2025 Compare Cities People:
Janesville, WI vs Decatur, IL

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Highlights
- Decatur is 0% more densely populated than Janesville.
- People are 12.7% less likely to be married in Decatur.
- The Median Age is 0.2 years older in Decatur.
 Janesville, WIDecatur, ILUnited States
 Population  Unlock71,309329,725,481
 Female Population51.1%  Unlock50.5%
 Male Population48.9%  Unlock49.5%
 Median Age  Unlock39.938.4
 space3
 Population - 201063,632  Unlock309,327,143
 Population - 2000  Unlock81,860285,036,114
 Population - 199052,133  Unlock251,960,433
 Pop. 2000 to Now  Unlock-14.5%15.6%
 Pop. 1990 to Now24.0%  Unlock30.8%
 space4
 Population Density  Unlock1,685.093.4
 Land Area34.0  Unlock3,531,905.4
 Water Area  Unlock4.7264,836.8
 space
 Est. Total Population By Age
 Janesville, WIDecatur, ILUnited States
 Age 0 to 45.1%  Unlock5.9%
 Age 5 to 9  Unlock5.5%6.1%
 Age 10 to 146.9%  Unlock6.6%
 Age 15 to 17  Unlock3.7%3.9%
 Age 18 to 202.9%  Unlock4.0%
 Age 21 to 24  Unlock5.2%5.2%
 Age 25 to 3412.7%  Unlock13.8%
 Age 35 to 44  Unlock11.3%12.9%
 Age 45 to 5412.6%  Unlock12.6%
 Age 55 to 59  Unlock7.0%6.7%
 Age 60 to 646.9%  Unlock6.3%
 Age 65 to 74  Unlock11.1%9.6%
 Age 75 to 845.0%  Unlock4.5%
 Age 85 and over  Unlock3.3%1.9%
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 Race
 Janesville, WIDecatur, ILUnited States
 White86.8%  Unlock59.4%
 Black  Unlock23.0%12.2%
 Asian1.7%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.1%0.4%
 Two or More Races2.5%  Unlock3.2%
 Hispanic  Unlock2.8%18.4%
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 Marriage & Family
 Janesville, WIDecatur, ILUnited States
 Married Population48.7%  Unlock49.8%
     Currently Married  Unlock41.1%48.0%
 Married but Separated1.2%  Unlock1.8%
 Single Population  Unlock57.5%50.2%
 Never Married30.6%  Unlock33.8%
 Divorced  Unlock14.0%10.8%
 Widowed6.3%  Unlock5.6%
 space5
 Household Size  Unlock2.212.60
 Households27,743  Unlock124,010,992
 Family Households  Unlock16,33580,755,759
     Married couple, w/children26.5%  Unlock30.5%
     Married couple, no children  Unlock48.1%42.9%
 Non Family Households10,937  Unlock43,255,233
     Single householder, w/children  Unlock20.0%15.8%
     Single householder, no children10.2%  Unlock10.8%
Reviews for Janesville    12 Reviews

Beautiful City - on an Ice Age Trail. I moved here during the Covid thing so it is hard to tell how friendly people are. The government seems closed - encouraged by  More

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My Wife and I have lived here for the last 2 years. Janesville is the pit of Hell. Nothing to do here, especially during the winter time. Closest places are 45 min to  More

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Janesville has pros and cons to living here depending on what is important to you. Janesville has a cheap cost of living and liberal-below average schools. Since you can  More

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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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