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2025 Compare Cities People:
Waterloo, IL vs Weldon Spring, MO

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Highlights
- Weldon Spring is 0% more densely populated than Waterloo.
- People are 22.3% more likely to be married in Weldon Spring.
- The Median Age is 15.7 years older in Weldon Spring.
 Waterloo, ILWeldon Spring, MOUnited States
 Population  Unlock5,348329,725,481
 Female Population51.2%  Unlock50.5%
 Male Population48.8%  Unlock49.5%
 Median Age  Unlock56.138.4
 space3
 Population - 20109,970  Unlock309,327,143
 Population - 2000  Unlock5,270285,036,114
 Population - 19905,072  Unlock251,960,433
 Pop. 2000 to Now  Unlock5.2%15.6%
 Pop. 1990 to Now107.7%  Unlock30.8%
 space4
 Population Density  Unlock699.193.4
 Land Area8.1  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Waterloo, ILWeldon Spring, MOUnited States
 Age 0 to 46.7%  Unlock5.9%
 Age 5 to 9  Unlock4.2%6.1%
 Age 10 to 147.6%  Unlock6.6%
 Age 15 to 17  Unlock4.0%3.9%
 Age 18 to 201.7%  Unlock4.0%
 Age 21 to 24  Unlock3.8%5.2%
 Age 25 to 3412.4%  Unlock13.8%
 Age 35 to 44  Unlock8.7%12.9%
 Age 45 to 549.6%  Unlock12.6%
 Age 55 to 59  Unlock12.5%6.7%
 Age 60 to 647.5%  Unlock6.3%
 Age 65 to 74  Unlock11.9%9.6%
 Age 75 to 845.3%  Unlock4.5%
 Age 85 and over  Unlock5.4%1.9%
 space1
 Race
 Waterloo, ILWeldon Spring, MOUnited States
 White95.3%  Unlock59.4%
 Black  Unlock2.5%12.2%
 Asian1.6%  Unlock5.6%
 Native American  Unlock0.0%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races0.7%  Unlock3.2%
 Hispanic  Unlock0.3%18.4%
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 Marriage & Family
 Waterloo, ILWeldon Spring, MOUnited States
 Married Population56.4%  Unlock49.8%
     Currently Married  Unlock68.9%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock31.1%50.2%
 Never Married22.9%  Unlock33.8%
 Divorced  Unlock6.6%10.8%
 Widowed7.3%  Unlock5.6%
 space5
 Household Size  Unlock2.442.60
 Households4,366  Unlock124,010,992
 Family Households  Unlock1,74980,755,759
     Married couple, w/children30.9%  Unlock30.5%
     Married couple, no children  Unlock64.3%42.9%
 Non Family Households1,298  Unlock43,255,233
     Single householder, w/children  Unlock2.7%15.8%
     Single householder, no children7.7%  Unlock10.8%
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Learn More About Waterloo, Illinois
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