Town Hall Address 31 S Summit Ave. Gaithersburg, MD 20877 United States- Montgomery County Website https://www.gaithersburgmd.gov/ Zoning 301-258-6300 31 S Summit Ave. Gaithersburg, MD 20877 United States Town Clerk 301-258-6300 31 S Summit Ave. Gaithersburg, MD 20877 United States Water 301-258-6370 800 Rabbitt Rd. Gaithersburg, MD 20877 United States Sewer 301-258-6370 800 Rabbitt Rd. Gaithersburg, MD 20877 United States Tax Collector 301-258-6320 31 S Summit Ave. Gaithersburg, MD 20877 United States Code Enforcement 301-258-6300 31 S Summit Ave. Gaithersburg, MD 20877 United States County Montgomery