Cost of Living in Mercer Island
Mercer Island runs among the most expensive housing markets in Washington on every cited figure, layered with Washington's no state income tax, a real capital gains excise tax directly relevant to the island's exceptional affluence, and King County's highest-in-Washington property tax rate.
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Learn moreHousing: among the most expensive in Washington, with a real disclosed spread
Zillow's modeled home value ran $2,328,509 (down 2.2% YoY), against a $2.5M three-month median sale price and a considerably higher $2.7M 30-day median (up 10.2% YoY) -- a real, disclosed spread reflecting genuine short-window sales volatility in a small, low-transaction-volume market.
Rent: the most expensive of the five markets in this batch
Mercer Island average rent ran $2,636-$2,691/month as of January 2026 -- the highest of the five Eastside/Puget Sound markets built in this same batch.
Washington's no income tax and Mercer Island's combined sales tax
Washington levies no state personal income tax. Mercer Island's combined sales tax rate is estimated at approximately 10.1% -- confirm the current precise rate directly for a specific address.
King County's property tax structure applies to a much larger dollar bill
Mercer Island shares King County's countywide average effective property tax rate (~0.83%), but given the island's genuinely much higher home values, the actual DOLLAR tax bill on a typical Mercer Island home runs considerably higher than on a typical Kirkland or Issaquah home at the identical rate.
Key takeaways
- Mercer Island home prices carry a real, disclosed $2.33M-$2.7M spread depending on methodology and time window.
- Rent averaged $2,636-$2,691/month -- the highest of the five markets in this batch.
- Washington's no state income tax and Mercer Island's roughly 10.1% combined sales tax apply to residents.
- King County's property tax rate applies to a genuinely much larger dollar bill given Mercer Island's high home values.
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