Town Hall Address 405 Jefferson St. Washington, MO 63090 United States- Franklin County Website https://washmo.gov Zoning 636-390-1004 405 Jefferson St. Washington, MO 63090 United States Town Clerk 636-390-1004 405 Jefferson St. Washington, MO 63090 United States Tax Collector 636-390-1090 405 Jefferson St. Washington, MO 63090 United States County Franklin