Butterflies of Holmes County
- Presents photos and species accounts of butterflies found within the county.
- http://www.butterfliesandmoths.org/map?dc=174&_dcc=1&si=36

Holmes County Environmental Data
- Index to program areas, educational information, newsletters and events available through Ohio State University Extension.
- http://holmes.osu.edu/

Holmes Soil and Water Conservation District
- Agency responsible for protecting the natural resources within the county that assists landowners in planning and applying conservation practices on their land.
- http://holmes.oh.nacdnet.org/