Town Hall Address 200 South Greeley Avenue Chappaqua, NY 10514 United States- Westchester County Website http://mynewcastle.org/ County Clerk Timothy C. Idoni 914-995-3081 Mon - Fri, 8am - 5pm 110 Dr. Martin Luther King Jr. Blvd White Plains, NY 10601 United States Town Clerk 914-238-7271 Monday-Friday 8:45 a.m. – 4:30 p.m. 200 South Greeley Avenue Chappaqua, NY 10514 United States Tax Collector 914-238-7271 Monday-Friday 8:45 a.m. – 4:30 p.m. 200 South Greeley Avenue Chappaqua, NY 10514 United States Assessor 914-238-4722 assessor@mynewcastle.org Monday-Friday, 8:45a.m. – 4:30p.m. 200 South Greeley Avenue Chappaqua, NY 10514 United States County Westchester