Cook County Historical Age Data
ACS 2010-2014 data
Total population: 5,227,827
Median Age (
see rank)
Cook County | 35.70 years old |
Illinois | 37.00 years old |
U.S. | 37.40 years old |
Median Age, Male (
see rank)
Cook County | 34.50 years old |
Illinois | 35.70 years old |
U.S. | 36.10 years old |
Median Age, Female (
see rank)
Cook County | 37.00 years old |
Illinois | 38.40 years old |
U.S. | 38.80 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 341,409 | 6.53%, see rank | 6.30% | 6.36% |
5 to 9 years | 329,506 | 6.30%, see rank | 6.58% | 6.51% |
10 to 14 years | 331,608 | 6.34%, see rank | 6.71% | 6.59% |
15 to 19 years | 343,171 | 6.56%, see rank | 6.94% | 6.85% |
20 to 24 years | 368,729 | 7.05%, see rank | 6.95% | 7.13% |
25 to 34 years | 845,482 | 16.17%, see rank | 13.84% | 13.47% |
35 to 44 years | 711,580 | 13.61%, see rank | 13.20% | 12.96% |
45 to 54 years | 703,663 | 13.46%, see rank | 14.17% | 14.09% |
55 to 64 years | 603,497 | 11.54%, see rank | 12.13% | 12.29% |
65 to 74 years | 350,529 | 6.71%, see rank | 7.18% | 7.64% |
75 to 84 | 202,676 | 3.88%, see rank | 4.10% | 4.25% |
85 years and over | 95,977 | 1.84%, see rank | 1.90% | 1.85% |
US Census 2010 data
Total population: 5,194,675
Median Age (
see rank)
Cook County | 35.30 years old |
Illinois | 36.60 years old |
U.S. | 37.20 years old |
Median Age, Male (
see rank)
Cook County | 34.00 years old |
Illinois | 35.20 years old |
U.S. | 35.80 years old |
Median Age, Female (
see rank)
Cook County | 36.60 years old |
Illinois | 37.90 years old |
U.S. | 38.50 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 342,493 | 6.59%, see rank | 6.51% | 6.54% |
5 to 9 years | 331,837 | 6.39%, see rank | 6.70% | 6.59% |
10 to 14 years | 339,576 | 6.54%, see rank | 6.85% | 6.70% |
15 to 19 years | 360,190 | 6.93%, see rank | 7.19% | 7.14% |
20 to 24 years | 372,503 | 7.17%, see rank | 6.85% | 6.99% |
25 to 34 years | 831,563 | 16.01%, see rank | 13.84% | 13.30% |
35 to 44 years | 709,795 | 13.66%, see rank | 13.45% | 13.30% |
45 to 54 years | 717,063 | 13.80%, see rank | 14.58% | 14.58% |
55 to 64 years | 569,326 | 10.96%, see rank | 11.48% | 11.82% |
65 to 74 years | 324,521 | 6.25%, see rank | 6.62% | 7.03% |
75 to 84 | 204,431 | 3.94%, see rank | 4.09% | 4.23% |
85 years and over | 91,377 | 1.76%, see rank | 1.83% | 1.78% |
ACS 2008-2012 data
Total population: 5,197,677
Median Age (
see rank)
Cook County | 35.30 years old |
Illinois | 36.60 years old |
U.S. | 37.20 years old |
Median Age, Male (
see rank)
Cook County | 34.00 years old |
Illinois | 35.30 years old |
U.S. | 35.80 years old |
Median Age, Female (
see rank)
Cook County | 36.60 years old |
Illinois | 38.00 years old |
U.S. | 38.50 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 343,239 | 6.60%, see rank | 6.50% | 6.51% |
5 to 9 years | 330,511 | 6.36%, see rank | 6.68% | 6.57% |
10 to 14 years | 339,402 | 6.53%, see rank | 6.82% | 6.68% |
15 to 19 years | 356,630 | 6.86%, see rank | 7.16% | 7.09% |
20 to 24 years | 371,078 | 7.14%, see rank | 6.88% | 7.04% |
25 to 34 years | 835,035 | 16.07%, see rank | 13.84% | 13.32% |
35 to 44 years | 711,506 | 13.69%, see rank | 13.49% | 13.34% |
45 to 54 years | 713,018 | 13.72%, see rank | 14.46% | 14.44% |
55 to 64 years | 571,496 | 11.00%, see rank | 11.52% | 11.84% |
65 to 74 years | 329,012 | 6.33%, see rank | 6.71% | 7.12% |
75 to 84 | 204,646 | 3.94%, see rank | 4.11% | 4.25% |
85 years and over | 92,104 | 1.77%, see rank | 1.83% | 1.78% |
ACS 2006-2010 data
