David Dietsch, CMMA II

Catherine Norton, Assessor Clerk

Hours: Tuesday and Thursday from 12:00 to 1:00, Wednesdays, and by appointment

Address:  562 Colebrook Road, Colebrook, CT 06021

Mailing Address:  P.O. Box 5, Colebrook, CT 06021

Phone: (860) 379-3359  ext. 206         


The Assessor’s Office is responsible for discovering, valuing, and updating all taxable property including real estate, motor vehicles and personal property in the Town of Colebrook. After the Grand List of taxable property is finalized in January, the budget process begins, finishing with the establishing of a mill rate. The mill rate for the 2021 Grand List is 32.25.

No longer own your motor vehicle?  Please click here to find out what is required to obtain a tax credit (if applicable).

The Assessor’s Office also administers many tax relief and exemption programs.  Please click here for 2022 Tax Relief Programs offered by the Town of Colebrook and the State of Connecticut.  If you would like more information on these programs, please feel free to call 860-379-3359 x206 or email

Tax Relief Applications




Must be filed by any Colebrook business or for any unregistered motor vehicle(s) with the Assessor between October 1 and November 1, 2022. If you do not file by November 1st, Connecticut State Statute dictates that the Assessor must file for you, and apply a 25% penalty. Any filing received after November 1st is subject to a 25% penalty according to State Statute Section 12-42. All declarations must be completed, signed and returned or postmarked by that date. Forms will be mailed to existing businesses and are also available on-line at

Personal Property Declaration Long Form

Personal Property Declaration Short Form

Manufacturing Exemption Form

Exemption for Farm Machinery, Horses or Ponies Form