Butterflies of Hancock County
- Presents photos and species accounts of butterflies found within the county.
- http://www.butterfliesandmoths.org/map?dc=42&_dcc=1&si=36

Water Resources of Hancock County
- Factsheet providing information on water resources and drinking-water quality in the county.
- http://ohioline.osu.edu/aex-fact/0480_32.html

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