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2025 Compare Cities People:
Petaluma, CA vs Boulder, CO

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Highlights
- Boulder is 0% more densely populated than Petaluma.
- People are 40.2% less likely to be married in Boulder.
- The Median Age is 13.9 years younger in Boulder.
 Petaluma, CABoulder, COUnited States
 Population  Unlock104,930329,725,481
 Female Population50.1%  Unlock50.5%
 Male Population49.9%  Unlock49.5%
 Median Age  Unlock28.938.4
 space3
 Population - 201058,048  Unlock309,327,143
 Population - 2000  Unlock94,673285,036,114
 Population - 199043,184  Unlock251,960,433
 Pop. 2000 to Now  Unlock13.7%15.6%
 Pop. 1990 to Now40.4%  Unlock30.8%
 space4
 Population Density  Unlock3,991.493.4
 Land Area14.4  Unlock3,531,905.4
 Water Area  Unlock1.0264,836.8
 space
 Est. Total Population By Age
 Petaluma, CABoulder, COUnited States
 Age 0 to 45.0%  Unlock5.9%
 Age 5 to 9  Unlock3.7%6.1%
 Age 10 to 146.1%  Unlock6.6%
 Age 15 to 17  Unlock2.5%3.9%
 Age 18 to 203.1%  Unlock4.0%
 Age 21 to 24  Unlock13.8%5.2%
 Age 25 to 3412.7%  Unlock13.8%
 Age 35 to 44  Unlock10.3%12.9%
 Age 45 to 5413.5%  Unlock12.6%
 Age 55 to 59  Unlock4.5%6.7%
 Age 60 to 647.3%  Unlock6.3%
 Age 65 to 74  Unlock7.0%9.6%
 Age 75 to 845.0%  Unlock4.5%
 Age 85 and over  Unlock1.8%1.9%
 space1
 Race
 Petaluma, CABoulder, COUnited States
 White68.1%  Unlock59.4%
 Black  Unlock1.0%12.2%
 Asian4.1%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.3%0.4%
 Two or More Races4.4%  Unlock3.2%
 Hispanic  Unlock10.6%18.4%
 space2
 Marriage & Family
 Petaluma, CABoulder, COUnited States
 Married Population53.4%  Unlock49.8%
     Currently Married  Unlock31.2%48.0%
 Married but Separated1.5%  Unlock1.8%
 Single Population  Unlock68.1%50.2%
 Never Married30.0%  Unlock33.8%
 Divorced  Unlock9.5%10.8%
 Widowed5.0%  Unlock5.6%
 space5
 Household Size  Unlock2.212.60
 Households22,756  Unlock124,010,992
 Family Households  Unlock17,34180,755,759
     Married couple, w/children34.8%  Unlock30.5%
     Married couple, no children  Unlock47.4%42.9%
 Non Family Households7,697  Unlock43,255,233
     Single householder, w/children  Unlock10.8%15.8%
     Single householder, no children8.1%  Unlock10.8%
Voting
Reviews for Petaluma    16 Reviews
Chris · Petaluma, CA
Old hippies are in charge
Over 4 years ago

I agree with the low star reviews. Been here for 25 years, raised a family and seen everything turn to the left and worse. Weather is glorious, love the old Victorians  More

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O · Petaluma, CA
A great place to call home, if you can afford it
Over 4 years ago

We’ve lived here for 3 years and we love it. It has taken some time to grow on us. We moved from SF where we had lived over 15 years, we were not used to one year leases  More

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Ima · Petaluma, CA
California living at its finest!
Over 4 years ago

I’ve lived here a couple of years (after living in others parts of the Bay Area for 15+ years) and I love it! Great neighborhoods, friendly folks, good schools with  More

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Reviews for Boulder    55 Reviews
Guess · Boulder, CO
Expensive and requires liking a unique culture
Over 4 years ago

Outside of the university, Boulder had a very distinctive "wealthy hippy" feel. A lot of alternative medicine and a matching ethos. This is changing some among my  More

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Linda · Boulder, CO
I love it here! Such a beautiful and friendly city
Over 5 years ago

We moved here from Texas about 4 years ago and love it here! The amazing sense of community and high regard for the environment are two of the main reasons we love  More

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H · Denver, CO
Snob says it's ok
Over 5 years ago

Most people do much worse than Boulder. I'm the most critical person I've ever met who is never happy or satisfied -- so that's a pretty huge compliment.   More

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Learn More About Petaluma, California
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