Town Hall Address 520 Main St Mount Vernon, IN 47620 United States- Posey County Website https://www.mountvernonin.gov/ Zoning 812-838-1323 123 E 3rd St Mount Vernon, IN 47620 United States Fire District 812-838-3447 311 College Ave Mount Vernon, IN 47620 United States Town Clerk 812-838-5576 520 Main St Mount Vernon, IN 47620 United States Water 812-838-2136 123 College St Mount Vernon, IN 47620 United States Sewer 812-838-2136 123 College St Mount Vernon, IN 47620 United States Tax Collector 812-838-1316 126 E 3rd St Mount Vernon, IN 47620 United States Code Enforcement 812-838-1300 126 E 3rd St Mount Vernon, IN 47620 United States Town Hall Hours M-F, 8-4 County Posey