Recent distribution maps show raccoon as occupying only the extreme eastern-northeastern portion of Wyoming. However, there is substantial evidence that raccoon are common throughout Wyoming and currently inhabit all the major and many of the minor drainages throughout Wyoming.
Hart, E. Blake
"The raccoon, Procyon Iotor, in Wyoming,"
Great Basin Naturalist: Vol. 42
, Article 15.
Available at: http://scholarsarchive.byu.edu/gbn/vol42/iss4/15