The GIS Mapping Service allows users to research and view a wide variety of map-based data about St. Charles County. The site is managed by the GIS Services division of the Department of Information Systems. To find the zoning of a property search for the address, then select the Planning and Zoning from the Layers menu.
Additional features include estimating distances, checking utility & voting districts, viewing current and historical aerial photos of the property, and more.
The GIS Mapping Service and other GIS related data is also available on the County's Geo-Data and Mapping Hub.