Mercer Island, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Mercer Island, Washington is 25,282 as of the 2023 American Community Survey, making it the 51st-largest city in Washington. The median household income is $202,359, the median home value is $1,884,200, and the median age is 45.8.
The population has grown 11.1% since 2010 (22,769 → 25,302).
25,282
Population
3961
People / sq mi
$202,359
Median Income
$1,884,200
Median Home Value
Mercer Island covers 6.4 sq mi of land at 3961 people per square mile.
About Mercer Island, WA
Mercer Island is a city in Washington with a population of 25,282. It ranks #51 among cities in Washington by population. The median age is 45.8, older than the national median. The population is 46.4% male and 53.6% female.
The median household income in Mercer Island is $202,359, above the US median of $74,580. 2.8% of residents live below the federal poverty level. Home values sit at a median of $1,884,200, with monthly rent averaging $2,464. The homeownership rate of 66.0% is close to the national rate of 64.8%.
Educational attainment in Mercer Island reflects 78.8% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 35.7% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 24.9 minutes each way.
Mercer Island city Population History (2010-2024)
The city of Mercer Island city had a population of 22,769 in 2010 and 25,302 in 2024, a 11.1% growth over 14 years. The peak was 25,894 in 2019. Average annual growth rate: 0.76%.
25,302
Population (2024)
22,769
Population (2010)
25,894
Peak (2019)
0.76%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 22,769 |
| 2011 | 23,528 |
| 2012 | 24,036 |
| 2013 | 24,418 |
| 2014 | 24,726 |
| 2015 | 25,350 |
| 2016 | 25,584 |
| 2017 | 25,720 |
| 2018 | 25,882 |
| 2019 | 25,894 |
| 2020 | 25,750 |
| 2021 | 25,337 |
| 2022 | 25,105 |
| 2023 | 25,064 |
| 2024 | 25,302 |
Race & Ethnicity
| White | 65.7% |
| Black or African American | 1.4% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 0.9% |
| Two or More Races | 0.0% |
Economy & Income
$202,359
Median Household Income
$120,120
Per Capita Income
2.8%
Poverty Rate
1.5%
Unemployment Rate
Housing
$1,884,200
Median Home Value
$2,464
Median Rent
66.0%
Owner-Occupied
Education
98.1%
High School+
78.8%
Bachelor's+
Commute
4.6%
Drive Alone
51.6%
Public Transit
35.7%
Work From Home
24.9 min
Avg Commute
Community Profile
38.9%
Foreign Born
75.8%
Non-English at Home
4.6%
Veterans
9.7%
With Disability
98.4%
Health Insurance
97.6%
Internet Access
Employment by Industry
| Finance, Insurance & Real Estate | 27.2% |
| Professional, Scientific & Management | 21.6% |
| Information | 11.8% |
| Education, Health Care & Social Services | 6.1% |
| Transportation & Warehousing | 6.1% |
| Manufacturing | 4.1% |
| Arts, Entertainment & Food Services | 4.0% |
| Retail Trade | 3.4% |
| Construction | 2.0% |
| Public Administration | 2.0% |
Largest cities in Washington
Largest counties in Washington
Part of Washington
Metro areas in Washington
City rankings
Frequently Asked Questions
Mercer Island, Washington has a population of 25,282 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 51st-largest city in Washington.
The median household income in Mercer Island, Washington is $202,359, with 2.8% of residents living below the federal poverty level.
The median home value in Mercer Island, Washington is $1,884,200, with median monthly rent at $2,464 and a homeownership rate of 66.0%.
The median age in Mercer Island, Washington is 45.8 years. The population is 46.4% male and 53.6% female.
The population has grown 11.1% since 2010 (22,769 → 25,302).
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Statewide data for Washington
Population, race, income, age, and trends across Washington
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.