Building Codes: National Zoning Atlas

These people National Zoning Atlas got an award for what they doing. They are making a atlas to help you figure out what building codes cover what areas.
Currently they have things going in several states, mostly around the cities,  https://www.zoningatlas.org/projects
but they are trying to expand.
Might be worth watching them if you are dealing with codes or buying someplace where you want to know what you'd run into.

Obviously, this is a work in progress, but it will be incredible when it is completed.