If you could find the marriage or record of Molly/Mary coming to U.S. there might be a bit of a clue as to location in Ireland.
1920 census- Mendham, Morris, N.J.- Joseph Turley to U.S. 1907 and wife Mary to U.S. 1900 so looks like marriage might have taken place in N.J. (eldest son Joseph James Turley born 6 Aug.1914 Morristown, N.J.).
1930 census- Bernardsville, Somerset, N.J.- Joseph to U.S. 1921 (born Northern Ireland) and Mary to U.S. 1919 (unlikely to be correct in view of children born 1914 onwards in U.S.)