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2026 Compare Cities People:
Mill Valley, CA vs Fountain Hills, AZ

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Highlights
- Fountain Hills is 0% more densely populated than Mill Valley.
- People are 20.4% more likely to be married in Fountain Hills.
- The Median Age is 11.8 years older in Fountain Hills.
 Mill Valley, CAFountain Hills, AZUnited States
 Population  Unlock23,639329,725,481
 Female Population52.5%  Unlock50.5%
 Male Population47.5%  Unlock49.5%
 Median Age  Unlock59.738.4
 space3
 Population - 201013,934  Unlock309,327,143
 Population - 2000  Unlock20,235285,036,114
 Population - 199013,038  Unlock251,960,433
 Pop. 2000 to Now  Unlock28.3%15.6%
 Pop. 1990 to Now9.9%  Unlock30.8%
 space4
 Population Density  Unlock1,165.693.4
 Land Area4.8  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Mill Valley, CAFountain Hills, AZUnited States
 Age 0 to 42.9%  Unlock5.9%
 Age 5 to 9  Unlock3.3%6.1%
 Age 10 to 146.3%  Unlock6.6%
 Age 15 to 17  Unlock1.8%3.9%
 Age 18 to 203.4%  Unlock4.0%
 Age 21 to 24  Unlock1.6%5.2%
 Age 25 to 347.3%  Unlock13.8%
 Age 35 to 44  Unlock9.3%12.9%
 Age 45 to 5418.4%  Unlock12.6%
 Age 55 to 59  Unlock10.2%6.7%
 Age 60 to 647.1%  Unlock6.3%
 Age 65 to 74  Unlock21.8%9.6%
 Age 75 to 846.5%  Unlock4.5%
 Age 85 and over  Unlock4.3%1.9%
 space1
 Race
 Mill Valley, CAFountain Hills, AZUnited States
 White83.0%  Unlock59.4%
 Black  Unlock2.1%12.2%
 Asian6.1%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.1%0.4%
 Two or More Races5.4%  Unlock3.2%
 Hispanic  Unlock3.4%18.4%
 space2
 Marriage & Family
 Mill Valley, CAFountain Hills, AZUnited States
 Married Population56.1%  Unlock49.8%
     Currently Married  Unlock66.6%48.0%
 Married but Separated0.5%  Unlock1.8%
 Single Population  Unlock32.5%50.2%
 Never Married26.9%  Unlock33.8%
 Divorced  Unlock10.4%10.8%
 Widowed4.5%  Unlock5.6%
 space5
 Household Size  Unlock2.152.60
 Households5,622  Unlock124,010,992
 Family Households  Unlock7,56180,755,759
     Married couple, w/children35.2%  Unlock30.5%
     Married couple, no children  Unlock74.7%42.9%
 Non Family Households1,808  Unlock43,255,233
     Single householder, w/children  Unlock4.9%15.8%
     Single householder, no children5.6%  Unlock10.8%
Voting
Reviews for Mill Valley    7 Reviews
Thomas · Chatham, NJ
Mill Valley Tiburon wonderful
Over 5 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 16 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 17 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 Fountain Hills    10 Reviews
Mark · Garden City, ID
Straight Scoop
Over 7 years ago

We live in Boise but are seriously considering a move to Fountain Hills. We have visited FH and it's beautiful...but we are not sure we can do the Summers! In Boise  More

   |    Reply
Steven · Fountain Hills, AZ
best kept secret
Over 9 years ago

We have lived in many cities in the US we moved here 10 yrs ago raised 2 boys and I would not give it up for any other place. move here raise a family and retire  More

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suzanne · Fountain Hills, AZ
Fountain Hills, AZ
Over 13 years ago

Beautiful homes with mountaineous  More

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Learn More About Mill Valley, California
Overview
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