COVID-19 Community Levels Map Update, Jan. 27, 2023: The CDC has listed three Connecticut Counties—Litchfield, Middlesex and New Haven Counties—in the High/Orange category as part of its weekly COVID-19 Community Levels update. Fairfield, Hartford, New London, Tolland and Windham Counties are listed in the Medium/Yellow category.  Because all eight Connecticut counties are either in the High or Medium categories, the Connecticut Department of Public Health recommends that all residents consider wearing a mask in public indoor spaces. People who are at high risk for severe illness should consider additional measures to minimize their exposure to COVID-19 and other respiratory illnesses. Visit the CDC COVID-19 Community Levels Map for updates.

Please visit to request four free COVID-19 self-test kits from the Federal Government. Find a location that has a supply of COVID-19 therapeutics as part of the Test to Treat initiative here. The complete DPH COVID-19 toolbox is located at



Our Population Statistics Overview provides detailed information about each of the population data sources available for Connecticut, limitations of and differences between the datasets, and Q & A examples which may help when choosing a data source.  The US Census Bureau's population estimates terms and definitions may also be helpful.


Annual July 1 Estimates

The Connecticut state, county and town level populations are estimated at the calendar year midpoint (July 1) each year.  These July 1 estimates typically constitute the basis for determining birth, death, and other population based rates. The annual estimate represents the official Connecticut population estimate for the year.


Decennial Census Population Counts

The US Census Bureau takes a census of the population of the United States every 10 years which is known as the decennial census.  A major source of population data for CT, the decennial census attempts to provide a true count of the population rather than an estimate.  The decennial census serves as the population base for the next 9 years of annual estimates.  (To access Census data for other geographies of the United States, please visit American FactFinder.)


The Census 2010 collected population counts and demographic characteristics of the Nation and its component geographies as of April 1, 2010.  Census 2010 marks the first decennial census that does not use a long form to collect social and economic data.  Source: Census 2010 Summary File 1.


The Census 2000 collected a variety of demographic, social, economic, and housing information as of April 1, 2000.  Basic counts and cross-tabulations for Connecticut residents are provided below.  Source: Census 2000 Summary File 1.


Other US Census Products

In addition to the decennial census, the U.S. Census Bureau also releases several other data products that provide detailed social, demographic, and economic data. 

  • American Community Survey — annually: The American Community Survey (ACS) is an ongoing survey that provides data every year - giving communities the current information they need to plan investments and services. Information from the survey generates data that help determine how more than $400 billion in federal and state funds are distributed each year. 

  • Economic Census — every 5 years: The economic census provides a detailed portrait of the United States' economy once every five years, from the national to the local level. Government agencies, businesses, entrepreneurs, researchers and others use economic data to develop public policy, evaluate industry growth, plan disaster relief services, assist local businesses and much more.

  • Census of Governments — every 5 years:  The Census of Governments provides data about how governments are organized, how many people they employ and payroll amounts, and the finances of governments. Federal statistical agencies use the data to measure the nation's economic and financial performance. State and local governments use the data to develop programs and budgets, assess financial conditions, and perform comparative analyses. Analysts, economists, market specialists, and researchers use these data to measure the changing characteristics of the government sector of the economy and to conduct public policy research.

  • Demographic, Economic and Other Surveys: A survey is a method of collecting and analyzing social, economic, and geographic data. Throughout the decade between censuses we are continually conducting surveys to produce a general view and comprehensive study of the United States' social and economic conditions. Demographic surveys include the Current Population Survey and Women- and Minority-Owned Business Survey. Economic surveys include the Survey of Business Owners and County Business Patterns.

  • Economic Indicators: Economic indicators released by the Census Bureau include data on manufacturing, retail and food service sales, housing vacancies and ownership and international trade. View the economic indicator release schedule.