1930 Waterloo, Black Hawk, Iowa Clarence Moore 41 b abt 1889 in Mississippi (everyone b MS until Hardy) Mary Moore 35 Sarina Moore 20 Adaline Moore 19 Maderine Moore 16 Clarence Moore 12 Bessie Moore 8 Anna Lou Moore 7 Mary Bee Moore 6 b Mississippi Hardy Freeman Moore 4 b Iowa Elliot Moore 2 Dora Gladies Moore 1 Eugene Russell Moore 1 month
Clarence occupation in 1930 is given as Labor, John Deer Company [sic], with the John Deer crossed out.
1940 Waterloo, Black Hawk, Iowa 241 Jackson Street Clarence Moore 53 b abt 1887 in Mississippi Mary Moore 47 b abt 1893 Mississippi Surmac Davis 30, daughter, b abt 1910 Mississippi Robert Davis 49 Residence in 1935: Same Place
FYI the 1940 census is currently available free and searchable online at Ancestry.com. Lets you see the original census document, which is always more satisfying than reading the sometimes mangled transcriptions. Family Search is a free online database that also might have more info.