Is Mercer Island growing?
How much Mercer Island, 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.
Mercer Island looks different than it did in 2015.
Population change since 2015: +4.8% — 24,120 residents in 2015 → 25,282 in 2023
Mercer Island population, 2015 to 2023
- 2015: 24120
- 2023: 25282
Growth since 2015
- Mercer Island: 4.8
- King County: 10.6
- WA: 10.8
- U.S.: 5
Median age: 45.8 — U.S. median: 38.7
What it means
Mercer Island is growing at roughly the national pace since 2015.
Residents here are older than the country overall — the median resident is about 7.1 years older than the U.S. median.
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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