TNR (Trap-Neuter-Return) 

National

Alley Cat Allies
http://www.alleycat.org

Dane County 

Dane County Friends of Ferals
http://www.daneferals.org/

Northeast Wisconsin
Cats Anonymous
http://www.catsanonymous.org/

Washington County


The Washington County Humane Society
TNR Program
http://www.washingtoncountyhumane.org/services/tnr.html