Is Sammamish growing?
How much Sammamish, WA has grown or shrunk since 2015, how that compares with the county, the state and the United States, and how the community's age is changing.
U.S. Census Bureau, American Community Survey 5-year estimates.
This story was assembled using AI and public data sources.
Sammamish looks different than it did in 2015.
Population change since 2015: +32.3% — 50,163 residents in 2015 → 66,375 in 2023
Sammamish population, 2015 to 2023
- 2015: 50163
- 2023: 66375
Growth since 2015
- Sammamish: 32.3
- King County: 10.6
- WA: 10.8
- U.S.: 5
Median age: 39.4 — U.S. median: 38.7
What it means
Sammamish is growing faster than the country as a whole — +32.3% here versus +5.0% nationally since 2015.
These are estimates, not a head count. ACS 5-year figures average responses collected over five years, so they show direction and scale rather than a single day's population.
Sources
- U.S. Census Bureau — American Community Survey (ACS) 5-year estimates — Population, income, housing, education, commuting and poverty figures
- Census Bureau API — ACS Detailed Tables — The endpoint these pages are generated from
- data.census.gov — Look up the same tables for any place yourself
- ACS accuracy statement — Estimates carry margins of error; small places vary the most
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