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2025 Compare Cities People:
Decatur, IL vs St. John, IN

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Highlights
- St. John is 0% more densely populated than Decatur.
- People are 55.2% more likely to be married in St. John.
- The Median Age is 2.0 years older in St. John.
 Decatur, ILSt. John, INUnited States
 Population  Unlock19,805329,725,481
 Female Population52.7%  Unlock50.5%
 Male Population47.3%  Unlock49.5%
 Median Age  Unlock41.938.4
 space3
 Population - 201076,095  Unlock309,327,143
 Population - 2000  Unlock8,382285,036,114
 Population - 199083,885  Unlock251,960,433
 Pop. 2000 to Now  Unlock134.0%15.6%
 Pop. 1990 to Now-16.5%  Unlock30.8%
 space4
 Population Density  Unlock1,577.793.4
 Land Area42.3  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Decatur, ILSt. John, INUnited States
 Age 0 to 46.0%  Unlock5.9%
 Age 5 to 9  Unlock5.3%6.1%
 Age 10 to 145.7%  Unlock6.6%
 Age 15 to 17  Unlock4.8%3.9%
 Age 18 to 204.7%  Unlock4.0%
 Age 21 to 24  Unlock4.2%5.2%
 Age 25 to 3413.2%  Unlock13.8%
 Age 35 to 44  Unlock13.7%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  Unlock10.1%9.6%
 Age 75 to 845.7%  Unlock4.5%
 Age 85 and over  Unlock1.1%1.9%
 space1
 Race
 Decatur, ILSt. John, INUnited States
 White67.5%  Unlock59.4%
 Black  Unlock2.6%12.2%
 Asian1.4%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock2.3%0.4%
 Two or More Races4.9%  Unlock3.2%
 Hispanic  Unlock11.1%18.4%
 space2
 Marriage & Family
 Decatur, ILSt. John, INUnited States
 Married Population42.5%  Unlock49.8%
     Currently Married  Unlock65.4%48.0%
 Married but Separated1.4%  Unlock1.8%
 Single Population  Unlock34.0%50.2%
 Never Married35.7%  Unlock33.8%
 Divorced  Unlock5.3%10.8%
 Widowed7.8%  Unlock5.6%
 space5
 Household Size  Unlock2.872.60
 Households30,718  Unlock124,010,992
 Family Households  Unlock5,62980,755,759
     Married couple, w/children20.5%  Unlock30.5%
     Married couple, no children  Unlock46.5%42.9%
 Non Family Households14,383  Unlock43,255,233
     Single householder, w/children  Unlock5.6%15.8%
     Single householder, no children11.4%  Unlock10.8%
Voting
Reviews for Decatur    14 Reviews
Ray · Decatur, IL
Hot in the summer; cold, windy, and cloudy in the
Over 12 years ago

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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Bp · Tucson, AZ
Has Changed not for the Better!!!
Over 13 years ago

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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David  · Decatur, IL
Drive-thru liquor windows
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 St. John    1 Reviews
Cassady · St. John, IN
The worst place on Earth!!!!!!!
Over 14 years ago

I moved here 2yrs ago from Rockford, IL(which is ranked number 14 most miserable cities in America) and I hate this town more then anywhere I've ever been in my whole  More

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