This is a list of municipalities in Connecticut in order of population from greatest to least. Connecticut's fundamental form of local government is the New England town. The state is composed of 169 towns. Nineteen of these towns are chartered as cities, in addition to one borough. These nineteen cities and one borough all share the same border with their namesake towns and have a merged city–town government. In addition, there are two cities and eight boroughs which constitute only a section of the towns in which they are situated.   Since their populations are already included in the census figures of their parent towns, the non-coterminous cities and boroughs, while listed for comparison purposes, are not given a ranking in the population roll. The list includes all current municipalities that are chartered by the Connecticut General Assembly and does not include former cities such as Willimantic. Figures are based on the 2008 U.S. Census Bureau estimates  except where otherwise noted. The top seven cities are listed according to 2010 census data.
|2015 rank||City||2015 estimate ||2010 Census ||Change||County||Notes|
|2||New Haven||130,322||129,779||+0.42%||New Haven|
|16||West Haven||54,927||55,564||−1.15%||New Haven||coterminous city/town|
|18||Milford||52,087||52,759||−1.27%||New Haven||coterminous city/town|
3 smallest municipalities
|186||Bantam||735||759||−3.16%||Litchfield||borough within the town of Litchfield|
|188||Fenwick||43||43||0.00%||Middlesex||borough within the town of Old Saybrook|
- Administrative divisions of Connecticut
- List of cities in Connecticut
- List of counties in Connecticut
- List of towns in Connecticut
- "CT.gov: About Connecticut". Retrieved 2005-12-18.
- Connecticut's Boroughs and Cities Archived 2007-02-03 at the Wayback Machine.. Connecticut State Library. Accessed 20 January 2007.
- U.S. Census Bureau - Subcounty population estimates for Connecticut (2008)
- "Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2015". United States Census Bureau. Retrieved 20 May 2016.
- "2010 Census Redistricting Data (Public Law 94-171) Summary File". American FactFinder2. U.S. Census Bureau, 2010 Census. Retrieved 29 October 2012.