Current Mercer Island median home price: $2,252,719
| Date | Average price (≈) | Minimum price (⇓) | Maximum price (⇑) |
|---|---|---|---|
| 2025 September | $2,315,251 | $2,083,726 | $2,546,776 |
| 2025 October | $2,337,655 | $2,103,889 | $2,571,420 |
| 2025 November | $2,360,275 | $2,124,248 | $2,596,303 |
| 2025 December | $2,383,115 | $2,144,803 | $2,621,426 |