William B Head married Martha V Miller on 26 Dec 1844 in McDonough Co., IL (Illinois marriage records).

1850 census, McDonough Co., IL: HEAD; William B (26), Martha (20), Thos (4), Robert (3), Jefferson (2), Mary E (2M)
1860 census, Sciota, McDonough Co. IL: HEAD; WB (38), Martha (31), Thomas (14), Robert (13), Jefferson F (11), Mary (9), James (8), Eliza (6), Isabella (4), Jefferson M (2), George F (3M)
1865 census, Macomb, McDonough Co., IL - Bigger Head; 7 = 3M + 4F
1870 census, Platte, Andrew Co., MO: HEAD; William B (46), Martha (40), Thomas H (24), Robert F (23), Jefferson W (21), Mary E (19), James m (17), Ervy (16), Bell (15), Henry (13), George (10), Earnest (8), John (6), Burton (4), Clarence (3), Olive (Aug 1869)
1880 census, Emmett, McDonough Co., IL: HEAD; William (58), Marthy (51), Robert F (34), Charles E (18), John N 916), Wilson B (14), Clarence T (13), Josh O (10), Louas E (8), CLARK; Eva (26), Nelli J (5), Nany E (3)

The following obit found on a memorial (127414593) for a William B Head (1875-1907). Clearly not that William B.

Obit., in part, from The Macomb Journal, Thu, Mar 1, 1888, pg. ?
Wm. B. Head was buried in the Head Cemetery on the farm of his father on Tuesday. Nearly all of the family is buried there. He was the son of James & Isable Head and was born in Washington Co., Ky. As a youth, he came to Ill. with his parents and a large family of brothers and sisters, arriving in Emmet Twp., on Christmas Day, 1832. He married Miss Miller and afterwards lived in the same neighborhood until about the time of the Civil War. Then he moved to Missouri for several years. He then returned & lived in Emmet & Sciota Twps. until 2 years ago when he moved to Iowa where he was living when he died. He was the father of 17 children and was the brother of Thos. Head of Sciota.