Cook County Population

1840–2026

5.2M

2026 projection

1.2% since 2020 (decrease)

01M2M3M4M5M6M1840186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Cook County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
20265,200,459+5,8340.11%
20255,194,625+5,8340.11%
20245,188,791+45,9380.89%
20235,142,853+14,9870.29%
20225,127,866-58,3831.13%
20215,186,249-77,4021.47%
20205,263,651+118,3252.30%
20195,145,326-25,6810.50%
20185,171,007-28,5750.55%
20175,199,582-23,8040.46%

Showing 10 of 33 years.

Cook County Demographics

38median age

Median age

Female39 yrs
Male37 yrs

Adults

4,089,888
827,156 seniors (65+) · 20% of adults3,262,732 other adults

Sex

Female 51.2% · 2,653,202Male 48.8% · 2,528,888

Population by age

MaleFemale85+ years, male: 35,84685+ years, female: 66,99080–84 years, male: 38,12780–84 years, female: 55,26075–79 years, male: 60,76175–79 years, female: 82,98270–74 years, male: 98,33670–74 years, female: 117,62165–69 years, male: 125,10365–69 years, female: 146,13060–64 years, male: 149,49960–64 years, female: 166,14055–59 years, male: 155,59755–59 years, female: 157,05050–54 years, male: 158,85750–54 years, female: 162,31645–49 years, male: 158,34045–49 years, female: 161,44440–44 years, male: 170,58040–44 years, female: 174,16735–39 years, male: 191,26535–39 years, female: 188,21330–34 years, male: 206,55730–34 years, female: 206,48525–29 years, male: 201,12425–29 years, female: 206,74420–24 years, male: 159,77520–24 years, female: 165,15215–19 years, male: 162,03415–19 years, female: 157,46110–14 years, male: 159,88610–14 years, female: 153,7615–9 years, male: 154,2455–9 years, female: 147,7220–4 years, male: 142,9560–4 years, female: 137,56485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–4100K100K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 51,821 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Cook County Income

$83,498median household income

Median household income

$83,498

Half of households earn more, half earn less

Median earnings

$57,379

Typical yearly pay for a worker 25 or older.

Poverty rate

13.5%

About 1 in 7 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Cook County Marital Status

42% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married42%44%40%
Never married42%44%41%
Divorced8%7%10%
Widowed5%3%8%
Separated2%2%2%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year