Total population: 5,172,848
Median Age (
see rank)
Cook County | 35.10 years old |
Illinois | 36.20 years old |
U.S. | 36.90 years old |
Median Age, Male (
see rank)
Cook County | 33.70 years old |
Illinois | 34.90 years old |
U.S. | 35.60 years old |
Median Age, Female (
see rank)
Cook County | 36.40 years old |
Illinois | 37.60 years old |
U.S. | 38.10 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 345,277 | 6.67%, see rank | 6.63% | 6.62% |
5 to 9 years | 333,531 | 6.45%, see rank | 6.78% | 6.62% |
10 to 14 years | 346,656 | 6.70%, see rank | 6.94% | 6.79% |
15 to 19 years | 362,402 | 7.01%, see rank | 7.31% | 7.28% |
20 to 24 years | 371,081 | 7.17%, see rank | 6.86% | 6.98% |
25 to 34 years | 822,935 | 15.91%, see rank | 13.78% | 13.22% |
35 to 44 years | 722,183 | 13.96%, see rank | 13.96% | 13.89% |
45 to 54 years | 717,076 | 13.86%, see rank | 14.55% | 14.57% |
55 to 64 years | 539,438 | 10.43%, see rank | 10.89% | 11.28% |
65 to 74 years | 314,784 | 6.09%, see rank | 6.36% | 6.74% |
75 to 84 | 209,986 | 4.06%, see rank | 4.17% | 4.30% |
85 years and over | 87,499 | 1.69%, see rank | 1.77% | 1.70% |
ACS 2005-2009 data
Total population: 5,257,001
Median Age (
see rank)
Cook County | 34.70 years old |
Illinois | 35.90 years old |
U.S. | 36.50 years old |
Median Age, Male (
see rank)
Cook County | 33.40 years old |
Illinois | 34.60 years old |
U.S. | 35.20 years old |
Median Age, Female (
see rank)
Cook County | 36.00 years old |
Illinois | 37.20 years old |
U.S. | 37.90 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 381,775 | 7.26%, see rank | 6.97% | 6.92% |
5 to 9 years | 342,157 | 6.51%, see rank | 6.76% | 6.59% |
10 to 14 years | 356,613 | 6.78%, see rank | 6.96% | 6.83% |
15 to 19 years | 358,910 | 6.83%, see rank | 7.24% | 7.15% |
20 to 24 years | 362,409 | 6.89%, see rank | 7.08% | 7.02% |
25 to 34 years | 848,955 | 16.15%, see rank | 13.73% | 13.42% |
35 to 44 years | 744,730 | 14.17%, see rank | 14.23% | 14.18% |
45 to 54 years | 723,842 | 13.77%, see rank | 14.47% | 14.48% |
55 to 64 years | 523,744 | 9.96%, see rank | 10.43% | 10.81% |
65 to 74 years | 313,589 | 5.97%, see rank | 6.21% | 6.50% |
75 to 84 | 214,495 | 4.08%, see rank | 4.17% | 4.40% |
85 years and over | 85,782 | 1.63%, see rank | 1.74% | 1.71% |
US Census 2000 data
Total population: 5,376,741
Median Age (
see rank)
Cook County | 33.60 years old |
Illinois | 34.70 years old |
U.S. | 35.30 years old |
Median Age, Male (
see rank)
Cook County | 32.20 years old |
Illinois | 33.30 years old |
U.S. | 34.00 years old |
Median Age, Female (
see rank)
Cook County | 35.10 years old |
Illinois | 36.00 years old |
U.S. | 36.50 years old |
| Cook County | % of the Total Population | Illinois | U.S. |
Under 5 years | 388,201 | 7.22%, see rank | 7.06% | 6.81% |
5 to 9 years | 406,508 | 7.56%, see rank | 7.49% | 7.30% |
10 to 14 years | 380,589 | 7.08%, see rank | 7.29% | 7.29% |
15 to 19 years | 368,175 | 6.85%, see rank | 7.20% | 7.18% |
20 to 24 years | 385,321 | 7.17%, see rank | 6.85% | 6.74% |
25 to 34 years | 872,824 | 16.23%, see rank | 14.59% | 14.18% |
35 to 44 years | 832,847 | 15.49%, see rank | 15.97% | 16.04% |
45 to 54 years | 673,290 | 12.52%, see rank | 13.10% | 13.39% |
55 to 64 years | 438,721 | 8.16%, see rank | 8.38% | 8.63% |
65 to 74 years | 328,628 | 6.11%, see rank | 6.22% | 6.54% |
75 to 84 | 225,117 | 4.19%, see rank | 4.31% | 4.39% |
85 years and over | 76,520 | 1.42%, 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.