Cos Cob, CT Demographics

A map of Cos Cob's Population by Race

Cos Cob, Connecticut has an estimated population of 7,546, an increase from the 6,873 recorded in the 2020 Census. The population is 64.4% White, 15.0% Hispanic, 10.4% Multiracial, 6.5% Asian, 3.1% Black, and 0.5% Native American/Other. This demographic dot map shows the population of Cos Cob, with one dot drawn for each person counted by the Census, color-coded by race.

Cos Cob has become considerably more racially diverse since the 2020 Census. It is less diverse than Connecticut overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Cos Cob, that probability was 41.9% in 2020 and 54.6% in the most recent ACS estimates.

Cos Cob is ranked the 46th most populous place in Connecticut, out of 215 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Cos Cob was ranked the 53rd most populous place in the 2020 Census.

Cos Cob's White Population

4,863 residents of Cos Cob, or 64.4% of the population, identify as White. The share of White residents in Cos Cob is slightly higher than in Connecticut overall, where 61.9% of the population is White. Cos Cob ranks 162nd statewide in terms of White residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's White population has declined by an estimated 5.6%. White residents' share of Cos Cob's population has decreased from 74.9% to 64.4%.

Cos Cob is more White than neighboring Riverside (61.9% White), Greenwich (63.4% White), and Stamford (43.2% White). Cos Cob is less White than neighboring Indian Field (91.5% White), and Old Greenwich (76.5% White).

Cos Cob's Black Population

237 residents of Cos Cob, or 3.1% of the population, identify as Black. The share of Black residents in Cos Cob is lower than in Connecticut overall, where 9.8% of the population is Black. Cos Cob ranks 152nd statewide in terms of Black residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's Black population has grown by an estimated 253.7%. Black residents' share of Cos Cob's population has increased from 1.0% to 3.1%.

Cos Cob is more Black than neighboring Riverside (3% Black), Indian Field (0% Black), and Old Greenwich (0.5% Black). Cos Cob is less Black than neighboring Greenwich (4.4% Black), and Stamford (17.7% Black).

Cos Cob's Asian Population

494 residents of Cos Cob, or 6.5% of the population, identify as Asian. The share of Asian residents in Cos Cob is comparable to the share in Connecticut overall, where 4.7% of the population is Asian. Cos Cob ranks 16th statewide in terms of Asian residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's Asian population has declined by an estimated 6.6%. Asian residents' share of Cos Cob's population has decreased from 7.7% to 6.5%.

Cos Cob is more Asian than neighboring Indian Field (3.1% Asian), and Greenwich (6.1% Asian). Cos Cob is less Asian than neighboring Riverside (13% Asian), Old Greenwich (9.2% Asian), and Stamford (7.3% Asian).

Cos Cob's Hispanic Population

1,131 residents of Cos Cob, or 15.0% of the population, identify as Hispanic. The share of Hispanic residents in Cos Cob is slightly lower than in Connecticut overall, where 18.3% of the population is Hispanic. Cos Cob ranks 53rd statewide in terms of Hispanic residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's Hispanic population has grown by an estimated 56.4%. Hispanic residents' share of Cos Cob's population has increased from 10.5% to 15.0%.

Cos Cob is more Hispanic than neighboring Indian Field (1.8% Hispanic), and Old Greenwich (7.2% Hispanic). Cos Cob is less Hispanic than neighboring Greenwich (16.1% Hispanic), and Stamford (28.3% Hispanic).

Cos Cob's Native American/Other Population

38 residents of Cos Cob, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Cos Cob is comparable to the share in Connecticut overall, where 1% of the population is Native American/Other. Cos Cob ranks 53rd statewide in terms of Native American/Other residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's Native American/Other population has declined by an estimated 36.7%. Native American/Other residents' share of Cos Cob's population has remained roughly unchanged at 0.5%.

Cos Cob is more Native American/Other than neighboring Indian Field (0% Native American/Other), and Old Greenwich (0.2% Native American/Other). Cos Cob is less Native American/Other than neighboring Riverside (0.6% Native American/Other), Greenwich (6.3% Native American/Other), and Stamford (0.7% Native American/Other).

Cos Cob's Multiracial Population

783 residents of Cos Cob, or 10.4% of the population, identify as Multiracial. The share of Multiracial residents in Cos Cob is higher than in Connecticut overall, where 4.3% of the population is Multiracial. Cos Cob ranks 47th statewide in terms of Multiracial residents as a share of the population, out of 215 places.

Since the 2020 Census, Cos Cob's Multiracial population has grown by an estimated 127.0%. Multiracial residents' share of Cos Cob's population has increased from 5.0% to 10.4%.

Cos Cob is more Multiracial than neighboring Riverside (6.5% Multiracial), Indian Field (3.6% Multiracial), Old Greenwich (6.4% Multiracial), Greenwich (3.7% Multiracial), and Stamford (2.8% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.