Rock Island Flag

Rock Island

County Seat:
Yes
Area (mi²):
17.535
State:
Illinois

Rock Island is a city located in Rock Island County, Illinois. Rock Island has a 2026 population of 36,146. It is also the county seat of Rock Island County. Rock Island is currently declining at a rate of -0.4% annually and its population has decreased by -2.33% since the most recent census, which recorded a population of 37,010 in 2020.

The median household income in Rock Island is $59,041 with a poverty rate of 21%. The median age in Rock Island is 37.4 years: 34.4 years for males, and 39.5 years for females. For every 100 females there are 99.3 males.

36.1K
Total Population
2,061
Density (mi²)
-144 -0.4%
Growth

Rock Island Population

Rock Island Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202636,146-144-0.4%
202536,290-144-0.4%
202436,4341380.38%
202336,296-26-0.07%
202236,322-265-0.72%
202136,587-423-1.14%
202037,010-93-0.25%
201937,152-257-0.69%
201837,409-403-1.07%
201737,812-356-0.93%
201638,168-377-0.98%
201538,545-245-0.63%
201438,790-111-0.29%
201338,901-35-0.09%
201238,936-44-0.11%
201138,98070.02%
201038,973-45-0.12%
200039,684-868-2.14%
199040,552-6,269-13.39%
198046,821-3,345-6.67%
197050,166-1,697-3.27%
196051,8633,1536.47%
195048,7105,93513.87%
194042,7754,82212.71%
193037,9532,7767.89%
192035,17710,84244.55%
191024,3354,84224.84%
190019,4935,85942.97%
189013,6341,97516.94%
188011,6593,76947.77%
18707,8902,76053.8%
18605,13000%

Median Age

Overall: 37.4 years
Female: 39.5 years
Male: 34.4 years

Rock Island Adults

There are 28,558 adults, (6,797 of whom are seniors) in Rock Island.

Sex Ratio

Female: 18,142 (50.2%)
Male: 18,009 (49.8%)

Demographics

The racial composition of Rock Island includes 65.02% White, 17.22% Black or African American, 4.18% other race, 3.76% Asian, and smaller percentages for Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White23,50765.02%
Black or African American6,22717.22%
Two or more races3,2328.94%
Other race1,5104.18%
Asian1,3593.76%
Native Hawaiian or Pacific Islander1640.45%
Native American1520.42%
Race
Population ↓
Percentage (of total)
Two or more races1,6924.68%
Other race1,3573.75%
White9052.5%
Black or African American5841.62%
Native Hawaiian or Pacific Islander1640.45%
Native American1040.29%
Race
Population ↓
Percentage (of total)
White22,60262.52%
Black or African American5,64315.61%
Two or more races1,5404.26%
Asian1,3593.76%
Other race1530.42%
Native American480.13%

Rock Island Marital Status

Economics and Income Statistics

Rock Island 's average per capita income is $44,556. Household income levels show a median of $59,041. The poverty rate stands at 21%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$96,812-
Families$78,117$103,060
Households$59,041$79,834
Non Families$37,944$50,954

$44,556

Average Income

$59,041

Median Household Income

21%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)