HomeWashingtonKing CountyMercer Island city
Mercer Island city, Washington: commercial real estate data.
Mercer Island city is a Census city of 25,307 people across 6.38 square miles of land, in King County. Median household income is $219,069, 67.0 percent of occupied homes are owned, and the SBA record carries 16 7(a) approvals to borrowers here worth $4.8 m.
76 sourced place values · tier FULL · 8 sections · underlined figures are computed by MMCG Analytics, not published by the agency
Mercer Island
What Mercer Island is
- Census place typecity
- Land area6.38 sq mi
- Water area6.52 sq mi
- Population per square mile of land3,965
- County holding the largest share of its areaKing County, 100.0 percent
US Census Bureau, cartographic boundary file, places, 2024 vintage. US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Mercer Island
How many people live in Mercer Island
- Population25,307
- Median age46.4
- Population under 185,434
- Share under 1821.5 percent
- Population 65 and over5,610
- Share 65 and over22.2 percent
- Households10,068
- Family households7,027
- Share of households that are families69.8 percent
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Mercer Island
Income and work in Mercer Island
- Median household income$219,069
- Per capita income$128,615
- Civilian labor force12,601
- Employed12,219
- Unemployed382 plus or minus 152
- Unemployment rate3.0 percent plus or minus 1.2
- Adults 25 and over18,230
- Adults 25 and over with a high school diploma or higher98.4 percent
- Adults 25 and over with a bachelor degree or higher81.4 percent
- Adults 25 and over with a graduate degree44.7 percent
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Mercer Island
Housing in Mercer Island
- Housing units10,609
- Occupied units10,068
- Vacant units541 plus or minus 197
- Vacancy rate5.1 percent plus or minus 1.8
- Owner occupied6,746
- Renter occupied3,322
- Ownership rate67.0 percent
- Median owner-occupied home value$2,000,001
- Median gross rent, monthly$2,502
- Annual rent as a share of median income13.7 percent
- Single family units7,109
- Share single family67.0 percent
- Units in buildings of two or more3,421
- Share in buildings of two or more32.2 percent
- Mobile homes79 plus or minus 76
- Median year structure built1973
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Mercer Island
How Mercer Island gets to work
- Workers 16 and over who commute7,383
- Commuting under 15 minutes1,545
- Share commuting under 15 minutes20.9 percent
- Commuting 30 minutes or more2,358
- Share commuting 30 minutes or more31.9 percent
- Drove alone51.7 percent
- Carpooled3.8 percent plus or minus 1.5
- Public transport3.1 percent plus or minus 1.0
- Walked1.6 percent plus or minus 0.9
- Worked from home38.6 percent
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
Mercer Island
SBA loans in Mercer Island (7(a))
- Approvals16
- Gross approval$4,815,000
- Average approval$300,938
- Median approval$277,500
- Ninetieth percentile approval$500,000
- Largest approval$1,733,000
- Jobs supported105
- Jobs per approval6.6
- Loans with a final outcome5
- Paid in full4
- Charged off1
- Median term120 months
- Share on real estate terms of 20 years or more0.0 percent
- Share to franchises0.0 percent
- Distinct lenders11
- Distinct industries by NAICS13
A charge-off rate is not published here. only 5 resolved loans, too few to publish a rate, and a rate over that few outcomes would move several points on one loan.
US Small Business Administration, 7(a) FOIA release, FY2020 to FY2026 year to date, as of 2026-06-30.
Mercer Island
SBA loans in Mercer Island (504)
- Approvals1
- Gross approval$257,000
- Average approval$257,000
- Median approval$257,000
- Largest approval$257,000
- Jobs supported5
- Loans with a final outcome1
- Charged off0
- Median term240 months
- Distinct CDCs1
US Small Business Administration, 504 FOIA release, FY2010 to FY2026 year to date, as of 2026-06-30.
King County, not Mercer Island
King County context, not Mercer Island figures
These are King County figures. There is no place level equivalent published for any of them, so they are shown as the county backdrop and never as Mercer Island measurements.
- Establishments in King County70,376
- Employment at those establishments, King County1,305,947
- Covered employment, King County1,449,785
- Average annual pay, King County$132,279
- Average weekly wage, King County$2,544
- Housing units permitted, King County10,564
- Of those, single family, King County2,352
- County product, 2024, King County$477,154,354,000
- County product change over the prior year, King County7.9 percent
- Average income of an arriving household, King County$117,917
Every figure in this section is published for King County as a whole and is not a measurement of Mercer Island. It is here because a county backdrop is what a credit committee reads a place against, and it is labelled so that it can never be quoted as the place's own.
US Census Bureau, County Business Patterns, 2023. US Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages. US Census Bureau, Building Permits Survey, 2024 annual. US Bureau of Economic Analysis, Regional, table CAGDP2, CAGDP2, through 2024. US Internal Revenue Service, Statistics of Income county migration flows, 2021 to 2022 filing years.
Coverage
What this page does not hold.
Every item below could be filled with a plausible figure. None of them is. On a page a lender may read, a number that cannot be traced is worse than an absence, so the absences are named.
- This place is not listed as a community in the FEMA Community Status Book, so no NFIP participation or CRS class is shown.
- Parcel level detail, zoning and flood zone at an address are resolved in the platform, not on this page.
SBA figures count approvals to borrowers whose address is in the place. They are not approvals for projects inside the place boundary: the tape records a borrower city and a project county, and those can differ.
Common questions
Mercer Island questions, answered from the record.
How many people live in Mercer Island, Washington?
25,307, in 10,068 households. Mercer Island city covers 6.38 square miles of land, which is 3,965 people per square mile. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
What county is Mercer Island in?
King County, which holds 100.0 percent of the place by area. Source: US Census Bureau, cartographic boundary file, places, 2024 vintage.
What is the median household income in Mercer Island?
$219,069. The median owner-occupied home is valued at $2,000,001. Median gross rent is $2,502 per month. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
How much SBA lending goes to Mercer Island businesses?
16 7(a) approvals totalling $4.8 m, across 11 lenders, median approval $277,500, plus 1 504 approvals worth $257,000. These count approvals to borrowers whose address is in Mercer Island, not projects sited inside the place boundary, and they are approvals recorded in the release rather than loans disbursed.
Do SBA loans to Mercer Island borrowers get paid back?
No rate is published for Mercer Island. only 5 resolved loans, too few to publish a rate, and a percentage over that few outcomes would move several points on a single loan. The counts are shown instead.
Are the county figures on this page Mercer Island figures?
No, and they are labelled so. County Business Patterns, QCEW, the Building Permits Survey, BEA product and IRS migration are published for King County as a whole and there is no place level equivalent. They appear in one clearly marked section as context and are never presented as measurements of Mercer Island.
Is zoning published for Mercer Island?
Not yet. The zoning layer is in build. Nothing on this page presents parcel level zoning.
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