Black Diamond, WA vs Coupeville, WA

The cost of living difference between Black Diamond, WA and Coupeville, WA is dramatic. Coupeville is 60.1% cheaper than Black Diamond, a gap that translates to thousands of dollars per year in household expenses. Black Diamond has a cost index of 174 while Coupeville sits at 109, 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 Black Diamond is $2,340/month compared to $1,009/month in Coupeville — a 132% difference. Home values follow the same pattern: Coupeville is more affordable at $495,400 median vs $776,400.

Median household income in Black Diamond is $144,728 compared to $66,696 in Coupeville (+117%). While Black Diamond is more expensive, its higher salaries more than compensate — residents there may actually end up with more disposable income. Looking at affordability, residents of Black Diamond spend roughly 19.4% of their income on rent, more than the 18.2% in Coupeville.

Climate-wise, both cities share similar average temperatures (53.6°F vs 52.1°F). Black Diamond receives more rainfall at 34.7" per year compared to 19.9" in Coupeville.