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2025 Compare Cities People:
Old Greenwich, CT vs Cos Cob, CT

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Highlights
- Cos Cob is 0% more densely populated than Old Greenwich.
- People are 17.0% less likely to be married in Cos Cob.
- The Median Age is 0.5 years older in Cos Cob.
 Old Greenwich, CTCos Cob, CTUnited States
 Population  Unlock7,089329,725,481
 Female Population49.5%  Unlock50.5%
 Male Population50.5%  Unlock49.5%
 Median Age  Unlock41.138.4
 space3
 Population - 20106,568  Unlock309,327,143
 Population - 2000  Unlock6,701285,036,114
 Population - 19905,789  Unlock251,960,433
 Pop. 2000 to Now  Unlock1.8%15.6%
 Pop. 1990 to Now18.1%  Unlock30.8%
 space4
 Population Density  Unlock3,414.793.4
 Land Area2.0  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Old Greenwich, CTCos Cob, CTUnited States
 Age 0 to 47.7%  Unlock5.9%
 Age 5 to 9  Unlock8.2%6.1%
 Age 10 to 1410.0%  Unlock6.6%
 Age 15 to 17  Unlock6.8%3.9%
 Age 18 to 201.3%  Unlock4.0%
 Age 21 to 24  Unlock3.0%5.2%
 Age 25 to 341.8%  Unlock13.8%
 Age 35 to 44  Unlock12.8%12.9%
 Age 45 to 5415.6%  Unlock12.6%
 Age 55 to 59  Unlock8.5%6.7%
 Age 60 to 644.5%  Unlock6.3%
 Age 65 to 74  Unlock8.6%9.6%
 Age 75 to 843.6%  Unlock4.5%
 Age 85 and over  Unlock2.9%1.9%
 space1
 Race
 Old Greenwich, CTCos Cob, CTUnited States
 White79.7%  Unlock59.4%
 Black  Unlock0.3%12.2%
 Asian6.8%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.8%0.4%
 Two or More Races3.9%  Unlock3.2%
 Hispanic  Unlock11.2%18.4%
 space2
 Marriage & Family
 Old Greenwich, CTCos Cob, CTUnited States
 Married Population70.5%  Unlock49.8%
     Currently Married  Unlock57.9%48.0%
 Married but Separated0.6%  Unlock1.8%
 Single Population  Unlock41.5%50.2%
 Never Married20.1%  Unlock33.8%
 Divorced  Unlock9.4%10.8%
 Widowed3.5%  Unlock5.6%
 space5
 Household Size  Unlock2.742.60
 Households2,297  Unlock124,010,992
 Family Households  Unlock1,90280,755,759
     Married couple, w/children58.2%  Unlock30.5%
     Married couple, no children  Unlock38.9%42.9%
 Non Family Households532  Unlock43,255,233
     Single householder, w/children  Unlock13.2%15.8%
     Single householder, no children4.5%  Unlock10.8%
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Learn More About Old Greenwich, Connecticut
Overview
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Learn More About Cos Cob, Connecticut
Overview
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