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ZIP Code Database - Facts & Stats

Data Last Updated: March 1, 2023

ZIP Codes for City of Cos Cob, CT

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Area Code(s):203, 475
Timezone(s):Eastern (GMT -05:00)
City Population:6,770 (More Details)
CBSA:Bridgeport-Stamford-Norwalk, CT
Congressional District(s):04
Land Area:625 square miles (county)
Water Area:212 square miles (county)

1 ZIP Code

Cos Cob, CT ZIP Code Boundaries

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Cos Cob, CT Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Cos Cob, CT Demographic Information *

Total population**6,770
Male population3,233
Female population3,537
Median age (years)40.8
White Population5,821
Black Population76
Indian Population4
Asian Population613
Hawaiian Population3
Hispanic Population507
Median age (Male)40
Median age (Female)41.4
Total households2,542
Family households (families)1,842
Average household size2.65
Average family size3.17
Total housing units2,698
* Demographic data is based on 2010 Census for the City of COS COB.
** City and ZIP Code Population will not be equal due to differences in their geographies.


  1. U.S. Postal Service [Last Updated: 2/1/2023],
  2. Internal Data Creation [Last Updated: 2/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],