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2025 Compare Cities People:
Boulder, CO vs Arnold, MO

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Highlights
- Arnold is 0% more densely populated than Boulder.
- People are 67.2% more likely to be married in Arnold.
- The Median Age is 13.3 years older in Arnold.
 Boulder, COArnold, MOUnited States
 Population  Unlock20,808329,725,481
 Female Population48.5%  Unlock50.5%
 Male Population51.5%  Unlock49.5%
 Median Age  Unlock42.238.4
 space3
 Population - 201097,724  Unlock309,327,143
 Population - 2000  Unlock19,965285,036,114
 Population - 199083,312  Unlock251,960,433
 Pop. 2000 to Now  Unlock5.9%15.6%
 Pop. 1990 to Now29.2%  Unlock30.8%
 space4
 Population Density  Unlock1,796.493.4
 Land Area26.3  Unlock3,531,905.4
 Water Area  Unlock0.4264,836.8
 space
 Est. Total Population By Age
 Boulder, COArnold, MOUnited States
 Age 0 to 42.7%  Unlock5.9%
 Age 5 to 9  Unlock5.8%6.1%
 Age 10 to 143.6%  Unlock6.6%
 Age 15 to 17  Unlock4.8%3.9%
 Age 18 to 2016.2%  Unlock4.0%
 Age 21 to 24  Unlock2.8%5.2%
 Age 25 to 3416.3%  Unlock13.8%
 Age 35 to 44  Unlock11.0%12.9%
 Age 45 to 5410.3%  Unlock12.6%
 Age 55 to 59  Unlock8.3%6.7%
 Age 60 to 644.2%  Unlock6.3%
 Age 65 to 74  Unlock10.3%9.6%
 Age 75 to 843.1%  Unlock4.5%
 Age 85 and over  Unlock2.2%1.9%
 space1
 Race
 Boulder, COArnold, MOUnited States
 White78.3%  Unlock59.4%
 Black  Unlock0.4%12.2%
 Asian5.9%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races3.5%  Unlock3.2%
 Hispanic  Unlock2.4%18.4%
 space2
 Marriage & Family
 Boulder, COArnold, MOUnited States
 Married Population31.9%  Unlock49.8%
     Currently Married  Unlock50.5%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock46.6%50.2%
 Never Married56.1%  Unlock33.8%
 Divorced  Unlock13.4%10.8%
 Widowed2.5%  Unlock5.6%
 space5
 Household Size  Unlock2.462.60
 Households42,610  Unlock124,010,992
 Family Households  Unlock5,53080,755,759
     Married couple, w/children33.3%  Unlock30.5%
     Married couple, no children  Unlock43.2%42.9%
 Non Family Households25,269  Unlock43,255,233
     Single householder, w/children  Unlock17.8%15.8%
     Single householder, no children8.5%  Unlock10.8%
Voting
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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Reviews for Arnold    1 Reviews
JT · Clermont, FL
Newly transplanted here!
Over 16 years ago

My husband's family lives in the area (Crestwood, Barnhart, Fenton, Ballwin), we have been visiting for about 20 years. We moved from a southern state which had it  More

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Learn More About Boulder, Colorado
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