The Ervin community was located southeast of Hugo on Fallon Road. There are 3 maps available on the county genweb site that are helpful in locating the community.
http://www.okgenweb.org/~okchocta/towns.htm will give you a general idea where Ervin was located.
The map at http://www.okgenweb.org/~okchocta/maps/ ... 3xCol6.gif shows the exact location as indicated on a 1930 county map.
On the modern day map at http://www.okgenweb.org/~okchocta/count ... _17-18.gif Ervin would be located at the intersection of section lines 2110 & 4290.