9 years | 106,156 | 5.71%, see rank | 6.35% | 6.59% |
| 10 to 14 years | 109,045 | 5.87%, see rank | 6.71% | 6.83% |
| 15 to 19 years | 109,544 | 5.89%, see rank | 6.90% | 7.15% |
| 20 to 24 years | 119,467 | 6.43%, see rank | 7.03% | 7.02% |
| 25 to 34 years | 312,127 | 16.79%, see rank | 13.85% | 13.42% |
| 35 to 44 years | 298,202 | 16.04%, see rank | 14.28% | 14.18% |
| 45 to 54 years | 287,558 | 15.47%, see rank | 15.03% | 14.48% |
| 55 to 64 years | 202,344 | 10.89%, see rank | 11.43% | 10.81% |
| 65 to 74 years | 97,748 | 5.26%, see rank | 6.18% | 6.50% |
| 75 to 84 | 67,852 | 3.65%, see rank | 3.97% | 4.40% |
| 85 years and over | 30,354 | 1.63%, see rank | 1.61% | 1.71% |
US Census 2000 data
Total population: 1,737,034
Median Age (
see rank)
| King County | 35.70 years old |
| Washington | 35.30 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| King County | 34.90 years old |
| Washington | 34.40 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| King County | 36.60 years old |
| Washington | 36.30 years old |
| U.S. | 36.50 years old |
| | King County | % of the Total Population | Washington | U.S. |
| Under 5 years | 105,321 | 6.06%, see rank | 6.69% | 6.81% |
| 5 to 9 years | 111,162 | 6.40%, see rank | 7.23% | 7.30% |
| 10 to 14 years | 109,992 | 6.33%, see rank | 7.38% | 7.29% |
| 15 to 19 years | 108,261 | 6.23%, see rank | 7.26% | 7.18% |
| 20 to 24 years | 116,597 | 6.71%, see rank | 6.62% | 6.74% |
| 25 to 34 years | 294,443 | 16.95%, see rank | 14.27% | 14.18% |
| 35 to 44 years | 308,823 | 17.78%, see rank | 16.54% | 16.04% |
| 45 to 54 years | 259,136 | 14.92%, see rank | 14.35% | 13.39% |
| 55 to 64 years | 141,527 | 8.15%, see rank | 8.43% | 8.63% |
| 65 to 74 years | 88,884 | 5.12%, see rank | 5.72% | 6.54% |
| 75 to 84 | 68,348 | 3.93%, see rank | 4.09% | 4.39% |
| 85 years and over | 24,540 | 1.41%, see rank | 1.43% | 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.
