Mercer Island, WA 98040 ZIP Code Profile

Related Place Profiles:
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: 1,083
  • PO Box Addresses: 686
  • Residential Addresses: 10,130
    • Multi-Family Addresses: 2,816
    • Single Family Addresses: 7,314

The ZIP Code maps and database are updated 4 times per year.
Database updated: August 1, 2018, Maps updated: August 1, 2018.

Jump to... (On This Page!)
  1. 98040 2018 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 - 2018 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, 2018, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Mercer Island, WA 98040 Data & Demographics (As of July 1, 2018)


Total Population 25,133
Population in Households 25,133
Population in Familes 21,554
Population in Group Qrtrs 0
Population Density2 3,988
Diversity Index3 47


Median Household Income $150,964
Average Household Income $212,542
Per Capita Income $85,379


Total Housing Units 10,835 (100%)
Owner Occupied HU 6,910 (63.8%)
Renter Occupied HU 3,186 (29.4%)
Vacant Housing Units 739 ( 6.8%)
Median Home Value $1,166,809
Average Home Value $1,265,355


Total Households 10,096
Average Household Size 2.49
Family Households 7,222
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.


2010-2018 2018-2023
Population 1.24% 1.22%
Households 1.25% 1.17%
Families 1.22% 1.17%
Median Household Income   1.15%
Per Capita Income   1.63%

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

The table below compares 98040 to the other 581 ZIP Codes in Washington by rank and percentile using July 1, 2018 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 # 127 78th
Population Density # 74 87th
Diversity Index # 219 62nd
Median Household Income # 5 99th
Per Capita Income # 3 100th

Additional comparisons and rankings can be made with a VERY EASY TO USE Washington Census Data Comparison Tool.

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