City in Snohomish County, Washington · 10 sq mi · 2,256 people per sq mi
22,490 people live in Arlington. The typical household earns $88,231, and the median resident is 36.6 years old.
2026 projection
From 19,868 in 2020
Poverty rate 12.68%
Men 35.5 · Women 38.2
1910–2026
22,490
2026 projection
13.2% since 2020 (increase)
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.
1910–2026
22,490
2026 projection
13.2% since 2020 (increase)
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.
| 2026 | 22,490 | +459 | 2.08% |
|---|---|---|---|
| 2025 | 22,031 | +138 | 0.63% |
| 2024 | 21,893 | +516 | 2.41% |
| 2023 | 21,377 | +158 | 0.74% |
| 2022 | 21,219 | +420 | 2.02% |
| 2021 | 20,799 | +931 | 4.69% |
| 2020 | 19,868 | +340 | 1.74% |
| 2019 | 19,528 | +640 | 3.39% |
| 2018 | 18,888 | +429 | 2.32% |
| 2017 | 18,459 | +49 | 0.27% |
Showing 10 of 27 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.
Arlington is growing faster than Snohomish County, Washington, and the U.S.
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.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 211 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
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 8 residents
48% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 48% | 50% | 47% |
| Never married | 32% | 37% | 27% |
| Divorced | 13% | 11% | 16% |
| Widowed | 5% | 2% | 7% |
| Separated | 2% | <1% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources