Rock Island Population

1850–2026

36,034

2026 projection

2.9% since 2020 (decrease)

010K20K30K40K50K60K186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal 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 Rock Island. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202636,034-1910.53%
202536,225-180.05%
202436,243+1730.48%
202336,070-1060.29%
202236,176-3190.87%
202136,495-6131.65%
202037,108-1930.52%
201937,301-2380.63%
201837,539-3891.03%
201737,928-3390.89%

Showing 10 of 33 years.

The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.

Growth since 2020, compared

Rock Island has a population change lower than Rock Island County, Illinois, and the U.S.

  • United States+3.1%
  • Illinois−0.6%
  • Rock Island County−1.7%
  • Rock Island−2.1%

Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.

Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.

Rock Island Demographics

37.4median age

Median age

Female39.5 yrs
Male34.4 yrs

Adults

28,558
6,797 seniors (65+) · 24% of adults21,761 other adults

Sex

Female 50.2% · 18,142Male 49.8% · 18,009

Population by age

MaleFemale85+ years, male: 28985+ years, female: 64780–84 years, male: 28580–84 years, female: 47175–79 years, male: 48575–79 years, female: 52070–74 years, male: 92570–74 years, female: 1,01365–69 years, male: 86065–69 years, female: 1,30260–64 years, male: 1,33160–64 years, female: 1,20955–59 years, male: 1,00355–59 years, female: 91950–54 years, male: 87850–54 years, female: 91445–49 years, male: 83945–49 years, female: 1,00540–44 years, male: 1,13040–44 years, female: 98235–39 years, male: 79835–39 years, female: 1,00030–34 years, male: 1,04430–34 years, female: 1,02425–29 years, male: 1,24525–29 years, female: 1,01820–24 years, male: 1,89720–24 years, female: 1,67015–19 years, male: 1,72215–19 years, female: 1,69310–14 years, male: 1,15810–14 years, female: 1,0035–9 years, male: 1,0335–9 years, female: 8390–4 years, male: 1,0870–4 years, female: 91385+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K1.5K1.5K

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 362 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

Rock Island Income

$59,041median household income

Median household income

$59,041

Half of households earn more, half earn less

Median earnings

$44,556

Typical yearly pay for a worker 25 or older.

Poverty rate

21%

About 1 in 5 residents

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

Rock Island Marital Status

37% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married37%39%34%
Never married43%47%39%
Divorced11%10%12%
Widowed7%2%11%
Separated3%2%3%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources