DuPont, WA vs Mercer Island, WA

The cost of living difference between DuPont, WA and Mercer Island, WA is dramatic. DuPont is 43.4% cheaper than Mercer Island, a gap that translates to thousands of dollars per year in household expenses. DuPont has a cost index of 152 while Mercer Island sits at 269, 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 DuPont is $2,230/month compared to $2,464/month in Mercer Island — a 10% difference. Home values follow the same pattern: DuPont is more affordable at $550,200 median vs $1,884,200.

Median household income in DuPont is $114,423 compared to $202,359 in Mercer Island (-43.5%). While Mercer Island is more expensive, its higher salaries more than compensate — residents there may actually end up with more disposable income. Looking at affordability, residents of DuPont spend roughly 23.4% of their income on rent, more than the 14.6% in Mercer Island.

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