125 directories published between 1815 and 1945. The majority of the directories were published by J.F. Diffenbacher and R.L. Polk & Company. While most of the directories cover Pittsburgh and Allegheny City, a portion includes Homestead and nearby boroughs. This collection also contains several general business directories.
This is a list of orphanages active in Allegheny County over time. The library does not hold records from any of these orphanages, but this list provides guidance on how to find existing records from these organizations. See the Pennsylvania Department, third floor of Carnegie Library of Pittsburgh - Main, which specializes in local history and genealogy research.