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2025 Compare Cities People:
Mercer Island, WA vs Marco Island, FL

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Highlights
- Marco Island is 0% more densely populated than Mercer Island.
- People are 16.6% more likely to be married in Marco Island.
- The Median Age is 21.4 years older in Marco Island.
 Mercer Island, WAMarco Island, FLUnited States
 Population  Unlock15,929329,725,481
 Female Population52.9%  Unlock50.5%
 Male Population47.1%  Unlock49.5%
 Median Age  Unlock66.938.4
 space3
 Population - 201022,770  Unlock309,327,143
 Population - 2000  Unlock15,068285,036,114
 Population - 199020,816  Unlock251,960,433
 Pop. 2000 to Now  Unlock20.1%15.6%
 Pop. 1990 to Now24.5%  Unlock30.8%
 space4
 Population Density  Unlock1,310.293.4
 Land Area6.4  Unlock3,531,905.4
 Water Area  Unlock12.5264,836.8
 space
 Est. Total Population By Age
 Mercer Island, WAMarco Island, FLUnited States
 Age 0 to 43.8%  Unlock5.9%
 Age 5 to 9  Unlock2.1%6.1%
 Age 10 to 148.2%  Unlock6.6%
 Age 15 to 17  Unlock1.5%3.9%
 Age 18 to 202.5%  Unlock4.0%
 Age 21 to 24  Unlock2.0%5.2%
 Age 25 to 348.2%  Unlock13.8%
 Age 35 to 44  Unlock4.2%12.9%
 Age 45 to 5416.9%  Unlock12.6%
 Age 55 to 59  Unlock7.4%6.7%
 Age 60 to 646.5%  Unlock6.3%
 Age 65 to 74  Unlock25.6%9.6%
 Age 75 to 845.5%  Unlock4.5%
 Age 85 and over  Unlock7.8%1.9%
 space1
 Race
 Mercer Island, WAMarco Island, FLUnited States
 White66.8%  Unlock59.4%
 Black  Unlock0.4%12.2%
 Asian21.3%  Unlock5.6%
 Native American  Unlock0.0%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races6.9%  Unlock3.2%
 Hispanic  Unlock8.3%18.4%
 space2
 Marriage & Family
 Mercer Island, WAMarco Island, FLUnited States
 Married Population64.7%  Unlock49.8%
     Currently Married  Unlock74.7%48.0%
 Married but Separated0.4%  Unlock1.8%
 Single Population  Unlock24.5%50.2%
 Never Married21.7%  Unlock33.8%
 Divorced  Unlock6.7%10.8%
 Widowed5.8%  Unlock5.6%
 space5
 Household Size  Unlock1.962.60
 Households9,758  Unlock124,010,992
 Family Households  Unlock5,73680,755,759
     Married couple, w/children42.3%  Unlock30.5%
     Married couple, no children  Unlock86.1%42.9%
 Non Family Households2,855  Unlock43,255,233
     Single householder, w/children  Unlock1.5%15.8%
     Single householder, no children5.0%  Unlock10.8%
Voting
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

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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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Reviews for Marco Island    3 Reviews
Lani · San Diego, CA
Absolute Paradise (island life)
Over 4 years ago

We just purchased a home here from San Diego, Ca. Marco island is so refreshing! It is Clean, no trash, people care about their yards and community with impeccable  More

   |    Reply
Kathryn · Marco Island, FL
Great Place to Retire To
Over 8 years ago

We moved here upon retirement and have been delighted with our new community. With canals crisscrossing the entire island, most homesites are on the water, and we enjoy  More

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Ernie  · Homestead, FL
Outsiders not welcomed at Marco Island
Over 9 years ago

I have been coming to Marco Island for the past couple of years to spend the 4th of July with my family in this beautiful city, but never again. From what we learned  More

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Learn More About Mercer Island, Washington
Overview
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Learn More About Marco Island, Florida
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