Sammamish, Washington demographics

Sammamish, WA demographics: median age 39.9; 77.1% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Sammamish city, Washington · Incorporated city · GEOID 5361115. The survey estimates a population of 66,463 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Sammamish is 39.9 years, with a 90% margin of error of 0.6 years. There are 22,144 households (±430). 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	39.9 ±0.6	38.3 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 66,463
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Under 18	19,031 ±997	28.6% ±1.5 pp	21.4%	22.0%
18–34	9,063 ±821	13.6% ±1.2 pp	23.7%	22.8%
35–64	32,321 ±1,233	48.6% ±1.9 pp	38.3%	38.0%
65 and older	6,048 ±522	9.1% ±0.8 pp	16.6%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 66,463
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Male	32,561 ±699	49.0% ±1.1 pp	50.4%	49.5%
Female	33,902 ±701	51.0% ±1.1 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: 66,463
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
White alone	33,838 ±1,441	50.9% ±2.2 pp	65.8%	61.0%
Black or African American alone	885 ±422	1.3% ±0.6 pp	4.0%	12.2%
American Indian and Alaska Native alone	233 ±181 · low precision	0.4% ±0.3 pp · low precision	1.2%	0.9%
Asian alone	24,724 ±1,402	37.2% ±2.1 pp	9.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	50 ±41 · low precision	0.1% ±0.1 pp · low precision	0.7%	0.2%
Some other race alone	517 ±171	0.8% ±0.3 pp	5.8%	7.1%
Two or more races	6,216 ±810	9.4% ±1.2 pp	12.8%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 66,463
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Not Hispanic or Latino	62,734 ±814	94.4% ±1.2 pp	85.6%	80.7%
Hispanic or Latino	3,729 ±813	5.6% ±1.2 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: 22,144
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Married-couple family	17,461 ±456	78.9% ±1.4 pp	49.1%	46.9%
Other family: male householder, no spouse present	388 ±182	1.8% ±0.8 pp	4.8%	5.1%
Other family: female householder, no spouse present	1,347 ±414	6.1% ±1.9 pp	9.5%	12.2%
Nonfamily: householder living alone	2,129 ±303	9.6% ±1.4 pp	27.7%	28.7%
Nonfamily: householder not living alone	819 ±273	3.7% ±1.2 pp	8.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 22,144
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Households with people under 18	11,307 ±460	51.1% ±1.8 pp	29.3%	29.5%
Households without people under 18	10,837 ±597	48.9% ±2.5 pp	70.7%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 22,144
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
One-person nonfamily households	2,129 ±303	9.6% ±1.4 pp	27.7%	28.7%
Two-person households	6,914 ±678	31.2% ±3.0 pp	35.3%	33.8%
Three-person households	4,905 ±532	22.2% ±2.4 pp	15.1%	15.3%
Four-person households	5,916 ±483	26.7% ±2.1 pp	12.7%	12.6%
Five-person households	1,730 ±378	7.8% ±1.7 pp	5.6%	5.9%
Six-person households	440 ±122	2.0% ±0.6 pp	2.2%	2.2%
Seven or more people	110 ±74 · low precision	0.5% ±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: 66,463
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Native	42,236 ±1,435	63.5% ±2.2 pp	84.6%	85.9%
Foreign born	24,227 ±1,431	36.5% ±2.2 pp	15.4%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 63,015
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
English only	38,295 ±1,502	60.8% ±2.4 pp	78.6%	77.7%
Spanish	2,067 ±714	3.3% ±1.1 pp	9.0%	13.6%
French, Haitian, or Cajun	303 ±179 · low precision	0.5% ±0.3 pp · low precision	0.4%	0.7%
German or other West Germanic	199 ±95	0.3% ±0.2 pp	0.4%	0.5%
Russian, Polish, or other Slavic	1,648 ±492	2.6% ±0.8 pp	1.5%	0.7%
Other Indo-European	5,944 ±752	9.4% ±1.2 pp	2.0%	2.0%
Korean	1,148 ±410	1.8% ±0.7 pp	0.7%	0.3%
Chinese, including Mandarin and Cantonese	6,471 ±857	10.3% ±1.4 pp	1.9%	1.1%
Vietnamese	224 ±142 · low precision	0.4% ±0.2 pp · low precision	1.0%	0.5%
Tagalog, including Filipino	173 ±107 · low precision	0.3% ±0.2 pp · low precision	0.9%	0.6%
Other Asian and Pacific Island	5,720 ±1,305	9.1% ±2.1 pp	2.1%	1.1%
Arabic	222 ±136 · low precision	0.4% ±0.2 pp · low precision	0.4%	0.5%
Other and unspecified	601 ±507 · low precision	1.0% ±0.8 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: 43,412
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Less than high school graduate	1,084 ±286	2.5% ±0.7 pp	7.7%	10.4%
High school graduate or equivalency	2,310 ±515	5.3% ±1.2 pp	21.6%	26.0%
Some college, no degree	4,268 ±702	9.8% ±1.6 pp	21.0%	19.1%
Associate’s degree	2,295 ±495	5.3% ±1.1 pp	10.0%	8.8%
Bachelor’s degree	17,250 ±943	39.7% ±2.1 pp	24.0%	21.6%
Graduate or professional degree	16,205 ±827	37.3% ±1.8 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: 65,915
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Same house	59,703 ±942	90.6% ±1.4 pp	85.5%	87.7%
Moved within same county	3,352 ±603	5.1% ±0.9 pp	8.0%	6.3%
Moved from a different county in the same state	351 ±143	0.5% ±0.2 pp	2.8%	3.1%
Moved from a different state	1,300 ±505	2.0% ±0.8 pp	2.9%	2.3%
Moved from abroad	1,209 ±327	1.8% ±0.5 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

2.3% of Sammamish residents (±0.8 percentage points) had no health insurance coverage when surveyed, compared with 6.3% in Washington and 8.4% nationally. 99.1% 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	Sammamish	Washington	U.S.	Compared with Washington
People without health insurance Civilian noninstitutionalized population	2.3% ±0.8 pp	6.3%	8.4%	Lower
Households with a broadband subscription Households	99.1% ±0.2 pp	93.6%	91.0%	Higher
Veterans Civilian population age 18 and older	2.2% ±0.4 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 Sammamish . 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 Sammamish housing and cost context or return to the city profile.