1900 Jefferson County Colorado Federal Census (Ancestry, Image 4) William age 25 was living with his mother and step father Charles Calkins.

1920 Los Angeles California Federal Census (Ancestry, Image 7),Los Angeles Assembly Dist. 71, Dist. 296, SD 8, ED 296, Sht 4A, pg.177A, 6 & 7 January, Dwelling 83, Family 86, William L. Leonard, 46, Contractor, own shop, (IA,MO,IA), Lottie, 39 (CA,CA,CA), Osborn W. Leonard, 11, (CA,IA,CA)

1930 Los Angeles California Federal Census (Ancestry, Image 8), Hawthorne, Dist. 999, Inglewood Twp, Ed 19-999, SD 19, Sht. 4B, 5 April, Dwelling 105, Family 111, William L. Leonard, 56, married 1st at 33, occupation none b. IA,MO,IA), Lottie, 49, married 1st at 26, (CA,CA,CA), Osborn W., son, 21, single Driver, Ice Wagon, (CA,IA,CA),M. Ellen Calkins, mother, 81, widow, (IA,NY,ME), Evelyn Leonard, niece, 15, (CO,IA,CO), Inez Levene, Roomer, 20 single Waitress Restaurant (NE,NE,NE)

Ancestry, California Death Index 1940-1997 Record
William Lewis Leonard
Birth Date: 2 Nov 1873 - Iowa
Death Date: 3 Nov 1954 - Los Angeles
Mother's maiden Name: Sloper(sic) - should be Osborn
Father's Surname: Leonard