In the 1900 US Census for District 101, Campbell, Jennings County, Indiana the family of Guy C. Barnum was enumerated as follows:
Dwelling #108; Family #115
Barnum, Guy C.; Head; W; M; b. July 1871; 28; Married 6 years; b. Indiana; Both parents b. Indiana; Railroad laborer; Unemployed 3 months during the census year; Can read, write and speak English
Barnum, Carrie; Wife; W; F; b. Jan. 1873; 27; Married 6 years; Mother of 2 children; 2 children living; b. Indiana; Both parents b. Indiana; Can read, write and speak English
Barnum, Vivian; Son; W; M; b. Mar 1895; 5; Single; b. Indiana; Both parents b. Indiana
Barnum, Blanch; Daughter; W; F; b. July 1898; 1; Single; b. Indiana; Both parents b. Indiana The Barnum Family gives his birth year as 1870.