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2025 Compare Cities People:
Rapid City, SD vs Mercer Island, WA

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Highlights
- Mercer Island is 0% more densely populated than Rapid City.
- People are 41.0% more likely to be married in Mercer Island.
- The Median Age is 7.4 years older in Mercer Island.
 Rapid City, SDMercer Island, WAUnited States
 Population  Unlock25,506329,725,481
 Female Population49.6%  Unlock50.5%
 Male Population50.4%  Unlock49.5%
 Median Age  Unlock45.538.4
 space3
 Population - 201069,138  Unlock309,327,143
 Population - 2000  Unlock22,036285,036,114
 Population - 199054,523  Unlock251,960,433
 Pop. 2000 to Now  Unlock17.6%15.6%
 Pop. 1990 to Now44.6%  Unlock30.8%
 space4
 Population Density  Unlock3,995.993.4
 Land Area54.5  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Rapid City, SDMercer Island, WAUnited States
 Age 0 to 46.7%  Unlock5.9%
 Age 5 to 9  Unlock7.3%6.1%
 Age 10 to 146.4%  Unlock6.6%
 Age 15 to 17  Unlock4.3%3.9%
 Age 18 to 203.7%  Unlock4.0%
 Age 21 to 24  Unlock2.9%5.2%
 Age 25 to 3414.0%  Unlock13.8%
 Age 35 to 44  Unlock11.8%12.9%
 Age 45 to 5410.6%  Unlock12.6%
 Age 55 to 59  Unlock7.9%6.7%
 Age 60 to 646.5%  Unlock6.3%
 Age 65 to 74  Unlock10.4%9.6%
 Age 75 to 845.1%  Unlock4.5%
 Age 85 and over  Unlock3.8%1.9%
 space1
 Race
 Rapid City, SDMercer Island, WAUnited States
 White77.0%  Unlock59.4%
 Black  Unlock0.8%12.2%
 Asian1.3%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.7%0.4%
 Two or More Races5.6%  Unlock3.2%
 Hispanic  Unlock3.2%18.4%
 space2
 Marriage & Family
 Rapid City, SDMercer Island, WAUnited States
 Married Population45.9%  Unlock49.8%
     Currently Married  Unlock64.3%48.0%
 Married but Separated1.2%  Unlock1.8%
 Single Population  Unlock35.3%50.2%
 Never Married32.5%  Unlock33.8%
 Divorced  Unlock7.9%10.8%
 Widowed6.6%  Unlock5.6%
 space5
 Household Size  Unlock2.602.60
 Households30,737  Unlock124,010,992
 Family Households  Unlock6,90380,755,759
     Married couple, w/children27.2%  Unlock30.5%
     Married couple, no children  Unlock48.1%42.9%
 Non Family Households13,767  Unlock43,255,233
     Single householder, w/children  Unlock4.6%15.8%
     Single householder, no children8.1%  Unlock10.8%
Voting
Reviews for Rapid City    31 Reviews
PJ · Amarillo, TX
Don't let the name City deceive you. It's a Town!!
Over 1 years ago

I have lived in this city for the last three and half years and I can't stand it!! Let me spell it out for you, but to be fair, let me give you the Pros first:  More

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Jacob · Eugene, OR
Black Hills are beautiful in summer.
Over 4 years ago

Unless you made your pension out of state or already bought a home you can't afford to liver there. Rapid City is gray in winter.  More

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Dee · Beverly Hills, CA
Title
Over 4 years ago

I've lived in the city 5 years a loved  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 Rapid City, South Dakota
Overview
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Learn More About Mercer Island, Washington
Overview
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