He married Hannah Horne. The Greely--Greeley Genealogy gives the parentage of the Amos who married Abigial Merrifield as Amos and Hannah (Horne) Wallingford. The genealogist Winthrop Alexander states that "this older Amos was, I imagine, the Amos P. of Rochester, N.H. who died 21 August 1825, at Rochester, aged 31. He married, 11 Feb. 1819, at Lebanon, Rhoda Blaisdell..." If this is true, where does Hannah Horne come in? One of Amos P.'s sons Jacob married a Lydia R. Horne. The Greely-Greeley Genealogy was written in 1905, so the information probably came from the family. Amos died in 1899, so it's possible that the author even asked him personally.
Amos Walllingford and Hannah Horne had the following child:
+ 97 i. Amos4 Wallingford was born 23 March 1815.