I believe, if you are a resident, you can do on line, if not go to the tax collector and complete a form; takes a few minutes. Last time I was there in Ellington without an appt, 1/2 hr wait.
Need mail with your name on it from new address. I just renewed mine I had to have SS card, and mail to change address.
I believe you need 2 pieces of mail with new address
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