Sioux City Population

1870–2026

86,493

2026 projection

0.8% since 2020 (increase)

020K40K60K80K100K18801900192019401960198020002020

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 Sioux City. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202686,493+1370.16%
202586,356-880.10%
202486,444+1870.22%
202386,257+6580.77%
202285,599-3070.36%
202185,906+1090.13%
202085,797+2880.34%
201985,509+6870.81%
201884,822+3960.47%
201784,426-2070.24%

Showing 10 of 31 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

Sioux City is growing about as fast as Woodbury County, and slower than Iowa and the U.S.

  • United States+3.1%
  • Iowa+1.5%
  • Woodbury County+0.7%
  • Sioux City+0.5%

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.

Sioux City Demographics

34.9median age

Median age

Female36 yrs
Male33.7 yrs

Adults

63,655
12,804 seniors (65+) · 20% of adults50,851 other adults

Sex

Female 49.7% · 42,825Male 50.3% · 43,276

Population by age

MaleFemale85+ years, male: 41285+ years, female: 82380–84 years, male: 67680–84 years, female: 1,07275–79 years, male: 89875–79 years, female: 1,21070–74 years, male: 1,47470–74 years, female: 1,86865–69 years, male: 2,22765–69 years, female: 2,14460–64 years, male: 2,61860–64 years, female: 2,60455–59 years, male: 2,05355–59 years, female: 2,18050–54 years, male: 2,48250–54 years, female: 2,25345–49 years, male: 2,53245–49 years, female: 2,53140–44 years, male: 3,22740–44 years, female: 2,85635–39 years, male: 2,30135–39 years, female: 2,54130–34 years, male: 2,76430–34 years, female: 2,60425–29 years, male: 2,96325–29 years, female: 2,80220–24 years, male: 3,40320–24 years, female: 3,25315–19 years, male: 3,65515–19 years, female: 3,10410–14 years, male: 3,49610–14 years, female: 2,8925–9 years, male: 2,8295–9 years, female: 3,1700–4 years, male: 3,2660–4 years, female: 2,91885+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K3K3K

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 861 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

Sioux City Income

$68,906median household income

Median household income

$68,906

Half of households earn more, half earn less

Median earnings

$47,353

Typical yearly pay for a worker 25 or older.

Poverty rate

15.3%

About 1 in 7 residents

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

Sioux City Marital Status

43% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married43%45%41%
Never married39%43%36%
Divorced11%9%14%
Widowed5%3%8%
Separated2%2%2%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources