http://en.wikipedia.org/wiki/John_L._LewisUnder "Early Life and Rise to Power" there is information on his parents and place of birth.
1880 Cleveland, Lucas, Iowa
Lewis, Thomas, 26, miner, b. Wales
Ann L, 20, keeping house, b. Wales
John L, 4/12, b. Feb, Iowa
1900 Whitebreast, Lucas, Iowa
Lewis, Thomas H, b. July 1854, married 22 yrs, b. Wales, immig
1870, Naturalized, farmer
Louisa, b. Oct 1858, mother of 8 children, 6 children
living, b. Wales
John, b. Feb 1880, b. Iowa, farm laborer
Thomas, b. July 1882
George, b. Sep 1885
Alma, b. Jan 1889
Howard, b. Jun 1891
Hattie, b. Jan 1894
1910 Grisham, Montgomery, Illinois
Lewis, John L, 30, married 2 years, b. Iowa, miner, coal mine
Myra, 29, mother of 1 child, 1 child living, b. Ohio
Martha, 1, b. Iowa
1920 Springfield, Sangamon, Illinois
Lewis, John L, 39, married, b. Iowa, parents b. Wales, Pres
United Mine Workers
Murta B, 38, married, b. Ohio
Catherine, 8 b. Illinois
John L, 1 2/12, b. Illinois (Nov 1919)
next household
Lewis, Louisa Mrs., 61
George W, 34, b. Iowa
Alma D, 30, b. Iowa
Hattie M, 25, b. Iowa
Raymond, 19, b. Iowa
Edith, 16, b. Iowa
Thomas A, son, 38, b. Iowa
Lenora E, dau-in-law, 32, b. Kansas
1930 Springfield, Sangamon, Illinois
Lewis, John L, 50 -----President Mine Workers
Myrta, 49
Kathryn, 18
John 11
next household
Lewis, Louisa, 71
Alma D, 41
Raymond O, 29
Sarah Edith, 26