McMahons of the Bronx, New York

I am interested in finding any descendants of Michael McMahon, my great grandfather, who died in New York in 1911 at the age of 34. He was married to Mary Ann McMahon, (nee Maloney) and had five surviving children, John Joseph, Albert, Helen, Mary and Catherine. He was born on February 2, 1877 in Ireland. His parents in Ireland were Michael McMahon and Margaret McMahon (nee O'Callaghan). I am also interested in finding out just where in Ireland he came from, although I am fairly certain it was Co. Clare. Any information is appreciated.