Were your Elijah & Margaret Adams living in Pittsburgh, PA in 1880? I have been trying to examine the following Census entries in search of my Elijah Adams (b. 1848 Greene County, PA, d. after 1885, son of Elijah & Jane (Buchanan) Adams). I am at a process of elimination point now so please let me know if the guy below could be yours. Thanks!
Census Record of Pittsburgh, Allegheny County, PA 1880. Elijah Adams household, page 314D; National Archives micropublication T9, roll 1092. Adams: Elijah 35 PA PA PA painter, Margaret wife 35 PA PA PA
Another Elijah Adams (perhaps the same man) is listed in Pittsburgh in 1900, as follows.
Census Record of Pittsburgh, Allegheny County, PA 1900. Elijah Adams household, 10th Ward, SD 18, ED 134, sheet 10; National Archives micropublication T653, roll 1358. Adams: Elijah (Mar. 1844) 56 (m. 11) PA PA PA house painter, Sophia wife (May 1848) 52 (m. 11) 0ch-0 PA PA PA