COVID-19 Community Levels Map Update, Nov. 18, 2022: The Centers for Disease Control and Prevention has listed Fairfield, Hartford, Litchfield, Middlesex, New Haven, Tolland, and Windham Counties in the Medium/Yellow category as part of its COVID-19 Community Levels Map. New London County is currently listed in the Low/Green category. Visit the CDC COVID-19 Community Levels Map for updates.

Annual Town and County Population for Connecticut

Annual Town and County Population for Connecticut

Annual DPH population estimates for Connecticut's counties and towns are calculated for July 1st of each year and are released by October of the following year.  These estimates typically constitute the basis for determining birth, death, and other population based rates.  In addition to the annual estimates, a discussion of the methodology used to calculate the estimates is included with each release.  Data tables containing the population estimates are also available in separate Excel files for each year.

For additional information, please read our Population Statistics Overview.

 Annual Population Estimates Reports (PDF)
  1996 1997 1998 1999
2000 2001 2002 2003 2004
2005 2006 2007 2008 2009
2010 2011 2012 2013 2014
2015  2016 2017 2018  2019
2020 2021      


Annual Population Estimates Data (Excel)
   1996  1997  1998  1999
 2000  2001  2002  2003  2004
 2005  2006  2007 1  2008 1  2009
 2010  2011  2012  2013  2014
 2015  2016  2017  2018  2019
 2020  2021      



At this time, town-level population estimates by demographic variables such as age, sex, race and Hispanic ethnicity (ASRH) are available only for July 1, 2000 and July 1, 2010-2014.  For these or other population estimates, please visit our Population Statistics webpage.


Population estimates reported here are considered "post-censal" estimates as they are estimated using the most recent census counts. Estimates for 1996-1999 are post-1990 census, 2000-2009 are post-2000 census, and 2010-2019 are post-2010 census.  These estimates are not the same as "inter-censal" estimates.  For these or other population estimates, please visit our Population Statistics webpage.


1 Changes in Estimates Methodology: The Vintage 2008 postcensal population estimates reflect three major improvements in the estimates methodology. Improvements include changes in 1) the estimation of net international migration, 2) the incorporation of accepted challenges and special censuses into the national population estimates, and 3) the imputation of the race and Hispanic origin for births. These methodology changes go beyond the extensive methodology changes implemented for the Vintage 2007 estimates. The net impact of the various methodologic changes is a downward shift of the Vintage 2008 postcensal population estimates when compared to those from the Vintage 2007 series; the Vintage 2007 postcensal estimates also reflected a downward shift when compared to the 2006 estimates. 


See the Census' Documentation for Population Estimates for more information.