Grundy County Historical Age Data
ACS 2010-2014 data
Total population: 50,173
Median Age (
see rank)
| Grundy County | 36.80 years old |
| Illinois | 37.00 years old |
| U.S. | 37.40 years old |
Median Age, Male (
see rank)
| Grundy County | 36.10 years old |
| Illinois | 35.70 years old |
| U.S. | 36.10 years old |
Median Age, Female (
see rank)
| Grundy County | 37.80 years old |
| Illinois | 38.40 years old |
| U.S. | 38.80 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,391 | 6.76%, see rank | 6.30% | 6.36% |
| 5 to 9 years | 3,992 | 7.96%, see rank | 6.58% | 6.51% |
| 10 to 14 years | 3,660 | 7.29%, see rank | 6.71% | 6.59% |
| 15 to 19 years | 3,483 | 6.94%, see rank | 6.94% | 6.85% |
| 20 to 24 years | 2,797 | 5.57%, see rank | 6.95% | 7.13% |
| 25 to 34 years | 6,571 | 13.10%, see rank | 13.84% | 13.47% |
| 35 to 44 years | 7,274 | 14.50%, see rank | 13.20% | 12.96% |
| 45 to 54 years | 7,126 | 14.20%, see rank | 14.17% | 14.09% |
| 55 to 64 years | 5,830 | 11.62%, see rank | 12.13% | 12.29% |
| 65 to 74 years | 3,577 | 7.13%, see rank | 7.18% | 7.64% |
| 75 to 84 | 1,721 | 3.43%, see rank | 4.10% | 4.25% |
| 85 years and over | 751 | 1.50%, see rank | 1.90% | 1.85% |
US Census 2010 data
Total population: 50,063
Median Age (
see rank)
| Grundy County | 36.10 years old |
| Illinois | 36.60 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Grundy County | 35.40 years old |
| Illinois | 35.20 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Grundy County | 36.70 years old |
| Illinois | 37.90 years old |
| U.S. | 38.50 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,638 | 7.27%, see rank | 6.51% | 6.54% |
| 5 to 9 years | 3,889 | 7.77%, see rank | 6.70% | 6.59% |
| 10 to 14 years | 3,839 | 7.67%, see rank | 6.85% | 6.70% |
| 15 to 19 years | 3,541 | 7.07%, see rank | 7.19% | 7.14% |
| 20 to 24 years | 2,567 | 5.13%, see rank | 6.85% | 6.99% |
| 25 to 34 years | 6,804 | 13.59%, see rank | 13.84% | 13.30% |
| 35 to 44 years | 7,361 | 14.70%, see rank | 13.45% | 13.30% |
| 45 to 54 years | 7,386 | 14.75%, see rank | 14.58% | 14.58% |
| 55 to 64 years | 5,492 | 10.97%, see rank | 11.48% | 11.82% |
| 65 to 74 years | 3,117 | 6.23%, see rank | 6.62% | 7.03% |
| 75 to 84 | 1,661 | 3.32%, see rank | 4.09% | 4.23% |
| 85 years and over | 768 | 1.53%, see rank | 1.83% | 1.78% |
ACS 2008-2012 data
Total population: 49,870
Median Age (
see rank)
| Grundy County | 36.40 years old |
| Illinois | 36.60 years old |
| U.S. | 37.20 years old |
Median Age, Male (
see rank)
| Grundy County | 35.70 years old |
| Illinois | 35.30 years old |
| U.S. | 35.80 years old |
Median Age, Female (
see rank)
| Grundy County | 37.30 years old |
| Illinois | 38.00 years old |
| U.S. | 38.50 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,604 | 7.23%, see rank | 6.50% | 6.51% |
| 5 to 9 years | 3,936 | 7.89%, see rank | 6.68% | 6.57% |
| 10 to 14 years | 3,677 | 7.37%, see rank | 6.82% | 6.68% |
| 15 to 19 years | 3,536 | 7.09%, see rank | 7.16% | 7.09% |
| 20 to 24 years | 2,677 | 5.37%, see rank | 6.88% | 7.04% |
| 25 to 34 years | 6,713 | 13.46%, see rank | 13.84% | 13.32% |
| 35 to 44 years | 7,248 | 14.53%, see rank | 13.49% | 13.34% |
| 45 to 54 years | 7,374 | 14.79%, see rank | 14.46% | 14.44% |
| 55 to 64 years | 5,527 | 11.08%, see rank | 11.52% | 11.84% |
| 65 to 74 years | 3,186 | 6.39%, see rank | 6.71% | 7.12% |
| 75 to 84 | 1,665 | 3.34%, see rank | 4.11% | 4.25% |
| 85 years and over | 727 | 1.46%, see rank | 1.83% | 1.78% |
ACS 2006-2010 data
Total population: 48,744
