Issaquah, Washington demographics

Issaquah, WA demographics: median age 37.5; 70.5% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Issaquah city, Washington · Incorporated city · GEOID 5333805. The survey estimates a population of 39,591 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Issaquah is 37.5 years, with a 90% margin of error of 0.7 years. There are 16,664 households (±508). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	37.5 ±0.7	38.3 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 39,591
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Under 18	8,218 ±744	20.8% ±1.9 pp	21.4%	22.0%
18–34	9,198 ±898	23.2% ±2.3 pp	23.7%	22.8%
35–64	16,431 ±1,054	41.5% ±2.7 pp	38.3%	38.0%
65 and older	5,744 ±510	14.5% ±1.3 pp	16.6%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 39,591
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Male	19,182 ±618	48.5% ±1.6 pp	50.4%	49.5%
Female	20,409 ±616	51.5% ±1.6 pp	49.6%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 39,591
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
White alone	22,707 ±1,237	57.4% ±3.1 pp	65.8%	61.0%
Black or African American alone	899 ±546 · low precision	2.3% ±1.4 pp · low precision	4.0%	12.2%
American Indian and Alaska Native alone	139 ±93 · low precision	0.4% ±0.2 pp · low precision	1.2%	0.9%
Asian alone	10,605 ±1,346	26.8% ±3.4 pp	9.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	133 ±175 · low precision	0.3% ±0.4 pp · low precision	0.7%	0.2%
Some other race alone	1,080 ±365	2.7% ±0.9 pp	5.8%	7.1%
Two or more races	4,028 ±762	10.2% ±1.9 pp	12.8%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 39,591
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Not Hispanic or Latino	37,347 ±546	94.3% ±1.4 pp	85.6%	80.7%
Hispanic or Latino	2,244 ±549	5.7% ±1.4 pp	14.4%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 16,664
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Married-couple family	9,277 ±473	55.7% ±2.3 pp	49.1%	46.9%
Other family: male householder, no spouse present	474 ±185	2.8% ±1.1 pp	4.8%	5.1%
Other family: female householder, no spouse present	1,072 ±273	6.4% ±1.6 pp	9.5%	12.2%
Nonfamily: householder living alone	4,265 ±664	25.6% ±3.9 pp	27.7%	28.7%
Nonfamily: householder not living alone	1,576 ±397	9.5% ±2.4 pp	8.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 16,664
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Households with people under 18	4,979 ±348	29.9% ±1.9 pp	29.3%	29.5%
Households without people under 18	11,685 ±697	70.1% ±3.6 pp	70.7%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 16,664
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
One-person nonfamily households	4,265 ±664	25.6% ±3.9 pp	27.7%	28.7%
Two-person households	7,010 ±677	42.1% ±3.9 pp	35.3%	33.8%
Three-person households	2,150 ±339	12.9% ±2.0 pp	15.1%	15.3%
Four-person households	2,295 ±350	13.8% ±2.1 pp	12.7%	12.6%
Five-person households	752 ±162	4.5% ±1.0 pp	5.6%	5.9%
Six-person households	180 ±89	1.1% ±0.5 pp	2.2%	2.2%
Seven or more people	12 ±43 · low precision	0.1% ±0.3 pp · low precision	1.5%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 39,591
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Native	28,398 ±1,152	71.7% ±2.9 pp	84.6%	85.9%
Foreign born	11,193 ±1,141	28.3% ±2.9 pp	15.4%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 37,827
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
English only	26,017 ±1,112	68.8% ±2.9 pp	78.6%	77.7%
Spanish	1,277 ±440	3.4% ±1.2 pp	9.0%	13.6%
French, Haitian, or Cajun	123 ±123 · low precision	0.3% ±0.3 pp · low precision	0.4%	0.7%
German or other West Germanic	142 ±107 · low precision	0.4% ±0.3 pp · low precision	0.4%	0.5%
Russian, Polish, or other Slavic	1,232 ±440	3.3% ±1.2 pp	1.5%	0.7%
Other Indo-European	2,329 ±618	6.2% ±1.6 pp	2.0%	2.0%
Korean	808 ±354	2.1% ±0.9 pp	0.7%	0.3%
Chinese, including Mandarin and Cantonese	3,003 ±669	7.9% ±1.8 pp	1.9%	1.1%
Vietnamese	307 ±332 · low precision	0.8% ±0.9 pp · low precision	1.0%	0.5%
Tagalog, including Filipino	301 ±161 · low precision	0.8% ±0.4 pp · low precision	0.9%	0.6%
Other Asian and Pacific Island	1,799 ±921 · low precision	4.8% ±2.4 pp · low precision	2.1%	1.1%
Arabic	412 ±378 · low precision	1.1% ±1.0 pp · low precision	0.4%	0.5%
Other and unspecified	77 ±129 · low precision	0.2% ±0.3 pp · low precision	1.1%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 29,369
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Less than high school graduate	585 ±292	2.0% ±1.0 pp	7.7%	10.4%
High school graduate or equivalency	2,029 ±420	6.9% ±1.4 pp	21.6%	26.0%
Some college, no degree	3,926 ±585	13.4% ±2.0 pp	21.0%	19.1%
Associate’s degree	2,137 ±381	7.3% ±1.3 pp	10.0%	8.8%
Bachelor’s degree	11,378 ±980	38.7% ±3.2 pp	24.0%	21.6%
Graduate or professional degree	9,314 ±840	31.7% ±2.8 pp	15.6%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 39,419
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Same house	32,280 ±1,007	81.9% ±2.5 pp	85.5%	87.7%
Moved within same county	4,365 ±878	11.1% ±2.2 pp	8.0%	6.3%
Moved from a different county in the same state	409 ±170	1.0% ±0.4 pp	2.8%	3.1%
Moved from a different state	1,881 ±543	4.8% ±1.4 pp	2.9%	2.3%
Moved from abroad	484 ±236	1.2% ±0.6 pp	0.8%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

1.7% of Issaquah residents (±0.5 percentage points) had no health insurance coverage when surveyed, compared with 6.3% in Washington and 8.4% nationally. 96.8% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Issaquah	Washington	U.S.	Compared with Washington
People without health insurance Civilian noninstitutionalized population	1.7% ±0.5 pp	6.3%	8.4%	Lower
Households with a broadband subscription Households	96.8% ±1.4 pp	93.6%	91.0%	Higher
Veterans Civilian population age 18 and older	5.3% ±1.0 pp	7.8%	6.2%	Lower

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Issaquah . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Issaquah housing and cost context or return to the city profile.