Town Hall Address 1 Main Street Ayer, MA 01432 United States- Middlesex County Website http://www.ayer.ma.us/ Town Clerk 978-772-8220 https://www.ayer.ma.us/town-clerk United States Assessor 978-772-8211 https://www.ayer.ma.us/assessor Mon, Wed, Thurs: 8:00 to 4:00 Tues: 8:00 to 7:00 Fri: 8:00 to 1:00 1 Main Street Ayer, United States Tax Collector 978-772-8209 Mon, Wed, Thurs: 8:00 to 4:00 Tues: 8:00 to 7:00 Fri: 8:00 to 1:00 1 Main Street Ayer, United States Fire District 978-772-8231 United States Water 978-772-8240 United States Town Hall Hours Mon, Wed, Thurs: 8:00 to 4:00 Tues: 8:00 to 7:00 Fri: 8:00 to 1:00 County Middlesex