Profile Picture Gary Archambault

created Apr 23 2021

updated Nov 24 2021


This table shows the number and percent of residents of each CT town that have initiated COVID-19 vaccination and are fully vaccinated by age group.
All data in this report are preliminary; data for previous dates will be updated as new reports are received and data errors are corrected.
A person who has received one dose of any vaccine is considered to have initiated vaccination. A person is considered fully vaccinated if they have completed a primary series by receiving 2 doses of the Pfizer or Moderna vaccines or 1 dose of the Johnson & Johnson vaccine. The fully vaccinated are a subset of the number who have received at least one dose.
The population denominators for these town- and age-specific coverage estimates are based on 2014 census estimates. This is the most recent year for which reliable town- and age-specific estimates are available. ( This census data is grouped in 5-year age bands. For vaccine coverage age groupings not consistent with a standard 5-year age band, each age was assumed to be 20% of the total within a 5-year age band. However, given the large deviation from this assumption for Mansfield because of the presence of the University of Connecticut, the age distribution observed in the 2010 census for the age bands 15 to 19 and 20 to 24 was used to estimate the population denominators.
This table does not included doses administered to CT residents by out-of-state providers or by some Federal entities (including DoD, DoC, VHA, HIS) because they are not yet reported to CT WiZ (the CT immunization Information System). It is expected that these data will be added in the future. Out-of-state residents vaccinated by CT providers are shown in this table as “Resident out of state”. People for whom an address is not currently available are shown in this table as “Address pending validation”. Town of residence is established by geocoding the reported address. If an address could not be geocoded the post-office designated town is used, if available.
Caution should be used when interpreting coverage estimates for towns with large college/university populations since coverage may be underestimated. In the census, college/university students who live on or just off campus would be counted in the college/university town. However, if a student was vaccinated while studying remotely in his/her hometown, the student may be counted as a vaccine recipient in that town.
SVI refers to the CDC's Social Vulnerability Index - a measure that combines 15 demographic variables to identify communities most vulnerable to negative health impacts from disasters and public health crises. Measures of social vulnerability include socioeconomic status, household composition, disability, race, ethnicity, language, and transportation limitations - among others. Towns with a "yes" in the "Has SVI tract >0.75" field are those that have at least one census tract that is in the top quartile of vulnerability (e.g., a high-need area). 34 towns in Connecticut have at least one census tract in the top quartile for vulnerability.
Note: This dataset takes the place of the original "COVID-19 Vaccinations by Town" dataset ( , which will not be updated after 4/15/2021. A dataset of vaccinations by town for all age groups is available here:
As part of continuous data quality improvement efforts, duplicate records were removed from the COVID-19 vaccination data during the weeks of 4/19/2021 and 4/26/2021.

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Health and Human Services
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Department of Public Health
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Department of Public Health
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