Mercer Island in Washington state ranks among the wealthiest suburbs in the United States, according to a new analysis of government data by personal finance site GOBankingRates.
GOBankingRates used 2023 U.S. Census data to rank the wealthiest suburb in each of the 50 largest U.S. metro areas, analyzing household mean income, one-year income growth, and the average home value as of June 2025 and its year-over-year change.
Here’s what else to know about Mercer Island, part of the Seattle metro area, and other wealthy suburbs in the nation:
What to know about Mercer Island, Washington state’s wealthiest suburb
An island community located in Lake Washington between Seattle and Bellevue, Mercer Island has a population of more than 25,000 people. In 2023, it had a household mean income of $303,425, which was a 1.22% increase from the previous year. As of June 2025, the average single-family home value was $2,494,508, marking a 2.49% increase from the prior year, according to the GOBankingRates study…