2025 Compare Cities People:
Sioux City, IA vs Boulder, CO

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Highlights
- Boulder is 0% more densely populated than Sioux City.
- People are 32.2% less likely to be married in Boulder.
- The Median Age is 5.9 years younger in Boulder.
 Sioux City, IABoulder, COUnited States
 Population  Unlock104,930329,725,481
 Female Population50.0%  Unlock50.5%
 Male Population50.0%  Unlock49.5%
 Median Age  Unlock28.938.4
 space3
 Population - 201082,855  Unlock309,327,143
 Population - 2000  Unlock94,673285,036,114
 Population - 199080,505  Unlock251,960,433
 Pop. 2000 to Now  Unlock13.7%15.6%
 Pop. 1990 to Now2.8%  Unlock30.8%
 space4
 Population Density  Unlock3,991.493.4
 Land Area58.4  Unlock3,531,905.4
 Water Area  Unlock1.0264,836.8
 space
 Est. Total Population By Age
 Sioux City, IABoulder, COUnited States
 Age 0 to 47.3%  Unlock5.9%
 Age 5 to 9  Unlock3.7%6.1%
 Age 10 to 147.4%  Unlock6.6%
 Age 15 to 17  Unlock2.5%3.9%
 Age 18 to 205.1%  Unlock4.0%
 Age 21 to 24  Unlock13.8%5.2%
 Age 25 to 3413.0%  Unlock13.8%
 Age 35 to 44  Unlock10.3%12.9%
 Age 45 to 5411.8%  Unlock12.6%
 Age 55 to 59  Unlock4.5%6.7%
 Age 60 to 645.5%  Unlock6.3%
 Age 65 to 74  Unlock7.0%9.6%
 Age 75 to 843.9%  Unlock4.5%
 Age 85 and over  Unlock1.8%1.9%
 space1
 Race
 Sioux City, IABoulder, COUnited States
 White65.0%  Unlock59.4%
 Black  Unlock1.0%12.2%
 Asian2.9%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.5%  Unlock0.2%
 Other  Unlock0.3%0.4%
 Two or More Races4.1%  Unlock3.2%
 Hispanic  Unlock10.6%18.4%
 space2
 Marriage & Family
 Sioux City, IABoulder, COUnited States
 Married Population47.1%  Unlock49.8%
     Currently Married  Unlock31.2%48.0%
 Married but Separated2.0%  Unlock1.8%
 Single Population  Unlock68.1%50.2%
 Never Married35.8%  Unlock33.8%
 Divorced  Unlock9.5%10.8%
 Widowed5.1%  Unlock5.6%
 space5
 Household Size  Unlock2.212.60
 Households32,051  Unlock124,010,992
 Family Households  Unlock17,34180,755,759
     Married couple, w/children29.9%  Unlock30.5%
     Married couple, no children  Unlock47.4%42.9%
 Non Family Households11,876  Unlock43,255,233
     Single householder, w/children  Unlock10.8%15.8%
     Single householder, no children9.2%  Unlock10.8%
Reviews for Sioux City    12 Reviews

Over 7 years ago

I’ve been here only 4 months and I’m still shocked at how people behave. Not friendly, rude. Can’t tell you how many businesses I’ve been in to where the reception staff  More

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Climate in winter ranges from 10-15 degrees to 85+ in the summer 7% sale tax population @75,000, economy ok  More

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Over 14 years ago

Sioux City is an amazing place. Low crime rate, Great Schools, Great People, Most People are friendly and Polite. Just an overall great place to live!!!!!!!!!!!   More

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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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