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2025 Compare Cities People:
Mill Valley, CA vs Mercer Island, WA

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Highlights
- Mercer Island is 0% more densely populated than Mill Valley.
- People are 15.4% more likely to be married in Mercer Island.
- The Median Age is 2.4 years younger in Mercer Island.
 Mill Valley, CAMercer Island, WAUnited States
 Population  Unlock25,506329,725,481
 Female Population52.5%  Unlock50.5%
 Male Population47.5%  Unlock49.5%
 Median Age  Unlock45.538.4
 space3
 Population - 201013,934  Unlock309,327,143
 Population - 2000  Unlock22,036285,036,114
 Population - 199013,038  Unlock251,960,433
 Pop. 2000 to Now  Unlock17.6%15.6%
 Pop. 1990 to Now9.9%  Unlock30.8%
 space4
 Population Density  Unlock3,995.993.4
 Land Area4.8  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Mill Valley, CAMercer Island, WAUnited States
 Age 0 to 42.9%  Unlock5.9%
 Age 5 to 9  Unlock7.3%6.1%
 Age 10 to 146.3%  Unlock6.6%
 Age 15 to 17  Unlock4.3%3.9%
 Age 18 to 203.4%  Unlock4.0%
 Age 21 to 24  Unlock2.9%5.2%
 Age 25 to 347.3%  Unlock13.8%
 Age 35 to 44  Unlock11.8%12.9%
 Age 45 to 5418.4%  Unlock12.6%
 Age 55 to 59  Unlock7.9%6.7%
 Age 60 to 647.1%  Unlock6.3%
 Age 65 to 74  Unlock10.4%9.6%
 Age 75 to 846.5%  Unlock4.5%
 Age 85 and over  Unlock3.8%1.9%
 space1
 Race
 Mill Valley, CAMercer Island, WAUnited States
 White83.0%  Unlock59.4%
 Black  Unlock0.8%12.2%
 Asian6.1%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.7%0.4%
 Two or More Races5.4%  Unlock3.2%
 Hispanic  Unlock3.2%18.4%
 space2
 Marriage & Family
 Mill Valley, CAMercer Island, WAUnited States
 Married Population56.1%  Unlock49.8%
     Currently Married  Unlock64.3%48.0%
 Married but Separated0.5%  Unlock1.8%
 Single Population  Unlock35.3%50.2%
 Never Married26.9%  Unlock33.8%
 Divorced  Unlock7.9%10.8%
 Widowed4.5%  Unlock5.6%
 space5
 Household Size  Unlock2.602.60
 Households5,622  Unlock124,010,992
 Family Households  Unlock6,90380,755,759
     Married couple, w/children35.2%  Unlock30.5%
     Married couple, no children  Unlock48.1%42.9%
 Non Family Households1,808  Unlock43,255,233
     Single householder, w/children  Unlock4.6%15.8%
     Single householder, no children5.6%  Unlock10.8%
Voting
Reviews for Mill Valley    7 Reviews
Thomas · Chatham, NJ
Mill Valley Tiburon wonderful
Over 4 years ago

I lived in southern Marin County for 20 years and lived it. Just moved  More

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chris · Mill Valley, CA
Pristine and Costly
Over 15 years ago

Mill Valley is a perfect place to live and raise a family, if you don't mind a cost of living index of 233. Don't distress - go mountain biking or hiking with  More

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Robbin · Mill Valley, CA
California
Over 16 years ago

Good weather all year around. Great public schools. Cost of living very high. Crime low wonderful outdoor activities nearby like hiking, beaches,  More

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Reviews for Mercer Island    4 Reviews
Megan · Mercer Island, WA
Nice place to live with great schools
Over 17 years ago

Mercer Island is a wonderful family community. It feels much more "small town" than a city even though it has a population of 20,000+. People say hello and watch out  More

   |    Reply
A resident · Mercer Island, WA
Mercer Island - Is there a "there" there?
Over 17 years ago

Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  More

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A resident · Mercer Island, WA
Mercer Island, WA - a suburb on an island
Over 17 years ago

Mercer Island is a suburb of Seattle, located on an island in Lake Washington. The best thing about Mercer Island is its strategically central location relative to the  More

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Learn More About Mill Valley, California
Overview
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Learn More About Mercer Island, Washington
Overview
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