Knox County Historical Age Data
ACS 2010-2014 data
Total population: 52,447
Median Age (
see rank)
| Knox County | 41.50 years old |
| Illinois | 37.00 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| Knox County | 39.80 years old |
| Illinois | 35.70 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| Knox County | 44.40 years old |
| Illinois | 38.40 years old |
| U.S. | 38.80 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,645 | 5.04%, see rank | 6.30% | 6.36% |
| 5 to 9 years | 3,061 | 5.84%, see rank | 6.58% | 6.51% |
| 10 to 14 years | 3,007 | 5.73%, see rank | 6.71% | 6.59% |
| 15 to 19 years | 3,418 | 6.52%, see rank | 6.94% | 6.85% |
| 20 to 24 years | 3,774 | 7.20%, see rank | 6.95% | 7.13% |
| 25 to 34 years | 6,083 | 11.60%, see rank | 13.84% | 13.47% |
| 35 to 44 years | 5,988 | 11.42%, see rank | 13.20% | 12.96% |
| 45 to 54 years | 7,137 | 13.61%, see rank | 14.17% | 14.09% |
| 55 to 64 years | 7,361 | 14.04%, see rank | 12.13% | 12.29% |
| 65 to 74 years | 5,162 | 9.84%, see rank | 7.18% | 7.64% |
| 75 to 84 | 3,352 | 6.39%, see rank | 4.10% | 4.25% |
| 85 years and over | 1,459 | 2.78%, see rank | 1.90% | 1.85% |
US Census 2010 data
Total population: 52,919
Median Age (
see rank)
| Knox County | 42.00 years old |
| Illinois | 36.60 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Knox County | 39.80 years old |
| Illinois | 35.20 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Knox County | 44.40 years old |
| Illinois | 37.90 years old |
| U.S. | 38.50 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,776 | 5.25%, see rank | 6.51% | 6.54% |
| 5 to 9 years | 3,118 | 5.89%, see rank | 6.70% | 6.59% |
| 10 to 14 years | 3,057 | 5.78%, see rank | 6.85% | 6.70% |
| 15 to 19 years | 3,580 | 6.77%, see rank | 7.19% | 7.14% |
| 20 to 24 years | 3,639 | 6.88%, see rank | 6.85% | 6.99% |
| 25 to 34 years | 6,091 | 11.51%, see rank | 13.84% | 13.30% |
| 35 to 44 years | 6,087 | 11.50%, see rank | 13.45% | 13.30% |
| 45 to 54 years | 7,525 | 14.22%, see rank | 14.58% | 14.58% |
| 55 to 64 years | 7,284 | 13.76%, see rank | 11.48% | 11.82% |
| 65 to 74 years | 4,864 | 9.19%, see rank | 6.62% | 7.03% |
| 75 to 84 | 3,347 | 6.32%, see rank | 4.09% | 4.23% |
| 85 years and over | 1,551 | 2.93%, see rank | 1.83% | 1.78% |
ACS 2008-2012 data
Total population: 52,698
Median Age (
see rank)
| Knox County | 41.80 years old |
| Illinois | 36.60 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Knox County | 40.10 years old |
| Illinois | 35.30 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Knox County | 44.30 years old |
| Illinois | 38.00 years old |
| U.S. | 38.50 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,719 | 5.16%, see rank | 6.50% | 6.51% |
| 5 to 9 years | 2,964 | 5.62%, see rank | 6.68% | 6.57% |
| 10 to 14 years | 3,125 | 5.93%, see rank | 6.82% | 6.68% |
| 15 to 19 years | 3,493 | 6.63%, see rank | 7.16% | 7.09% |
| 20 to 24 years | 3,697 | 7.02%, see rank | 6.88% | 7.04% |
| 25 to 34 years | 6,116 | 11.61%, see rank | 13.84% | 13.32% |
| 35 to 44 years | 6,076 | 11.53%, see rank | 13.49% | 13.34% |
| 45 to 54 years | 7,526 | 14.28%, see rank | 14.46% | 14.44% |
| 55 to 64 years | 7,186 | 13.64%, see rank | 11.52% | 11.84% |
| 65 to 74 years | 4,925 | 9.35%, see rank | 6.71% | 7.12% |
| 75 to 84 | 3,227 | 6.12%, see rank | 4.11% | 4.25% |
| 85 years and over | 1,644 | 3.12%, see rank | 1.83% | 1.78% |
ACS 2006-2010 data
