Town Hall Address 685 Route 134 South Dennis, MA 02660 United States- Barnstable County Website http://www.town.dennis.ma.us/ Town Clerk 508-394-8300 http://www.town.dennis.ma.us/Pages/DennisMA_Clerk/index United States Assessor 508-760-6139 http://www.town.dennis.ma.us/Pages/DennisMA_Assessing/index Mon-Fri: 8:30 to 4:30 685 Route 134 Dennis, United States Tax Collector 508-760-6136 Mon-Fri: 8:30 to 4:30 685 Route 134 Dennis, United States Fire District 508-398-2242 United States Water 508-398-3351 United States Town Hall Hours Mon-Fri: 8:30 to 4:30 County Barnstable