Comparison to Surrounding Areas
The median household income ($219,069) for 98040 is less than the median household income for 98039 ($250,001). But it's more than 98178 ($99,505), 98004 ($182,545), 98006 ($198,150), 98056 ($113,688), 98112 ($171,572), 98118 ($113,762), 98122 ($106,886), 98144 ($96,969), and King County ($124,746). And it's the same as Mercer Island city ($219,069).
| 98040 | $219,069 |
| Mercer Island city | $219,069 |
| King County | $124,746 |
Get Median Household Income for all Zip Codes in Washington.
The average household income ($318,528) for 98040 is less than the average household income for 98039 ($488,829). But it's more than 98178 ($139,638), 98004 ($266,184), 98006 ($256,724), 98056 ($150,394), 98112 ($287,649), 98118 ($157,800), 98122 ($161,551), 98144 ($158,130), and King County ($176,799). And it's the same as Mercer Island city ($318,528).
| 98040 | $318,528 |
| Mercer Island city | $318,528 |
| King County | $176,799 |
Get Average Household Income for all Zip Codes in Washington.
The per-capita income for 98040 is $128,615. The per capita income ($128,615) for 98040 is less than the per capita income for 98004 ($132,758), 98039 ($171,315), and 98112 ($133,171). But it's more than 98118 ($61,620), 98006 ($90,517), 98056 ($60,863), 98178 ($49,953), 98122 ($92,135), 98144 ($77,755), and King County ($74,100). And it's the same as Mercer Island city ($128,615).
| 98040 | $128,615 |
| Mercer Island city | $128,615 |
| King County | $74,100 |
Get Per-Capita Income for all Zip Codes in Washington.
53.6% of households make over $200,000 a year. The percent high income households (53.6%) for 98040 is less than the percent high income households for 98039 (60.0%). But it's more than 98178 (18.0%), 98004 (45.8%), 98006 (49.7%), 98056 (23.7%), 98112 (43.7%), 98118 (27.7%), 98122 (24.5%), 98144 (26.4%), and King County (29.8%). And it's the same as Mercer Island city (53.6%).
| 98040 | 53.6% |
| Mercer Island city | 53.6% |
| King County | 29.8% |
Get High Income Households for all Zip Codes in Washington.
| under 25 years | 25 to 44 years | 45 to 64 years | 65 years and over | |
|---|---|---|---|---|
| 98040 | $74,250 | $230,588 | $250,001 | $112,679 |
| Mercer Island city | $74,250 | $230,588 | $250,001 | $112,679 |
| King County | $65,321 | $143,048 | $147,614 | $76,893 |
Get Median Household Income by Age of Householder for all Zip Codes in Washington.
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All income statistics above are the most current, comparable income statistics available from the US Census Bureau and are from the American Community Survey 2024 5-year estimates. You can find this information and other demographics for 98040 on the US Census Bureau’s website. These values are in 2024 inflation-adjusted dollars and were downloaded on 29 January 2026.
Margins of error for the income data are:
| Median Household Income | Average Household Income | Per Capita Income | High Income Households | Median Household Income by Age of Householder | ||||
|---|---|---|---|---|---|---|---|---|
| under 25 | 25 to 44 | 45 to 64 | 65+ | |||||
| 98040 | +/-$17,476 | +/-$23,112 | +/-$8,745 | +/-3.3% | +/-$20,468 | +/-$30,536 | +/-$-1 | +/-$24,793 |
| Mercer Island city | +/-$17,476 | +/-$23,112 | +/-$8,745 | +/-3.3% | +/-$20,468 | +/-$30,536 | +/-$-1 | +/-$24,793 |
| King County | +/-$968 | +/-$1,434 | +/-$589 | +/-0.3% | +/-$4,203 | +/-$2,300 | +/-$2,834 | +/-$1,904 |