Mercer Island

Population: 25,282
Median household income: $202,359
Median home value: $1,884,200

Mercer Island is a community in King County, Washington, home to 25,282 residents. The median household income of $202,359 is above the King County median ($122,148).

Between 2019 and 2023, Mercer Island's population declined 1.5% from 25,675 to 25,282, while its median home value rose 54.7% from $1,218,200 to $1,884,200.

Households average 2.54 people. The median gross rent is $2,464.

Demographics

ACS 2019–2023

Population: 25,282
Median age: 45.8 yrs
Median household income: $202,359
Median home value: $1,884,200
Median gross rent: $2,464
Housing units: 10,454
Homeownership rate: 66.0%
Bachelor's degree or higher: 78.8%
Unemployment rate: 2.5%

Trends

ACS 5-year · 2019–2023

Population

25,67525,282

Median household income

$147,566$202,359

Median home value

$1,218,200$1,884,200

Median gross rent

$2,162$2,464

Year	Population	Median household income	Median home value	Median gross rent
2019	25,675	$147,566	$1,218,200	$2,162
2020	25,820	$150,506	$1,386,300	$2,166
2021	25,506	$170,000	$1,504,500	$2,244
2022	25,464	$190,985	$1,683,600	$2,315
2023	25,282	$202,359	$1,884,200	$2,464

Each year is a US Census Bureau ACS 5-year estimate ending that year.

Age distribution

Under 53.9%

5 to 1718.2%

18 to 246.0%

25 to 348.3%

35 to 4412.1%

45 to 5416.8%

55 to 6413.7%

65 to 749.9%

75 and over11.1%

	Count	Share
Under 5	978	3.9%
5 to 17	4,607	18.2%
18 to 24	1,518	6.0%
25 to 34	2,099	8.3%
35 to 44	3,061	12.1%
45 to 54	4,249	16.8%
55 to 64	3,459	13.7%
65 to 74	2,510	9.9%
75 and over	2,801	11.1%

Race & ethnicity

	Count	Share
White (non-Hispanic)	16,503	65.3%
Black or African American	345	1.4%
American Indian & Alaska Native	7	0.0%
Asian	5,609	22.2%
Native Hawaiian & Pacific Islander	0	0.0%
Some other race	162	0.6%
Two or more races	2,068	8.2%
Hispanic or Latino (any race)	588	2.3%

Educational attainment (age 25+)

No high school diploma1.9%

High school graduate5.3%

Some college or associate's14.0%

Bachelor's degree38.3%

Graduate or professional degree40.5%

	Count	Share
No high school diploma	339	1.9%
High school graduate	970	5.3%
Some college or associate's	2,544	14.0%
Bachelor's degree	6,957	38.3%
Graduate or professional degree	7,369	40.5%

Commute to work

Mean travel time to work: 25 min

Drove alone51.6%

Carpooled4.6%

Public transit4.6%

Walked1.6%

Bicycle0.2%

Worked from home35.7%

Other means1.7%

How workers get to work

	Count	Share
Drove alone	6,134	51.6%
Carpooled	543	4.6%
Public transit	546	4.6%
Walked	193	1.6%
Bicycle	18	0.2%
Worked from home	4,247	35.7%
Other means	206	1.7%

Travel time

	Count	Share
Under 15 min	1,569	20.5%
15 to 29 min	3,179	41.6%
30 to 44 min	2,080	27.2%
45 to 59 min	477	6.2%
60+ min	335	4.4%

Households

Average household size: 2.54
Poverty rate: 4.6% (1,168 of 25,156)

	Count	Share
Family households	7,025	71.0%
Nonfamily households	2,868	29.0%

Housing

Median year structure built: 1973

Occupancy

	Count	Share
Occupied	9,893	94.6%
Vacant	561	5.4%

Tenure (of occupied units)

	Count	Share
Owner-occupied	6,529	66.0%
Renter-occupied	3,364	34.0%

1-unit, detached65.6%

1-unit, attached0.4%

2 to 4 units1.0%

5 to 19 units8.0%

20 or more units24.2%

Mobile home & other0.8%

Units in structure

	Count	Share
1-unit, detached	6,857	65.6%
1-unit, attached	37	0.4%
2 to 4 units	108	1.0%
5 to 19 units	835	8.0%
20 or more units	2,533	24.2%
Mobile home & other	84	0.8%

Geography

Place GEOID: 5345005
Type (LSAD): 25
Land area: 6.38 sq mi
Water area: 6.52 sq mi
Center point: 47.5640, -122.2312