In the 1920 US Census for District 76, Thetford, Genesee County, Michigan, the family of George W. Barnum was enumerated as follows:
Dwelling #106; Family #111
Barnum, George; Head; Owns a farm home with mortgage; Male; White; 63; Married; Year of immigration to the US unknown; US citizen; Can read and write; b. Canada - mother tongue English; Father b. Pennsylvania; Mother b. England - mother tongue English; Able to speak English; Farmer; General farm; Employer; Farm schedule 98
Barnum, Jennie; Wife; Female; White; 62; Married; Year of immigration to the US unknown; US citizen; Can read and write; b. Canada - mother tongue English; Both parents b. Canada - mother tongue English; Able to speak English; No occupation
Barnum, Harry J. [sic]; Son; Male; White; 31; Single; Can to read and write; b. Michigan; Both parents b. Canada - mother tongue English; Able to speak English; Laborer; Home farm