Total population: 52,932
Median Age (
see rank)
| Knox County | 41.40 years old |
| Illinois | 36.20 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| Knox County | 38.80 years old |
| Illinois | 34.90 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| Knox County | 43.80 years old |
| Illinois | 37.60 years old |
| U.S. | 38.10 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,808 | 5.30%, see rank | 6.63% | 6.62% |
| 5 to 9 years | 3,040 | 5.74%, see rank | 6.78% | 6.62% |
| 10 to 14 years | 3,155 | 5.96%, see rank | 6.94% | 6.79% |
| 15 to 19 years | 3,678 | 6.95%, see rank | 7.31% | 7.28% |
| 20 to 24 years | 3,709 | 7.01%, see rank | 6.86% | 6.98% |
| 25 to 34 years | 6,025 | 11.38%, see rank | 13.78% | 13.22% |
| 35 to 44 years | 6,371 | 12.04%, see rank | 13.96% | 13.89% |
| 45 to 54 years | 7,616 | 14.39%, see rank | 14.55% | 14.57% |
| 55 to 64 years | 6,940 | 13.11%, see rank | 10.89% | 11.28% |
| 65 to 74 years | 4,687 | 8.85%, see rank | 6.36% | 6.74% |
| 75 to 84 | 3,307 | 6.25%, see rank | 4.17% | 4.30% |
| 85 years and over | 1,596 | 3.02%, see rank | 1.77% | 1.70% |
ACS 2005-2009 data
Total population: 52,077
Median Age (
see rank)
| Knox County | 41.30 years old |
| Illinois | 35.90 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| Knox County | 38.60 years old |
| Illinois | 34.60 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| Knox County | 44.00 years old |
| Illinois | 37.20 years old |
| U.S. | 37.90 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,828 | 5.43%, see rank | 6.97% | 6.92% |
| 5 to 9 years | 3,161 | 6.07%, see rank | 6.76% | 6.59% |
| 10 to 14 years | 2,893 | 5.56%, see rank | 6.96% | 6.83% |
| 15 to 19 years | 3,483 | 6.69%, see rank | 7.24% | 7.15% |
| 20 to 24 years | 3,864 | 7.42%, see rank | 7.08% | 7.02% |
| 25 to 34 years | 5,915 | 11.36%, see rank | 13.73% | 13.42% |
| 35 to 44 years | 6,454 | 12.39%, see rank | 14.23% | 14.18% |
| 45 to 54 years | 7,493 | 14.39%, see rank | 14.47% | 14.48% |
| 55 to 64 years | 6,603 | 12.68%, see rank | 10.43% | 10.81% |
| 65 to 74 years | 4,572 | 8.78%, see rank | 6.21% | 6.50% |
| 75 to 84 | 3,178 | 6.10%, see rank | 4.17% | 4.40% |
| 85 years and over | 1,633 | 3.14%, see rank | 1.74% | 1.71% |
US Census 2000 data
Total population: 55,836
Median Age (
see rank)
| Knox County | 39.40 years old |
| Illinois | 34.70 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| Knox County | 37.30 years old |
| Illinois | 33.30 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| Knox County | 41.50 years old |
| Illinois | 36.00 years old |
| U.S. | 36.50 years old |
| | Knox County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,221 | 5.77%, see rank | 7.06% | 6.81% |
| 5 to 9 years | 3,389 | 6.07%, see rank | 7.49% | 7.30% |
| 10 to 14 years | 3,524 | 6.31%, see rank | 7.29% | 7.29% |
| 15 to 19 years | 3,827 | 6.85%, see rank | 7.20% | 7.18% |
| 20 to 24 years | 3,839 | 6.88%, see rank | 6.85% | 6.74% |
| 25 to 34 years | 6,723 | 12.04%, see rank | 14.59% | 14.18% |
| 35 to 44 years | 8,068 | 14.45%, see rank | 15.97% | 16.04% |
| 45 to 54 years | 7,867 | 14.09%, see rank | 13.10% | 13.39% |
| 55 to 64 years | 5,598 | 10.03%, see rank | 8.38% | 8.63% |
| 65 to 74 years | 4,720 | 8.45%, see rank | 6.22% | 6.54% |
| 75 to 84 | 3,579 | 6.41%, see rank | 4.31% | 4.39% |
| 85 years and over | 1,481 | 2.65%, see rank | 1.55% | 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.
