In the 1920 US Census for District 10, Westville, Adair County, Oklahoma the family of Earl Barnum was enumerated as follows:
Dwelling #271; Family #279
Barnum, Earl C.; Head; Rents farm home; Male; White; 21; Married; Able to read and write; b. Arkansas; Both parents b. Arkansas; Able to speak English; Farmer; Farm; Works for own account; Farm schedule 61
Barnum, Eva C.; Wife; Female; White; 18; Married; Able to read and write; b. Missouri; Father b. Indiana; Mother b. Missouri; Able to speak English; No Trade or profession
[Note: His father and family were living four houses away].