The Ohio History Connection provides a great tool to the public for researching historical areas in every county.
- https://gis.oshpo.org/Html5Viewer/Index.html?configBase=https://gis.oshpo.org/Geocortex/Essentials/OMS/REST/sites/OMS/viewers/OHS_hv/virtualdirectory/Resources/Config/Default#
Username: public
Password: password