Hi, I've done an "Oklahoma" search in Ancestry.com for Jack Milligan & Margaret Milligan. It listed two entries for Jack Milligan but not any in Pittsburg County. 1). Comanche County, Ok. - Lawton - Jack Milligan, age 34, born in Arkansas; wife Birdie, age 34(?), born in Texas, a daughter, Lola age 11 months, born in Oklahoma - his occupation was at a sawmill. AND # 2). At Enid, Oklahoma - Jack Milligan, age 57, born in Iowa and Katie, wife, age 56, born in Pa., - no others listed in the household. His occupation was fireman.
Hope there's something here that might help.