Arlington, Washington demographics

Arlington, WA demographics: median age 36.6; 20.8% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Arlington city, Washington · Incorporated city · GEOID 5302585. The survey estimates a population of 21,095 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Arlington is 36.6 years, with a 90% margin of error of 1.7 years. There are 7,695 households (±408). 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	36.6 ±1.7	38.3 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 21,095
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Under 18	5,292 ±572	25.1% ±2.7 pp	21.4%	22.0%
18–34	4,603 ±538	21.8% ±2.6 pp	23.7%	22.8%
35–64	8,287 ±696	39.3% ±3.3 pp	38.3%	38.0%
65 and older	2,913 ±354	13.8% ±1.7 pp	16.6%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 21,095
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Male	10,655 ±452	50.5% ±2.1 pp	50.4%	49.5%
Female	10,440 ±449	49.5% ±2.1 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: 21,095
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
White alone	15,569 ±913	73.8% ±4.3 pp	65.8%	61.0%
Black or African American alone	296 ±182 · low precision	1.4% ±0.9 pp · low precision	4.0%	12.2%
American Indian and Alaska Native alone	40 ±34 · low precision	0.2% ±0.2 pp · low precision	1.2%	0.9%
Asian alone	1,135 ±447	5.4% ±2.1 pp	9.8%	6.0%
Native Hawaiian and Other Pacific Islander alone	38 ±43 · low precision	0.2% ±0.2 pp · low precision	0.7%	0.2%
Some other race alone	1,598 ±635	7.6% ±3.0 pp	5.8%	7.1%
Two or more races	2,419 ±485	11.5% ±2.3 pp	12.8%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 21,095
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Not Hispanic or Latino	17,727 ±743	84.0% ±3.5 pp	85.6%	80.7%
Hispanic or Latino	3,368 ±742	16.0% ±3.5 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: 7,695
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Married-couple family	3,772 ±264	49.0% ±2.2 pp	49.1%	46.9%
Other family: male householder, no spouse present	323 ±117	4.2% ±1.5 pp	4.8%	5.1%
Other family: female householder, no spouse present	1,003 ±244	13.0% ±3.1 pp	9.5%	12.2%
Nonfamily: householder living alone	2,026 ±382	26.3% ±4.8 pp	27.7%	28.7%
Nonfamily: householder not living alone	571 ±183	7.4% ±2.3 pp	8.9%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 7,695
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Households with people under 18	2,799 ±229	36.4% ±2.3 pp	29.3%	29.5%
Households without people under 18	4,896 ±486	63.6% ±5.3 pp	70.7%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 7,695
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
One-person nonfamily households	2,026 ±382	26.3% ±4.8 pp	27.7%	28.7%
Two-person households	2,213 ±314	28.8% ±3.8 pp	35.3%	33.8%
Three-person households	1,418 ±259	18.4% ±3.2 pp	15.1%	15.3%
Four-person households	1,097 ±213	14.3% ±2.7 pp	12.7%	12.6%
Five-person households	485 ±158	6.3% ±2.0 pp	5.6%	5.9%
Six-person households	254 ±105	3.3% ±1.4 pp	2.2%	2.2%
Seven or more people	202 ±89	2.6% ±1.2 pp	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: 21,095
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Native	18,770 ±629	89.0% ±3.0 pp	84.6%	85.9%
Foreign born	2,325 ±626	11.0% ±3.0 pp	15.4%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 19,913
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
English only	16,693 ±757	83.8% ±3.6 pp	78.6%	77.7%
Spanish	1,936 ±590	9.7% ±3.0 pp	9.0%	13.6%
French, Haitian, or Cajun	34 ±53 · low precision	0.2% ±0.3 pp · low precision	0.4%	0.7%
German or other West Germanic	81 ±58 · low precision	0.4% ±0.3 pp · low precision	0.4%	0.5%
Russian, Polish, or other Slavic	74 ±66 · low precision	0.4% ±0.3 pp · low precision	1.5%	0.7%
Other Indo-European	107 ±126 · low precision	0.5% ±0.6 pp · low precision	2.0%	2.0%
Korean	57 ±55 · low precision	0.3% ±0.3 pp · low precision	0.7%	0.3%
Chinese, including Mandarin and Cantonese	105 ±122 · low precision	0.5% ±0.6 pp · low precision	1.9%	1.1%
Vietnamese	200 ±223 · low precision	1.0% ±1.1 pp · low precision	1.0%	0.5%
Tagalog, including Filipino	297 ±191 · low precision	1.5% ±1.0 pp · low precision	0.9%	0.6%
Other Asian and Pacific Island	276 ±236 · low precision	1.4% ±1.2 pp · low precision	2.1%	1.1%
Arabic	0 ±25 · low precision	0.0% ±0.1 pp · low precision	0.4%	0.5%
Other and unspecified	53 ±65 · low precision	0.3% ±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: 13,710
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Less than high school graduate	1,234 ±337	9.0% ±2.4 pp	7.7%	10.4%
High school graduate or equivalency	4,289 ±487	31.3% ±3.3 pp	21.6%	26.0%
Some college, no degree	3,716 ±468	27.1% ±3.2 pp	21.0%	19.1%
Associate’s degree	1,616 ±310	11.8% ±2.2 pp	10.0%	8.8%
Bachelor’s degree	1,982 ±346	14.5% ±2.5 pp	24.0%	21.6%
Graduate or professional degree	873 ±196	6.4% ±1.4 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: 20,797
Category	Count ± MOE	Share ± MOE (pp)	Washington	U.S.
Same house	16,895 ±815	81.2% ±3.9 pp	85.5%	87.7%
Moved within same county	2,442 ±737	11.7% ±3.5 pp	8.0%	6.3%
Moved from a different county in the same state	597 ±249	2.9% ±1.2 pp	2.8%	3.1%
Moved from a different state	746 ±365	3.6% ±1.8 pp	2.9%	2.3%
Moved from abroad	117 ±90 · low precision	0.6% ±0.4 pp · low precision	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

6.6% of Arlington residents (±1.8 percentage points) had no health insurance coverage when surveyed, compared with 6.3% in Washington and 8.4% nationally. 91.7% 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	Arlington	Washington	U.S.	Compared with Washington
People without health insurance Civilian noninstitutionalized population	6.6% ±1.8 pp	6.3%	8.4%	Not statistically different
Households with a broadband subscription Households	91.7% ±2.5 pp	93.6%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	12.4% ±1.9 pp	7.8%	6.2%	Higher

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 Arlington . 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 Arlington housing and cost context or return to the city profile.