Butterflies of Mahoning County
- Presents photos and species accounts of butterflies found within the county.
- http://www.butterfliesandmoths.org/map?dc=62&_dcc=1&si=36

Mahoning County Environmental Data
- Environmental information for developers.
- http://mahoning.osu.edu/

Mahoning 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://mahoningswcd.org/

Water Resources of Mahoning County
- Factsheet providing information on water resources and drinking water quality in the county.
- http://ohioline.osu.edu/aex-fact/0480_50.html