Town Hall Address 149 Main Street Watertown, MA 02472 United States- Middlesex County Website http://www.watertown-ma.gov/ Town Clerk 617-972-6486 http://www.ci.watertown.ma.us United States Assessor 617-972-6410 https://www.ci.watertown.ma.us/61/Assessor Monday, Wednesday - Friday 8:30 a.m. - 5:00 p.m. Tuesday 8:30 a.m. - 7:00 p.m. 149 Main Street Watertown, United States Tax Collector 617-972-6450 8:30AM to 5PM on Monday, Wednesday, Thursday; 8:30AM to 7PM on Tuesday; 8:30AM to 5PM on Friday. 149 Main Street Watertown, United States Fire District 617-972-6567 United States Water 617-972-6420 United States Town Hall Hours Monday, Wednesday - Friday 8:30 a.m. - 5:00 p.m. Tuesday 8:30 a.m. - 7:00 p.m. County Middlesex