William is a son of Adam L (b.Germany) and Sarah (Coonce) Bailar (b.England).
He was a widower (spouse's name not asked) at the time of his death.
occupation: Retired Engineer
residence: rural Oakland, Missouri
Informant: A L Bailar (son), Oakland, Missouri
DC 20852 (Image)

He appears on these two Censuses with his parents:
1860/ Ohio/ Champaign
Adam Bailar, 37y b.VA, occ: Farmer
Sarah M, 32y b.OH
E E (f), 7y b.OH
W C (m), 5y b.OH
S J (m), 3y b.OH
Mary A, 1y b.OH
plus one other

1870/ Illinois/ Mason
Adam BAYLOR, 47y b.OH, occ: Farmer
Sarah M, 39y b.OH
Nora E, 17y b.IL
William, 15y b.IL [?]
Silas, 12y b.IL
Mary A, 10y b.IL
Lorenzo, 8y b.IL (twin)
Loretta, 8y b.IL (twin)
Susan, 6y b.IL
Effie, 3y b.IL
plus one other

1880/ Nebraska/ Fillmore
Clayton Bailar, 24y b.OH, occ: Nursery Agent
(boarder; parents in same county)

William C Bailar (30y b.OH) and Nannie J Everett (24y b.PA) married 07 September 1887 in Geneva, Fillmore, Nebraska.
groom's father: Adam Bailar
groom's mother: Sarah E Coombs
bride's father: Nicholas Everett
bride's mother: Marcia Finney
"Nebraska Marriages, 1855-1995"
FamilySearch (no image available)

1900/ Kansas/ Washington
h/ William C Bailar, 45y b.Jan 1855 OH, M/13, occ: Day Laborer
w/ Nancy J, 39y b.May 1861 PA, mother of 4/4 living
d/ Hazel A, 11y b.Jun 1888 NE
d/ Gracy M, 9y b.Aug 1890 NE
s/ Adam L, 7y b.Oct 1892 NE
d/ Sarah M, 5y b.Jul 1894 NE

1910/ Kansas/ Shawnee
h/ W C Bailar, 55y b.OH, M1/23, occ: Engineer/?Stone crusher
w/ Nancy, 48y b.PA, mother of 4/4 living
d/ Hazel, 22y b.NE, occ: Garmet maker/Overall factory
d/ Grace, 20y b.NE, occ: Garmet maker/Overall factory
s/ Lorin, 18y b.NE, occ: ? / Railway Co
d/ Maud, 16y b.NE
residence: Topeka

1920/ Kansas/ Shawnee
h/ Wm C Bailar, 65y b.US, occ: Laborer/Street work
w/ Nancy, 58y b.PA, occ: Washer woman/at home
gd/ Erma Hartner, 8y b.KS
residence: 1510 E Fifth Avenue, Topeka

1930/ Oklahoma/ Washita
h/ W C Bailar, 75y b.OH, occ: Manager/Farming, * Veteran-No *
w/ Nancy J, 68y b.PA
brother/ S E, 72y b.OH, Wd, occ: Manager & Salesman/Bailar Equipment, * Veteran-No *

William appears here with his son-in-law and daughter:
1940/ Kansas/ Shawnee
h/ William D Hartman, 52y b.KS, G8, occ: Scale Man/John Morrell Co
w/ Grace M Hartman, 49y b.NE, G8
s/ Charles C Hartman, 24y b.KS, G8, occ; Laborer/John Morrell Co
d/ Helen W Hartman, 17y b.KS, H-4
d/ Velma J Hartman, 13y b.KS, G6
s/ Gary L Hartman, 6y b.KS, G1
father/ William A Bailar, 85y b.OH, Wd, G8
residence in 1935 (William Bailar): Shelby, Ohio
residence: 209 Taylor, Topeka

Link to daughter, Hazel A (Bailar) Tallmadge. Sent edit to link parents 03 February 2023.