Madison Soil and Water Conservation District
- Agency responsible for the protection of natural resources within the county that assists landowners in planning and applying conservation practices on their land.
- http://www.co.madison.oh.us/15085/

Butterflies of Madison County
- Presents photos and species accounts of butterflies found within the county.
- http://www.butterfliesandmoths.org/map?dc=289&_dcc=1&si=36

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