Town Hall Address 111 Maryland Ave Rockville, MD 28850 United States- Montgomery County Website https://www.rockvillemd.gov/ Zoning 240-314-8200 PO Box 1547 Rockville, MD 20849 United States Fire District 301-424-0310 PO Box 1547 Rockville, MD 20849 United States Town Clerk 240-314-8280 111 Maryland Ave Rockville, MD 20850 United States Water 240-314-8420 111 Maryland Ave Rockville, MD 20850 United States Sewer 240-314-8420 111 Maryland Ave Rockville, MD 20850 United States Tax Collector 240-314-5000 111 Maryland Ave Rockville, MD 28850 United States Code Enforcement 240-314-8200 PO Box 1547 Rockville, MD 20849 United States County Montgomery