In the 1910 US Census for Mesquite Precinct, Clark, Nevada, the Calvin BARNUM family is enumerated as follows:
Dwelling #75; Family #75
BARNUM, Calvin D.; Head; M; W; 22; M1; years M 0; b. Utah; father b. Utah; mother b. Utah; speaks English; Farmer; Own Farm; Employed; can read and write; Owns farm home free of mortgage; Farm Schedule 48
BARNUM, Lucy J.; Wife; F; W; 24; M1; years M 0; mother of 0 children; 0 living; b. Utah, father b. Utah; mother b. Utah; speaks English; No occupation; can read and write, attended school during previous year