Mercer Island, WA 98040 ZIP Code Profile

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Mercer Island, WA

ZIP Code 98040: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Mercer Island, WA 98040

  • ZIP Code Type: STANDARD
  • County: King County
  • Centroid: Latitude 47.564, Longitude -122.226
  • Time Zone: Pacific Time Zone (UTC -8 hours)
  • Observes DST: Yes
  • Businesses Addresses: 1,095
  • PO Box Addresses: 676
  • Residential Addresses: 10,094
    • Multi-Family Addresses: 2,778
    • Single Family Addresses: 7,316

The ZIP Code maps and database are updated 4 times per year.
Database updated: August 1, 2019, Maps updated: August 2, 2019.

Jump to... (On This Page!)
  1. 98040 2019 Demographic Data
  2. Growth Rates for 98040 (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Washington Research Tools (Easy Tools & Current Data)
  3. Washington Data Comparison Tool - 2019 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2019, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Mercer Island, WA 98040 Data & Demographics (As of July 1, 2019)


Total Population 25,278
Population in Households 25,278
Population in Familes 21,576
Population in Group Qrtrs 0
Population Density2 4,011
Diversity Index3 48


Median Household Income $166,786
Average Household Income $233,328
Per Capita Income $94,197


Total Housing Units 11,036 (100%)
Owner Occupied HU 6,979 (63.2%)
Renter Occupied HU 3,226 (29.2%)
Vacant Housing Units 831 ( 7.5%)
Median Home Value $1,212,244
Average Home Value $1,308,497


Total Households 10,205
Average Household Size 2.48
Family Households 7,310
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2019 2019-2024
Population 1.17% 1.11%
Households 1.24% 1.1%
Families 1.22% 1.12%
Median Household Income   1.18%
Per Capita Income   1.39%

Mercer Island, WA 98040 - Peer Comparisons by Rank and Percentile

The table below compares 98040 to the other 587 ZIP Codes in Washington by rank and percentile using July 1, 2019 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 131 78th
Population Density # 75 87th
Diversity Index # 214 64th
Median Household Income # 4 99th
Per Capita Income # 2 100th

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