Town Hall Address 30 Field Park Drive Haddam, CT 06438 United States- Middlesex County Website http://www.haddam.org Town Clerk 860-345-8531 Ext. 212 & 211 United States Assessor Ext. 226 http://gis.vgsi.com/haddamct/ United States Probate Court Saybrook (PD-33) Tax Adjustment Uniform Fiscal Year- July, January Tax District Hidden Lake Indices General Index > real property > town taxes > tax district taxes Town Hall Hours Monday to Wednesday – 8:30 to 4:00, Thursday – 8:30 to 6:00, Friday – 8:30 to 12:00 County Middlesex