Median Age (
see rank)
| Grundy County | 36.20 years old |
| Illinois | 36.20 years old |
| U.S. | 36.90 years old |
Median Age, Male (
see rank)
| Grundy County | 35.10 years old |
| Illinois | 34.90 years old |
| U.S. | 35.60 years old |
Median Age, Female (
see rank)
| Grundy County | 37.20 years old |
| Illinois | 37.60 years old |
| U.S. | 38.10 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,552 | 7.29%, see rank | 6.63% | 6.62% |
| 5 to 9 years | 3,669 | 7.53%, see rank | 6.78% | 6.62% |
| 10 to 14 years | 3,731 | 7.65%, see rank | 6.94% | 6.79% |
| 15 to 19 years | 3,513 | 7.21%, see rank | 7.31% | 7.28% |
| 20 to 24 years | 2,619 | 5.37%, see rank | 6.86% | 6.98% |
| 25 to 34 years | 6,653 | 13.65%, see rank | 13.78% | 13.22% |
| 35 to 44 years | 7,293 | 14.96%, see rank | 13.96% | 13.89% |
| 45 to 54 years | 7,315 | 15.01%, see rank | 14.55% | 14.57% |
| 55 to 64 years | 5,103 | 10.47%, see rank | 10.89% | 11.28% |
| 65 to 74 years | 2,916 | 5.98%, see rank | 6.36% | 6.74% |
| 75 to 84 | 1,629 | 3.34%, see rank | 4.17% | 4.30% |
| 85 years and over | 751 | 1.54%, see rank | 1.77% | 1.70% |
ACS 2005-2009 data
Total population: 46,513
Median Age (
see rank)
| Grundy County | 36.00 years old |
| Illinois | 35.90 years old |
| U.S. | 36.50 years old |
Median Age, Male (
see rank)
| Grundy County | 34.70 years old |
| Illinois | 34.60 years old |
| U.S. | 35.20 years old |
Median Age, Female (
see rank)
| Grundy County | 37.30 years old |
| Illinois | 37.20 years old |
| U.S. | 37.90 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 3,499 | 7.52%, see rank | 6.97% | 6.92% |
| 5 to 9 years | 3,252 | 6.99%, see rank | 6.76% | 6.59% |
| 10 to 14 years | 3,606 | 7.75%, see rank | 6.96% | 6.83% |
| 15 to 19 years | 3,258 | 7.00%, see rank | 7.24% | 7.15% |
| 20 to 24 years | 2,755 | 5.92%, see rank | 7.08% | 7.02% |
| 25 to 34 years | 6,355 | 13.66%, see rank | 13.73% | 13.42% |
| 35 to 44 years | 6,974 | 14.99%, see rank | 14.23% | 14.18% |
| 45 to 54 years | 7,005 | 15.06%, see rank | 14.47% | 14.48% |
| 55 to 64 years | 4,656 | 10.01%, see rank | 10.43% | 10.81% |
| 65 to 74 years | 2,694 | 5.79%, see rank | 6.21% | 6.50% |
| 75 to 84 | 1,790 | 3.85%, see rank | 4.17% | 4.40% |
| 85 years and over | 669 | 1.44%, see rank | 1.74% | 1.71% |
US Census 2000 data
Total population: 37,535
Median Age (
see rank)
| Grundy County | 36.30 years old |
| Illinois | 34.70 years old |
| U.S. | 35.30 years old |
Median Age, Male (
see rank)
| Grundy County | 35.40 years old |
| Illinois | 33.30 years old |
| U.S. | 34.00 years old |
Median Age, Female (
see rank)
| Grundy County | 37.20 years old |
| Illinois | 36.00 years old |
| U.S. | 36.50 years old |
| | Grundy County | % of the Total Population | Illinois | U.S. |
| Under 5 years | 2,493 | 6.64%, see rank | 7.06% | 6.81% |
| 5 to 9 years | 2,751 | 7.33%, see rank | 7.49% | 7.30% |
| 10 to 14 years | 2,928 | 7.80%, see rank | 7.29% | 7.29% |
| 15 to 19 years | 2,843 | 7.57%, see rank | 7.20% | 7.18% |
| 20 to 24 years | 2,113 | 5.63%, see rank | 6.85% | 6.74% |
| 25 to 34 years | 4,912 | 13.09%, see rank | 14.59% | 14.18% |
| 35 to 44 years | 6,433 | 17.14%, see rank | 15.97% | 16.04% |
| 45 to 54 years | 5,174 | 13.78%, see rank | 13.10% | 13.39% |
| 55 to 64 years | 3,281 | 8.74%, see rank | 8.38% | 8.63% |
| 65 to 74 years | 2,292 | 6.11%, see rank | 6.22% | 6.54% |
| 75 to 84 | 1,698 | 4.52%, see rank | 4.31% | 4.39% |
| 85 years and over | 617 | 1.64%, 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.
