Assisted living homes in Mercer Island, Washington
Local supply and market context for residential assisted living in Mercer Island.
Updated July 2026
Mercer Island, WA has 11 licensed assisted living homes (354 beds, averaging 32.2 per home). It sits in King County, a strong RAL market scoring 7.4/10, with 129,465 seniors 75+ growing 13.8%.
Licensed homes
11
Mercer Island
Licensed beds
354
total
Avg home size
32.2 beds
per home
County opportunity
7.4/10
Strong
The Mercer Island assisted living market
Mercer Island has 11 licensed assisted living homes totaling 354 beds — an average of 32.2 beds per home, skewing toward larger communities. As part of King County, it draws on a 75+ population of 129,465 growing 13.8%, with a senior median income of $76,893. See the full King County market or all Washington top markets.
Frequently asked questions
How many assisted living homes are in Mercer Island, WA?
Mercer Island has 11 licensed assisted living homes with about 354 total beds.
Is Mercer Island a good place to open an assisted living home?
Mercer Island is in King County, which scores 7.4/10 (Strong) on RAL Market Scout; its 75+ population is growing 13.8%. Current local supply is 11 homes.
What county is Mercer Island in?
Mercer Island is in King County, Washington.
Evaluate a Mercer Island site
RAL Market Scout builds a full demand-and-supply report for any specific address in Mercer Island.
Sources: Home and bed counts from the Washington licensing roster (RAL Market Scout pipeline). County demand, growth, and income from U.S. Census ACS. Snapshot: 2026-07. Informational only — not legal, financial, or investment advice.