Town Hall Address 210 N Hamilton Monticello, IL 61856 United States- Piatt County Website https://www.cityofmonticello.net/ Zoning 217-762-2583 210 N Hamilton Monticello, IL 61856 United States Town Clerk 217-762-2583 210 N Hamilton Monticello, IL 61856 United States Tax Collector (217) 762-4266 101 W Washington St Monticello, IL 61856 United States County Piatt