Neighborhood: Central Lawrenceville
The original name of 49th Street was Lothrop Street.
In 1868, Pittsburgh’s modern sequence of numbered streets was created by renaming all the streets perpendicular to the Allegheny River; Lothrop Street became 49th Street. The renaming ordinance actually says that it was Mill Street that became 49th,[3, 4] but this is off by one; see 43rd Street.
Cridlebaugh, Bruce S. “Field notes: Changing Pittsburgh street names—from downtown to Lawrenceville.” Pghbridges.com: Bridges & tunnels of Allegheny County & Pittsburgh, PA, Feb. 9, 2000. http://pghbridges.com/articles/fieldnote_pghstnames.htm.
Killikelly, Sarah H. The History of Pittsburgh: Its rise and progress. B. C. & Gordon Montgomery Co., Pittsburgh, 1906, p. 534. DonsList.net HistPgh1909M; Google Books kXmloex-vr8C, poRU0YjqrzsC; HathiTrust 100122020; Historic Pittsburgh 00adc8925m; Internet Archive historyofpittsbu00kill, historypittsbur00killgoog.
“An ordinance changing the names of streets.” Pittsburgh city ordinance, 1868. Passed Aug. 31, 1868. Reprinted in the Pittsburgh Gazette, Sept. 2, 1868, p. 5 (Newspapers.com 86347563), Sept. 3, p. 3 (Newspapers.com 86347623), and Sept. 4, p. 3 (Newspapers.com 86347714).