A mill is equal to $1.00 of tax for each $1,000 of assessment. To calculate the property tax, multiply the assessment of the property by the mill rate and divide by 1,000. For example, a property with an assessed value of $50,000 located in a municipality with a mill rate of 20 mills would have a property tax bill of $1,000 per year.

The rates for each year are based on the grand list from two years prior. For example, the mill rates for the 2021 fiscal year are based off the 2019 grand list.

Starting in FY 2017, legislation allows municipalities and special taxing districts to tax motor vehicles at a different rate than other taxable property, but it imposes a cap on the mill rate for motor vehicles. No district or borough may set a motor vehicle mill rate that if combined with the motor vehicle mill rate of the town, city, consolidated town and city or consolidated town and borough in which such district or borough is located would result in a combined motor vehicle mill rate above the cap.

The Office of Policy and Management maintains a listing of all real estate sales with a sales price of $2,000 or greater that occur between October 1 and September 30 of each year. For each sale record, the file includes: town, property address, date of sale, property type (residential, apartment, commercial, industrial or vacant land), sales price, and property assessment.

Data are collected in accordance with Connecticut General Statutes, section 10-261a and 10-261b: https://www.cga.ct.gov/current/pub/chap_172.htm#sec_10-261a and https://www.cga.ct.gov/current/pub/chap_172.htm#sec_10-261b.
Annual real estate sales are reported by grand list year (October 1 through September 30 each year). For instance, sales from 2018 GL are from 10/01/2018 through 9/30/2019.

Some municipalities may not report data for certain years because when a municipality implements a revaluation, they are not required to submit sales data for the twelve months following implementation.

This page provides some instructions, tips, and videos to help you perform common tasks on data.ct.gov. It also contains links to more in-depth help content.

The Grand List is the aggregate valuation of taxable property within a given town. This dataset includes a breakdown for taxable categories and exemptions from 2011-2023 Grand List years. The following categories and exemptions are included:

Town Name, Residential, Commercial, Industrial, Public Utility, Vacant, Land Use, 10 Mill Forest, Apartments, Total Real, Real Exemptions, Total Net Real, Motor Vehicles, MV Exemptions, Total Net MV, Personal Property, Personal Property Exemptions, Total Net Personal Property, Total Net Grand List.

Municipal grant/reimbursement amounts for programs administered by the Office of Policy and Management from State General Fund for Fiscal Years 2010 through 2024.

This registry provides a list of licensed nursing facilities in Connecticut as of September 30th each year, beginning with data from 2013. For each facility, this dataset includes aggregate resident demographic information, private pay rates for private and semi-private rooms, payment sources and occupancy levels for each year.

The CT Open Data Portal makes data from state agencies publicly available in machine-readable format to increase government transparency, drive efficiencies, and spark innovation. This page highlights information about assets published on the Open Data Portal, including the types of assets and the number of views and downloads of data on the Portal.

The Small Town Economic Assistance Program (CGS Section 4-66g) funds economic development, community conservation and quality-of-life capital projects for localities that are ineligible to receive Urban Action (CGS Section 4-66c) bonds. This program is managed by the Office of Policy and Management, and the grants are administered by various state agencies.

This dataset lists STEAP awards from 2005-2023.

A list of Connecticut municipalities with the 3-digit tax code and the 2010 10-digit FIPS code for county subdivisions, assigned by the U.S. Census Bureau

A page displaying data on the economic impact of COVID-19 in Connecticut