City safety & data profile

Mercer IslandWA

Mercer Island, WA is a 25K-resident city in King County with a median household income of $219,069.

King County, Washington. Federal health, economic, and safety indicators for Mercer Island, drawn from the U.S. Census Bureau American Community Survey, CDC PLACES, and CMS Hospital Compare. Mercer Island has a population larger than 56% of the 4,640 U.S. cities Areazine tracks, and a median home value of $2,000,000+.

Data updated 2026-09-03

25K
Population (place)
Top 44%
By size
$219,069
Median income (place)
$2,000,000+
Median home (place)
3.8%
Poverty rate (place)
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The read on Mercer Island

Mercer Island posts a median household income higher than 99% of U.S. cities Areazine tracks.

Top 1%
by median income, US cities

Where Mercer Island income ranks nationally

Median household income vs. every place Areazine profiles (place-level ACS)

$219,069 Top 1% higher than 99% of 3,889 places Areazine profiles

Mercer Island $0 $260,000 every profiled place, bucketed by value

Each bar is a $20K-wide band; taller bars hold more places Areazine profiles. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, American Community Survey (place-level) · 2024 ACS 5-year

Largest cities in WA

Population among 109 WA places with 10,000+ residents and ACS income on Areazine. Tooltip shows the income rank in the same pool.

residents

What this shows Seattle is the largest WA city on this list; Sammamish leads median income.

Source U.S. Census Bureau, American Community Survey (place-level) As of 2024 ACS 5-year

Highest median incomes in WA

Median household income among the same 109-city pool. Tooltip shows the population rank.

median

What this shows Sammamish posts the highest place-level median income in WA; Seattle is largest by headcount.

Source U.S. Census Bureau, American Community Survey (place-level) As of 2024 ACS 5-year

The quick read

Reading Mercer Island, WA beyond the headline numbers

Mercer Island sits inside King County, Washington, at roughly 47.57°N, -122.22°W. Population 25,042, $219,069 median household income. Median home value $2,000,000+, median rent $2,502. Poverty rate 3.8%, read against that income figure since two cities on the same median can differ underneath it.

Hardship is low by national standards: 3.8% of Mercer Island, WA residents live below the poverty line, in the least-affected quarter of the 3,890 cities reporting a rate.

The median home in Mercer Island costs around 9.1 times what a median household earns in a year -- the most expensive quarter of reporting cities, and far enough ahead of local pay that ownership is largely closed to median earners.

38.6% of Mercer Island workers report working from home, the highest quarter of reporting cities. Where that share runs this high, local income increasingly reflects employers located somewhere else.

Among the CDC measures on this page, short sleep duration departs furthest from its peer median: 25.5% in Mercer Island, the lowest-prevalence quarter of the 3,852 cities reporting that measure.

3.1% of Mercer Island workers commute by public transit, a larger share than at least three quarters of reporting cities.

At 46.4 years, Mercer Island's median age is in the oldest quarter of reporting cities.

Sources: U.S. Census ACS, CDC PLACES, CMS Hospital Compare, plus live alerts for Mercer Island from FEMA, NOAA, FDA, and CPSC. Economic comparison bars use the unweighted average across tracked Census places with a reported value, not a household-weighted national median.

Population (place)
25,042
Mercer Island · Census Place
Median Income (place)
$219,069
+145% vs avg
Median Home Value (place)
$2,000,000+
+384% vs avg
Median Age (place)
46.4
years · ACS place

10-Year Trends 2013–2024

County-level trend (King County): Mercer Island's own historical series isn't separately published by the Census Bureau, so these year-over-year figures track the surrounding county, not the city alone.

20132024
Population
2.3M+16%
Median Income
$124,746+74%
Median Home Value
$859,900+128%
Poverty Rate
8.6%-25%
Unemployment
4.8%-38%

Economics

Economics indicators for Mercer Island, WA
IndicatorValue
Median Rent
$2,502/mo
Poverty Rate
3.8% -69% vs avg
Unemployment 3%
Bachelor's Degree+ 81.4%
Work From Home 38.6%
Public Transit 3.1%

Population

White 63.6%
African American 0.9%
Asian 24.5%
Two or More Ethnicities 8.6%

Health Profile 15 measures

Health Indicators

High Blood Pressure
29%
Short Sleep Duration
25.5%
Obesity
19.6%
Binge Drinking
15.3%
Frequent Mental Distress
11.6%
Physical Inactivity
11.5%
Current Asthma
9.2%
Frequent Physical Distress
8.8%
Diabetes
7.4%
Current Smoking
4.9%

Preventive Care

Dental Visit 78.2%
Annual Checkup 74.8%

Other Measures

Coronary Heart Disease
4.6%
Lack of Health Insurance
4%
Stroke
2.4%

What alerts and safety updates affect Mercer Island?

