I think I sent this a few days ago to the list, but in case I didn't here it is again.
I found the Cooley family in Montana on three city directories.
1903 Billings MT
Cooley, Perrin C, tmstr, h 303 N23d
Cooley, Prince A, lab B& M R R co., r 303 N 23d
1910 Livingson MT
Cooley, Albert P, farmer
Cooley, Perrin E
1911 Helena MT
Coole, C.W., inmate County Hospital
Cooley, Charles, inmate County Hospital
Cooley, Perrin C, rancher, r 1433 Walnut
Cooley, Princess A, lab, h 1433 Walnut