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

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Highlights
- Petaluma is 0% more densely populated than Boulder.
- People are 67.1% more likely to be married in Petaluma.
- The Median Age is 13.9 years older in Petaluma.
 Boulder, COPetaluma, CAUnited States
 Population  Unlock60,050329,725,481
 Female Population48.5%  Unlock50.5%
 Male Population51.5%  Unlock49.5%
 Median Age  Unlock42.838.4
 space3
 Population - 201097,724  Unlock309,327,143
 Population - 2000  Unlock54,548285,036,114
 Population - 199083,312  Unlock251,960,433
 Pop. 2000 to Now  Unlock11.2%15.6%
 Pop. 1990 to Now29.2%  Unlock30.8%
 space4
 Population Density  Unlock4,175.493.4
 Land Area26.3  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Boulder, COPetaluma, CAUnited States
 Age 0 to 42.7%  Unlock5.9%
 Age 5 to 9  Unlock5.5%6.1%
 Age 10 to 143.6%  Unlock6.6%
 Age 15 to 17  Unlock4.0%3.9%
 Age 18 to 2016.2%  Unlock4.0%
 Age 21 to 24  Unlock3.0%5.2%
 Age 25 to 3416.3%  Unlock13.8%
 Age 35 to 44  Unlock13.7%12.9%
 Age 45 to 5410.3%  Unlock12.6%
 Age 55 to 59  Unlock7.4%6.7%
 Age 60 to 644.2%  Unlock6.3%
 Age 65 to 74  Unlock11.1%9.6%
 Age 75 to 843.1%  Unlock4.5%
 Age 85 and over  Unlock2.6%1.9%
 space1
 Race
 Boulder, COPetaluma, CAUnited States
 White78.3%  Unlock59.4%
 Black  Unlock1.3%12.2%
 Asian5.9%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races3.5%  Unlock3.2%
 Hispanic  Unlock21.6%18.4%
 space2
 Marriage & Family
 Boulder, COPetaluma, CAUnited States
 Married Population31.9%  Unlock49.8%
     Currently Married  Unlock51.8%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock46.6%50.2%
 Never Married56.1%  Unlock33.8%
 Divorced  Unlock11.6%10.8%
 Widowed2.5%  Unlock5.6%
 space5
 Household Size  Unlock2.612.60
 Households42,610  Unlock124,010,992
 Family Households  Unlock15,05980,755,759
     Married couple, w/children33.3%  Unlock30.5%
     Married couple, no children  Unlock45.5%42.9%
 Non Family Households25,269  Unlock43,255,233
     Single householder, w/children  Unlock11.6%15.8%
     Single householder, no children8.5%  Unlock10.8%
Reviews for Boulder    55 Reviews

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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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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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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Reviews for Petaluma    16 Reviews

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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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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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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