2025 Compare Cities People:
Decatur, IL vs Waterloo, IA

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Highlights
- Waterloo is 0% more densely populated than Decatur.
- People are 7.2% more likely to be married in Waterloo.
- The Median Age is 3.1 years younger in Waterloo.
 Decatur, ILWaterloo, IAUnited States
 Population  Unlock67,695329,725,481
 Female Population52.7%  Unlock50.5%
 Male Population47.3%  Unlock49.5%
 Median Age  Unlock36.838.4
 space3
 Population - 201076,095  Unlock309,327,143
 Population - 2000  Unlock68,747285,036,114
 Population - 199083,885  Unlock251,960,433
 Pop. 2000 to Now  Unlock-2.1%15.6%
 Pop. 1990 to Now-16.5%  Unlock30.8%
 space4
 Population Density  Unlock1,100.993.4
 Land Area42.3  Unlock3,531,905.4
 Water Area  Unlock1.7264,836.8
 space
 Est. Total Population By Age
 Decatur, ILWaterloo, IAUnited States
 Age 0 to 46.0%  Unlock5.9%
 Age 5 to 9  Unlock6.6%6.1%
 Age 10 to 145.7%  Unlock6.6%
 Age 15 to 17  Unlock4.0%3.9%
 Age 18 to 204.7%  Unlock4.0%
 Age 21 to 24  Unlock5.8%5.2%
 Age 25 to 3413.2%  Unlock13.8%
 Age 35 to 44  Unlock12.4%12.9%
 Age 45 to 5410.8%  Unlock12.6%
 Age 55 to 59  Unlock6.0%6.7%
 Age 60 to 646.8%  Unlock6.3%
 Age 65 to 74  Unlock9.8%9.6%
 Age 75 to 845.7%  Unlock4.5%
 Age 85 and over  Unlock2.1%1.9%
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 Race
 Decatur, ILWaterloo, IAUnited States
 White67.5%  Unlock59.4%
 Black  Unlock17.1%12.2%
 Asian1.4%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.1%0.4%
 Two or More Races4.9%  Unlock3.2%
 Hispanic  Unlock7.1%18.4%
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 Marriage & Family
 Decatur, ILWaterloo, IAUnited States
 Married Population42.5%  Unlock49.8%
     Currently Married  Unlock43.8%48.0%
 Married but Separated1.4%  Unlock1.8%
 Single Population  Unlock54.5%50.2%
 Never Married35.7%  Unlock33.8%
 Divorced  Unlock11.6%10.8%
 Widowed7.8%  Unlock5.6%
 space5
 Household Size  Unlock2.312.60
 Households30,718  Unlock124,010,992
 Family Households  Unlock16,79880,755,759
     Married couple, w/children20.5%  Unlock30.5%
     Married couple, no children  Unlock41.6%42.9%
 Non Family Households14,383  Unlock43,255,233
     Single householder, w/children  Unlock22.6%15.8%
     Single householder, no children11.4%  Unlock10.8%
Reviews for Decatur    14 Reviews

I was sent here by the company I worked for in the '90's and was not initially impressed with midwest living. However, over the years I got used to living in the "Pride  More

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I grew up in Decatur and I still have family there, but it depresses me to see what it has become. It has a high unemployment rate, many business have closed or are run  More

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Over 14 years ago

If you enjoy drinking & driving, Decatur's fifteen drive-thru liquor windows, three times the # of drive-thru's than the ten largest cities in Illinois, COMBINED, will  More

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Reviews for Waterloo    5 Reviews

The bike racks recently installed on the MET buses was a great idea for a community that has numerous bike riders and  More

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Over 17 years ago

Unless you're into getting wasted on a regular basis there's not a lot to do here. Most people barhop for fun. Being someone who doesn't drink and doesn't enjoy being  More

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Over 17 years ago

So the weather is emotional here - on and off during the summer its hot and rainy, yet during the fall it is quite often beautiful. Winters can be long, and spring can  More

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