Washington Gazetteer
Also See Mercer Island, WA: ZIP Codes & Maps
The City of Mercer Island had a population of 25,840 as of July 1, 2024. Mercer Island ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Washington. See peer rankings below.
The primary coordinate point for Mercer Island is located at latitude 47.5707 and longitude -122.2221 in King County. The formal boundaries for the City of Mercer Island encompass a land area of 6.32 sq. miles and a water area of 0 sq. miles. King County is in the Pacific time zone (GMT -8).
The City of Mercer Island has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.
Washington is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Mercer Island is located within Seattle East Division of King County.
POPULATION | |
|---|---|
| Total Population | 25,840 (100%) |
| Population in Households | 25,676 (99.4%) |
| Population in Families | 21,816 (84.4%) |
| Population in Group Quarters1 | 164 ( 0.6%) |
| Population Density | 4,049 |
| Diversity Index2 | 59 |
INCOME | |
| Median Household Income | $200,001 |
| Average Household Income | $273,745 |
| % of Income for Mortgage4 | 56% |
| Per Capita Income | $104,566 |
| Wealth Index5 | 267 |
| Socioeconomic Status Index6 | High (66.8) |
HOUSING | |
|---|---|
| Total HU (Housing Units) | 10,436 (100%) |
| Owner Occupied HU | 6,849 (65.6%) |
| Renter Occupied HU | 3,020 (28.9%) |
| Vacant Housing Units | 567 ( 5.4%) |
| Median Home Value | $1,787,859 |
| Average Home Value | $1,728,913 |
| Housing Affordability Index3 | 44 |
HOUSEHOLDS | |
| Total Households | 9,869 |
| Average Household Size | 2.60 |
| Family Households | 6,938 |
| Average Family Size | 3.00 |
GROWTH RATE / YEAR |
2020-2024 | 2024-2029 |
|---|---|---|
| Population | 0.08% | -0.09% |
| Households | -0.14% | -0.36% |
| Families | -0.28% | |
| Median Household Income | 0.00% | |
| Per Capita Income | 2.14% | |
| Owner Occupied HU | 0.08% |
The table below compares Mercer Island to the other 639 incorporated cities, towns and CDPs in Washington by rank and percentile using July 1, 2024 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 | # 51 | 92nd |
| Population Density | # 47 | 93rd |
| Median Household Income | # 8 | 99th |
| Housing Affordability Index | # 92 | 14th |
| Per Capita Income | # 6 | 99th |
| Diversity Index | # 203 | 69th |
Additional comparisons and rankings can be made with a VERY EASY TO USE Washington Census Data Comparison Tool.
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