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2026 Compare Cities People:
Derry, NH vs South Beloit, IL

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Highlights
- South Beloit is 0% more densely populated than Derry.
- People are 8.4% more likely to be married in South Beloit.
- The Median Age is 6.9 years younger in South Beloit.
 Derry, NHSouth Beloit, ILUnited States
 Population  Unlock7,943329,725,481
 Female Population52.3%  Unlock50.5%
 Male Population47.7%  Unlock49.5%
 Median Age  Unlock32.138.4
 space3
 Population - 201033,216  Unlock309,327,143
 Population - 2000  Unlock5,397285,036,114
 Population - 199029,603  Unlock251,960,433
 Pop. 2000 to Now  Unlock39.7%15.6%
 Pop. 1990 to Now13.0%  Unlock30.8%
 space4
 Population Density  Unlock1,313.193.4
 Land Area35.6  Unlock3,531,905.4
 Water Area  Unlock0.2264,836.8
 space
 Est. Total Population By Age
 Derry, NHSouth Beloit, ILUnited States
 Age 0 to 45.7%  Unlock5.9%
 Age 5 to 9  Unlock8.9%6.1%
 Age 10 to 144.8%  Unlock6.6%
 Age 15 to 17  Unlock2.9%3.9%
 Age 18 to 204.1%  Unlock4.0%
 Age 21 to 24  Unlock3.7%5.2%
 Age 25 to 3414.2%  Unlock13.8%
 Age 35 to 44  Unlock11.3%12.9%
 Age 45 to 5413.3%  Unlock12.6%
 Age 55 to 59  Unlock5.9%6.7%
 Age 60 to 647.9%  Unlock6.3%
 Age 65 to 74  Unlock6.9%9.6%
 Age 75 to 842.9%  Unlock4.5%
 Age 85 and over  Unlock2.5%1.9%
 space1
 Race
 Derry, NHSouth Beloit, ILUnited States
 White91.3%  Unlock59.4%
 Black  Unlock3.0%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 Races1.5%  Unlock3.2%
 Hispanic  Unlock6.0%18.4%
 space2
 Marriage & Family
 Derry, NHSouth Beloit, ILUnited States
 Married Population52.3%  Unlock49.8%
     Currently Married  Unlock55.1%48.0%
 Married but Separated2.6%  Unlock1.8%
 Single Population  Unlock43.3%50.2%
 Never Married32.6%  Unlock33.8%
 Divorced  Unlock10.9%10.8%
 Widowed5.0%  Unlock5.6%
 space5
 Household Size  Unlock2.462.60
 Households12,956  Unlock124,010,992
 Family Households  Unlock1,82380,755,759
     Married couple, w/children28.9%  Unlock30.5%
     Married couple, no children  Unlock38.7%42.9%
 Non Family Households3,776  Unlock43,255,233
     Single householder, w/children  Unlock7.7%15.8%
     Single householder, no children11.3%  Unlock10.8%
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Learn More About Derry, New Hampshire
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