Town Hall Address 610 Main Street Waltham, MA 02452 United States- Middlesex County Website http://www.city.waltham.ma.us/ Town Clerk 781-314-3120 https://www.city.waltham.ma.us/city-clerk United States Assessor 781-314-3200 https://www.city.waltham.ma.us/assessors-department 8:30 - 4:30, Monday through Friday 610 Main Street Waltham, United States Tax Collector 781-314-3250 Hours: 8:30 - 4:30, Monday through Friday United States Fire District 781-314-3710 United States Water 781-314-3810 United States Town Hall Hours 8:30 - 4:30, Monday through Friday County Middlesex