Mercer Island, WA vs Summit, WA

The cost of living difference between Mercer Island, WA and Summit, WA is dramatic. Summit is 118.3% cheaper than Mercer Island, a gap that translates to thousands of dollars per year in household expenses. Mercer Island has a cost index of 269 while Summit sits at 123, making this one of the more striking comparisons on our site. Relocating between these cities would require a serious reassessment of budget and lifestyle expectations.

On the housing front, median rent in Mercer Island is $2,464/month compared to $1,460/month in Summit — a 69% difference. Home values follow the same pattern: Summit is more affordable at $480,000 median vs $1,884,200.

Median household income in Mercer Island is $202,359 compared to $107,977 in Summit (+87.4%). The higher salaries in Mercer Island partially offset the cost difference, but don't fully close the gap. Looking at affordability, residents of Mercer Island spend roughly 14.6% of their income on rent, less than the 16.2% in Summit.

Climate-wise, both cities share similar average temperatures (53.8°F vs 51.9°F). Summit receives more rainfall at 42" per year compared to 36.5" in Mercer Island.