Town of Thompson Share: Town Government Town of Thompson Visit Website Request Info 4052 State Route 42 Monticello, NY 12701 845-794-2500 x306 (845) 794-8600 (fax) Facebook Hours: Town Hall Hours:8:30 AM to 4:30 PM About Rep Info Map About The Town contains many residential neighborhoods, including a variety of lake communities, within the hamlets of Rock Hill, Harris, Kiamesha Lake, Thompsonville, Glen Wild, and Sackett Lake in additio Whom to Contact William Rieber Supervisor Phone: (845) 794-2500 What's Nearby? Distance: 5 10 15 20 25 50 mi.