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

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Highlights
- Boulder is 0% more densely populated than Altadena.
- People are 35.9% less likely to be married in Boulder.
- The Median Age is 15.0 years younger in Boulder.
 Altadena, CABoulder, COUnited States
 Population  Unlock104,930329,725,481
 Female Population53.0%  Unlock50.5%
 Male Population47.0%  Unlock49.5%
 Median Age  Unlock28.938.4
 space3
 Population - 201045,446  Unlock309,327,143
 Population - 2000  Unlock94,673285,036,114
 Population - 199042,658  Unlock251,960,433
 Pop. 2000 to Now  Unlock13.7%15.6%
 Pop. 1990 to Now4.6%  Unlock30.8%
 space4
 Population Density  Unlock3,991.493.4
 Land Area8.5  Unlock3,531,905.4
 Water Area  Unlock1.0264,836.8
 space
 Est. Total Population By Age
 Altadena, CABoulder, COUnited States
 Age 0 to 45.4%  Unlock5.9%
 Age 5 to 9  Unlock3.7%6.1%
 Age 10 to 145.8%  Unlock6.6%
 Age 15 to 17  Unlock2.5%3.9%
 Age 18 to 202.6%  Unlock4.0%
 Age 21 to 24  Unlock13.8%5.2%
 Age 25 to 3411.8%  Unlock13.8%
 Age 35 to 44  Unlock10.3%12.9%
 Age 45 to 5414.7%  Unlock12.6%
 Age 55 to 59  Unlock4.5%6.7%
 Age 60 to 646.8%  Unlock6.3%
 Age 65 to 74  Unlock7.0%9.6%
 Age 75 to 846.1%  Unlock4.5%
 Age 85 and over  Unlock1.8%1.9%
 space1
 Race
 Altadena, CABoulder, COUnited States
 White39.5%  Unlock59.4%
 Black  Unlock1.0%12.2%
 Asian5.3%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.3%0.4%
 Two or More Races5.6%  Unlock3.2%
 Hispanic  Unlock10.6%18.4%
 space2
 Marriage & Family
 Altadena, CABoulder, COUnited States
 Married Population49.8%  Unlock49.8%
     Currently Married  Unlock31.2%48.0%
 Married but Separated1.8%  Unlock1.8%
 Single Population  Unlock68.1%50.2%
 Never Married32.2%  Unlock33.8%
 Divorced  Unlock9.5%10.8%
 Widowed6.6%  Unlock5.6%
 space5
 Household Size  Unlock2.212.60
 Households14,789  Unlock124,010,992
 Family Households  Unlock17,34180,755,759
     Married couple, w/children28.9%  Unlock30.5%
     Married couple, no children  Unlock47.4%42.9%
 Non Family Households4,036  Unlock43,255,233
     Single householder, w/children  Unlock10.8%15.8%
     Single householder, no children14.7%  Unlock10.8%
Voting
Reviews for Altadena    1 Reviews
Les · Altadena, CA
Altadena: High and Dry in L.A.
Over 15 years ago

I live just above the 1500 foot elevation at the edge of the San Gabriel Mountains in the L.A. suburb of Altadena--just above Pasadena. We're above the low morning fog  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 Altadena, California
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