2025 Compare Cities People:
Boulder, CO vs Thornton, CO

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Highlights
- Thornton is 0% more densely populated than Boulder.
- People are 68.0% more likely to be married in Thornton.
- The Median Age is 4.8 years older in Thornton.
 Boulder, COThornton, COUnited States
 Population  Unlock140,538329,725,481
 Female Population48.5%  Unlock50.5%
 Male Population51.5%  Unlock49.5%
 Median Age  Unlock33.738.4
 space3
 Population - 201097,724  Unlock309,327,143
 Population - 2000  Unlock82,384285,036,114
 Population - 199083,312  Unlock251,960,433
 Pop. 2000 to Now  Unlock79.8%15.6%
 Pop. 1990 to Now29.2%  Unlock30.8%
 space4
 Population Density  Unlock3,980.693.4
 Land Area26.3  Unlock3,531,905.4
 Water Area  Unlock2.0264,836.8
 space
 Est. Total Population By Age
 Boulder, COThornton, COUnited States
 Age 0 to 42.7%  Unlock5.9%
 Age 5 to 9  Unlock7.2%6.1%
 Age 10 to 143.6%  Unlock6.6%
 Age 15 to 17  Unlock4.4%3.9%
 Age 18 to 2016.2%  Unlock4.0%
 Age 21 to 24  Unlock5.5%5.2%
 Age 25 to 3416.3%  Unlock13.8%
 Age 35 to 44  Unlock15.2%12.9%
 Age 45 to 5410.3%  Unlock12.6%
 Age 55 to 59  Unlock5.9%6.7%
 Age 60 to 644.2%  Unlock6.3%
 Age 65 to 74  Unlock6.4%9.6%
 Age 75 to 843.1%  Unlock4.5%
 Age 85 and over  Unlock0.7%1.9%
 space1
 Race
 Boulder, COThornton, COUnited States
 White78.3%  Unlock59.4%
 Black  Unlock1.8%12.2%
 Asian5.9%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.3%0.4%
 Two or More Races3.5%  Unlock3.2%
 Hispanic  Unlock36.7%18.4%
 space2
 Marriage & Family
 Boulder, COThornton, COUnited States
 Married Population31.9%  Unlock49.8%
     Currently Married  Unlock52.4%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock46.3%50.2%
 Never Married56.1%  Unlock33.8%
 Divorced  Unlock10.5%10.8%
 Widowed2.5%  Unlock5.6%
 space5
 Household Size  Unlock2.942.60
 Households42,610  Unlock124,010,992
 Family Households  Unlock34,01580,755,759
     Married couple, w/children33.3%  Unlock30.5%
     Married couple, no children  Unlock35.8%42.9%
 Non Family Households25,269  Unlock43,255,233
     Single householder, w/children  Unlock15.7%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 Thornton    5 Reviews

Good place. Very suburbany (similar to the Springs). The houses are very small and old and yet still very expensive (albeit cheaper than southern Denver). Actually lots  More

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Over 5 years ago

I like Denver metro, but some cities aren’t too great. Thornton being one of them. Moved here because of highway access, and convenience to DIA for business travel. Am  More

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Over 10 years ago

The quality of life here in not good. The traffic is bad all the time. To try to get to the mountains takes forever! Also most lakes along the front range you can't even  More

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