Issaquah Population

1900–2026

39,227

2026 projection

2.1% since 2020 (decrease)

010K20K30K40K50K1900192019401960198020002020

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 Issaquah. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202639,227-1960.50%
202539,423+1190.30%
202439,304+1930.49%
202339,111-1380.35%
202239,249-3010.76%
202139,550-5011.25%
202040,051+1940.49%
201939,857+2630.66%
201839,594+1,5554.09%
201738,039+3740.99%

Showing 10 of 28 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

Issaquah has a population change lower than King County, Washington, and the U.S.

  • Washington+3.5%
  • King County+3.1%
  • United States+3.1%
  • Issaquah−1.7%

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.

Issaquah Demographics

37.5median age

Median age

Female37.3 yrs
Male37.7 yrs

Adults

31,373
5,744 seniors (65+) · 18% of adults25,629 other adults

Sex

Female 51.5% · 20,409Male 48.5% · 19,182

Population by age

MaleFemale85+ years, male: 38085+ years, female: 46680–84 years, male: 27080–84 years, female: 49075–79 years, male: 56375–79 years, female: 84070–74 years, male: 45470–74 years, female: 81665–69 years, male: 71865–69 years, female: 74760–64 years, male: 44760–64 years, female: 62355–59 years, male: 1,26155–59 years, female: 87150–54 years, male: 1,50450–54 years, female: 1,57145–49 years, male: 1,60545–49 years, female: 1,28640–44 years, male: 1,55340–44 years, female: 1,53835–39 years, male: 2,29435–39 years, female: 1,87830–34 years, male: 2,02330–34 years, female: 2,37725–29 years, male: 1,44925–29 years, female: 1,34520–24 years, male: 53320–24 years, female: 78715–19 years, male: 1,02915–19 years, female: 1,26610–14 years, male: 92810–14 years, female: 1,3565–9 years, male: 1,3935–9 years, female: 1,1660–4 years, male: 7780–4 years, female: 98685+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K

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 396 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

Issaquah Income

$154,669median household income

Median household income

$154,669

Half of households earn more, half earn less

Median earnings

$105,859

Typical yearly pay for a worker 25 or older.

Poverty rate

5.2%

About 1 in 19 residents

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

Issaquah Marital Status

59% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married59%62%56%
Never married29%29%29%
Divorced8%8%9%
Widowed4%2%6%
Separated<1%<1%<1%

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

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources