| ZIP Code | 98040 |
|---|---|
| City | Mercer Island |
| State | Washington (WA) |
| County | King County |
| Area Code | 206 |
| Elevation | 16 ft |
| Latitude | 47.564004 |
|---|---|
| Longitude | -122.231214 |
| Timezone | Los Angeles (DST) |
| FIPS | 53033 |
| ZIP Type | Standard |
| Status | Active |
Race & Ethnicity
Age Breakdown
Key Indicators
| Median Age | 45.8 yrs |
|---|---|
| Avg Household Size | 2.54 |
| Below Poverty | 4.6% ▼ 54% below avg |
| College Grads | 84.1% ▲ 117% above avg |
| Unemployment | 2.5% ▼ 50% below avg |
| No HS Diploma | 118 (0.7%) |
| HS Graduate | 920 (5.5%) |
| Some College | 322 (1.9%) |
| Associates | 1,287 (7.7%) |
| Bachelors | 1,017 (6.1%) |
| Graduate Degree | 12,971 (78%) |
Education
Housing Tenure
Home Value Distribution
Financials
| Median HH Income | $202,359 ▲ 165% above avg ↑ 37% since 2019 |
|---|---|
| Median Home Value | $1,884,200 ▲ 576% above avg ↑ 55% since 2019 |
| Home/Income Ratio | 9.3x (nat avg ~3.5x) |
| Median Rent | $2,464/mo ↑ 14% since 2019 |
| Total Units | 10,454 |
| Vacant Units | 561 |
| Avg HH Size | 2.54 |
Income Distribution
How People Get to Work
Commute Time
Year Built
Summary
| Total Units | 10,454 |
|---|---|
| Vacant | 561 |
| Owner Occupied | 66.0% |
| Renter Occupied | 34.0% |
| Avg HH Size | 2.54 |
ZIP code 98040 is located in Mercer Island, Washington, within King County. With a population of 25,282, this is a moderately populated ZIP code with a mature community — the median age is 45.8 years. Economically, 98040 is a affluent ZIP code: the median household income of $202,359 is more than double the national average.
Real estate in ZIP code 98040 represents among the most expensive housing markets in the country. The median home value of $1,884,200 is more than double the national average. Renters can expect to pay around $2,464 per month in median rent. Homeownership is strong here — 66.0% of occupied units are owner-occupied, suggesting an established, stable residential community. Median home values have increased by 55% since 2019.
The population of 98040 is majority White (65.28%). Residents are highly educated — 84.1% hold a bachelor's degree or higher, which is more than double the national average. Poverty affects a relatively small share of residents at 4.6%. Household income has grown by 37% since 2019.
The unemployment rate in 98040 stands at 2.5%, which is below the national average. A notably high share of workers — 36% — work from home, reflecting the professional makeup of the area. As in most parts of the country, driving alone is the dominant commute mode at 52%.
Overall, ZIP code 98040 in Mercer Island, WA is characterized as affluent, highly educated, a mature community, and predominantly owner-occupied. With 25,282 residents, a median household income of $202,359, and a median home value of $1,884,200, it offers a clear picture of life in this part of Washington.