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 1 | 2008 1 | 2009 |
| 2010 | 2011 | 2012 | 2013 | 2014 |
| 2015 | 2016 | 2017 | 2018 | 2019 |
| 2020 2 | 2021 2 | 2022 2,3 | ||
| 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 2 | 2021 2 | 2022 2,3 | ||
Notes:
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, 2010-2019 are post-2010 census, and 2020-present are post-2020 census. These estimates differ from the "intercensal" estimates which replace the post-censal estimates at the close of the decade and serve as the Census Bureau's final estimates for that decade. 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.
2 Blended Base Methodology: If developed during a typical year, the Vintage 2021+ estimates base for April 1, 2020, would have been drawn entirely from the 2020 Census. However, 2020 Census data were not available at the level of demographic detail necessary to develop the base for the Vintage 2021+ estimates. The “blended base” integrates data from three sources to create a high-quality estimate of the U.S. population on April 1, 2020, by leveraging advantages from each source. For more detail, see the Census Bureau’s discussion at https://www.census.gov/library/stories/2023/06/blended-base-methodology.html.
3 The Vintage 2022 population estimates released by the Census Bureau overestimate the population in Connecticut and select towns. For a detailed explanation of the known errors, see the CT Data Collaborative's blog post at https://www.ctdata.org/blog/known-errors-in-the-census-bureaus-vintage-2022-population-estimates.
See the Census' Documentation for Population Estimates for more information.