About 98040 - Mercer Island, Washington
The ZIP code 98040 of Mercer Island falls within Washington, the United States - a mid-sized area by population. It sits within Mercer Island County County.
Census data puts the population of this ZIP code at 30,883 residents. That's noticeably above the average for a Washington ZIP code, which sits near 21,959 people.
Median household income is about $96,600 (near the Washington average).
Other ZIP code codes in Washington serve areas such as Tacoma, Milton, Seattle.