Mercer Island, WA vs Vashon, WA

The cost of living difference between Mercer Island, WA and Vashon, WA is dramatic. Vashon is 89.1% 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 Vashon sits at 142, 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 $1,444/month in Vashon — a 71% difference. Home values follow the same pattern: Vashon is more affordable at $717,700 median vs $1,884,200.

Median household income in Mercer Island is $202,359 compared to $115,750 in Vashon (+74.8%). 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 15% in Vashon.

Climate-wise, both cities share similar average temperatures (53.8°F vs 53.7°F). Vashon receives more rainfall at 39.3" per year compared to 36.5" in Mercer Island.