From History of Ontario County (New York) pub. 1893, p. 15-16: William M. Barnum has always been a resident of his father's farm. He was educated in Canandaigua Academy, and Rochester Business College, graduating in 1871. He taught school a short time, and then came back to assist his father on the farm. He is an active Republican. He married in 1872, Martha A., daughter James Hyde and they have three children: Fred C., Edith M. and Frank J. Mr. Barnum is a member of Academy Grange of which he was charter member, and is at present overseer.
In the 1880 US Census for District 119, Canandaigua, Ontario County, New York the family of William M. Barnum was enumerated as follows:
Dwelling #172; Family #185
Barnum, M. William; W; M; 28; Married; Farmer; b. New York; Both parents b. New York
Barnum, A. Matha; W; F; 28; Wife; Married; keeping house; b. New York; Both parents b. New York
Barnum, C. Frederic; W; M; 6; Son; Single; b. New York; Both parents b. New York
Barnum, M. Edith; W; F; 4; Daughter; Single; b. New York; Both parents b. New York
Barnum, J. Frank; W; M; 1/12; Son; Single; b. New York; Both parents b. New York
Bondy, George; W; M; 23; Servant; Single; Farm laborer; b. New York; Both parents b. New York
Ada E. Pearl; W; F; 19; Servant; Single; Domestic servant; b. New York; Both parents b. New York
In the 1900 US Census for District 51, Canandaigua, Ontario County, New York the family of William M. Barnum was enumerated as follows:
Dwelling #62; Family #64
Barnum, Wm. M.; Head; W; M; b. May 1852; 48; Married 1 year; b. New York; Both parents b. New York; Farmer; Employed full year; Can read, write and speak English; Owns farm home free of mortgage; Farm Schedule 43
Barnum, Bina B.; Wife; W; F; b. Mar 1847; 53; Married 1 year; Mother of 2 children; 2 children living; b. New York; Both parents b. New York; Can read, write and speak English
Barnum, Frank J.; Son; W; M; b. May 1880; 20; Single; b. New York; Both parents b. New York; Farm laborer; Employed full year; Can read, write and speak English
In the 1910 US Census for District 82, Canandaigua, Ontario County, New York the family of William M. Barnum was enumerated as follows:
Dwelling #139; Family #140
Barnum, William M.; Head; M; W; 59; 2nd marriage; Married 11 years; b. New York; Both parents b. New York; Speaks English; Farmer; General farm; Employer; Can read and write; Owns farm home free of mortgage; Farm Schedule 87
Barnum, Bina B.; Wife; F; W; 63; 3rd marriage; Married 11 years; Mother of 2 children; 2 children living; b. New York; Both parents b. New York; Speaks English; No occupation; Can read and write
Barnum, Fred C.; Son; M; W; 36; Widowed; b. New York; Both parents b. New York; Speaks English; Farm laborer; Home farm; Wage earner; Can read and write
Mapes, Caroline; Servant; F; W; 49; Married; Mother of 1 child; 1 child living; b. New York; Both parents b. New York; Speaks English; Servant; Private family; Wage earner; Employed full year; Can read and write
Goff, Roy; Hired man; W; W; 17; Single; b. New York; Both parents b. New York; Speaks English; Farm laborer; Working out; Wage earner; Employed full year; Can read and write
In the 1920 US Census for District 67, Canandaigua, Ontario County, New York the family of William M. Barnum was enumerated as follows:
Dwelling #164; Family #168
Barnum, William M.; Owns farm home free of mortgage; M: W: 67; Married; Can read and write; b. New York; Both parents b. New York; Speaks English; Farmer; General farm; Farm Schedule 106
Barnum, Vina; Wife; F; W; 72; Married; Can read and write; b. New York; Both parents b. New York; Speaks English; No occupation
The family of his son Fred C. Barnum was living next door.