No area-tagged alerts are on record for Mercer Island right now. New federal and counterpart-agency notices still land in the site feed as agencies publish them.

City alert dispatch desk

Sheet WA-MERCER-ISLAND · Mercer Island

Mercer Island: no area-tagged alerts on record — state hubs carry the live CAP stream.

  • FEED-QUIET No tagged alerts
  • LEAD-NONE Feed idle
  • DESK-IDLE Awaiting feed

Counts reflect published articles tagged to Mercer Island; untagged NOAA county warnings may still appear in the site feed. Browse Washington state hubs · Methodology

Read with this city profile

Tracking Safety Alerts in Your Area

How Areazine tags Mercer Island in the CAP feed
All safety guides →

Frequently Asked Questions 5

What is the population of Mercer Island, WA? ▼
Mercer Island, WA has a population of 25,042 people, located in King County, Washington.
What is the median household income in Mercer Island? ▼
The median household income in Mercer Island, WA is $219,069 per year, per the U.S. Census ACS. The poverty rate is 3.8%.
What is the median home value in Mercer Island? ▼
The median home value in Mercer Island, WA is $2,000,000+. Median rent is $2,502/month.
What are the top health concerns in Mercer Island? ▼
The top health indicators in Mercer Island include High Blood Pressure (29%), Short Sleep Duration (25.5%), Obesity (19.6%). Data from CDC PLACES.
What is the median age in Mercer Island? ▼
The median age in Mercer Island, WA is 46.4 years. 81.4% of residents have a bachelor's degree or higher.

Nationwide cities with similar poverty or income 8

Two ACS-derived peer sets for Mercer Island, both outside Washington so the neighborhoods are not the geographic nearby list below.

Similar poverty rate

Nearest place-level ACS poverty rates outside WA (3.8% here).

Bowie, MD 3.8% Castle Rock, CO 3.8% Danville, CA 3.8% Hicksville, NY 3.8%

Similar median income

Nearest place-level ACS median household incomes outside WA ($219,069 here).

Colleyville, TX $218,328 Los Gatos, CA $217,554 Kensington, NY $220,625 Lowes Island, VA $220,833

Compare Mercer Island with another city

Pick a second U.S. city to open a side-by-side profile on population, income, health, and hospitals, the same federal datasets as this page.

Quick picks:

Nearby Cities 8

Bellevue, WA 140K Columbia City, WA 19K Newcastle, WA 11K Bryn Mawr-Skyway, WA 16K Renton, WA 100K Tukwila, WA 20K Kirkland, WA 87K Seattle, WA 781K
All cities in Washington → Compare Mercer Island vs Bellevue → All comparisons → Browse all cities

Using Mercer Island's profile

Use this as a starting research checklist, not a verdict on whether to live here.

  • Check live recalls, weather and hazard alerts scoped to the Mercer Island area before relying on national headlines. Check your area
  • Read the poverty rate alongside the income figure, two places with the same median can have very different realities.
  • Compare Mercer Island against Washington peers on any ranking lens. Explore Washington

Population and economics (income, home value, poverty, education) are place-level U.S. Census ACS; health is CDC PLACES; hospital counts reflect facilities in and around the city. County-level trends are labeled when shown.

Data Sources

All data on this page comes from official U.S. government sources. Population and economic data from the Census Bureau American Community Survey (2024 5-year estimates, place geography). Health data from the CDC PLACES program (2023). Hospital ratings from CMS Hospital Compare (2024). Climate data from NOAA. Education data from NCES. Cost of living from Bureau of Economic Analysis. Crime statistics, where referenced on Areazine, originate from the FBI Crime Data Explorer. Housing market figures referenced on Areazine come from HUD Fair Market Rents. Census economics and population are at place geography; some health and hospital indicators are reported at the county level (King County) where that is the smallest published unit.

Every figure on Areazine is published directly from official U.S. government sources, no number is typed in by an editor. City demographic and health figures are compiled directly from U.S. Census (place-level ACS), CDC, and CMS releases, updated quarterly within 30 days of upstream release. County-level trends are labeled when shown. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026.