There are free, digitized Pennsylvania City Directories at Google Books.
City directories contain an alphabetized list of residents with their addresses, spouse’s name, profession, and often a reverse lookup by address. They often contain historical information about a locale and they’ll usually contain a separate business directory.
Pennsylvania City Directories at Google Books include:
- Pennsylvania – Polk’s Directory of the Marine Interests of the Great Lakes, 1884 (vessels)
- Lancaster County – Boyd’s Lancaster County Business Directory, 1859-60
- Allegheny – Thurston’s Directory of Pittsburgh and Allegheny Cities and adjoining boroughs, Thurston, 1860-61
- Allegheny – Thurston’s Directory of Pittsburgh and Allegheny Cities and adjoining boroughs, Thurston, 1860-61
- Pittsburgh – Alumni Directory, University of Pittsburgh, 1787-1916, volume II
- Pittsburgh – Riddle’s Pittsburgh City Directory for 1815
- Pittsburgh – Thurston’s Directory of Pittsburgh and Allegheny Cities and adjoining boroughs, Thurston, 1860-61
- Pittsburgh – Thurston’s Directory of Pittsburgh and Allegheny Cities and adjoining boroughs, Thurston, 1860-61
- Pittsburgh – City of Pittsburgh Philanthropic Agencies Directory, 1908
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