Town Hall Address 323 Route 81 Killingworth, CT 06419 United States- Middlesex County Website http://www.townofkillingworth.com Town Clerk 860-663-1765 Ext. 502 https://connecticut-townclerks-records.com/User/Login.aspx?ReturnURL=/index.aspx United States Assessor Ext. 506 http://www.propertyrecordcards.com/searchmaster.aspx?towncode=070 United States Building Ext. 504 M&W- 1-3pm, TuThu-10-12 United States Zoning Ext. 505 Tu, Thu, Fri 9-12 United States Probate Court Saybrook (PD-33) Tax Adjustment Uniform Fiscal Year- July, January Indices General Index > real property > town taxes Town Hall Hours Monday to Friday – 8:00 to 12:00 and 1:00 to 4:00 Water Source Well and Septic Sewer Source Well and Septic County Middlesex