Town Hall Address 1625 Massachusetts Avenue Lexington, MA 02420 United States- Middlesex County Website http://www.lexingtonma.gov/ Town Clerk 781-698-4550 https://www.lexingtonma.gov/town-clerk United States Assessor 781-698-4578 https://www.lexingtonma.gov/assessor Mon-Fri: 8:30-4:30 1625 Massachusetts Avenue Lexington, United States Tax Collector 781-698-4600 Mon-Fri: 8:30-4:30 1625 Massachusetts Avenue, First floor Lexington, United States Fire District 781-862-0272 United States Water 781-274-8300 United States Town Hall Hours Mon-Fri 8:30-4:30 County Middlesex