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CITY · 1990 CENSUS

Mercer Island

Washington · 20,816 residents · 6.383 sq mi
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The short version

Mercer Island is significantly wealthier than the US average, with a median household income of $61,572. Population has declined 6% since 2000. 60% of adults hold a bachelor's degree or higher, well above the national rate of 20%. Median home value is $332,500. With a median age of 41.0, the population is older than the US median of 33.0. Households here earn about 97% more than the Washington median.

At a glance
Wealthier
above the US median
US median: $30,130
Older
median age 41.0
US median: 33.0
More educated
60% hold a bachelor's degree
US average: 20%
More affordable
home values down 20%, inflation adjusted
US median home: $93,722
Section 01

Population & growth

20,816
−6%vs 2000
vs 22,036 in 2000
1990 – 2025
3,261 / sq mi
−6%vs 2000
vs 3,452 / sq mi in 2000
US average: 221
41.0
−8%vs 2000
vs 44.3 in 2000
US average: 33.0
Population, 19902024
20K22K23K25K26K1990201020202024Mercer Island
202425K
1990201020202024
Section 02

Income & economy

$61,572
−12%inflation adjusted, since 2000
vs $91,904 in 2000
US average: $30,130
1990 – 2024
$31,438
−42%vs 2000
vs $53,799 in 2000
US average: $14,340
2.3%
−0.9 ptsvs 2000
vs 3.2% in 2000
US average: 13.2%
Section 03

Housing

$332,500
−20%inflation adjusted, since 2000
vs $548,300 in 2000
US average: $93,722
1990 – 2024
$607
−21%inflation adjusted, since 2000
vs $1,014 in 2000
US average: $450
78.7%
−1.8 ptsvs 2000
vs 80.5% in 2000
21.3% rent
5.4
−9%vs 2000
vs 6.0 in 2000
1990 – 2024
RELATED:See current rent listings in Mercer Island on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic82.8%(18,249)
Black1.1%(250)
Hispanic / Latino1.9%(410)
Asian11.8%(2,607)
Other0%
Diversity Score33.2%(7,312)
1990
White, non-Hispanic90.5%(18,848)
Black0.8%(163)
Hispanic / Latino1.3%(269)
Asian8%(1,674)
Other0.6%(131)
Diversity Score24.3%(5,057)
24
−27%vs 2000
vs 33 in 2000
1990 – 2024
Section 05

Education

60.3%
−8.8 ptsvs 2000
vs 69.1% in 2000
US average: 20.3%
High school or higher
96.8%
−1.0 ptsvs 2000
vs 97.7% in 2000
US average: 75.2%
24.0%
−7.6 ptsvs 2000
vs 31.6% in 2000
US average: 7.1%
Section 06

Commute & transportation

24.6 min
+84%vs 2000
vs 13.4 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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Frequently asked

How many people live in Mercer Island, Washington?

Mercer Island, Washington has about 20,816 residents according to the 1990 Census.

What is the median household income in Mercer Island, Washington?

The typical household in Mercer Island, Washington earns about $61,572 a year. Half of households make more than that, and half make less.

Is Mercer Island, Washington expensive?

In Mercer Island, Washington, the median home is worth about $332,500, and the typical rent is about $607 a month.

How educated are people in Mercer Island, Washington?

About 60.3% of adults age 25 and over in Mercer Island, Washington hold a bachelor's degree or higher.

What is the poverty rate in Mercer Island, Washington?

About 2.3% of people in Mercer Island, Washington live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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