- 1 Thompson, John
- 3 Thompson, Thomas James, 1812-1881
- 5 Thomson, John
- 1 Thomson, Mr. (George), 1757-1851
- 1 Thonet Brothers
- 1 Thornbury Township, Pennsylvania
- 2 Thornbury, Walter, 1828-1876
- 1 Thornton, Edw. (Edward)
- 1 Thornton's Hotel
- 2 Thorp's Calico Print Works
- 2 Tho's S. Dixon & Sons
- 1 Thos W. Sparks (Firm)
- 1 Thos. A. Fahy Attorneys at Law
- 1 Thos. Fearey & Sons
- 1 Thos. J. Myers (Firm)
- 2 Thouron Avenue
- 6 Thread
- 2 Thread industry
- 1 Three Falls Glen, Pennsylvania
- 3 Three Living and Three Dead (Legend)
- 14 Three-quarter views
- 17 Three-story
- 6 Threshing
- 2 Thrift
- 4 Thrift shops
- 27 Thrones
- 1 Thumbelina
- 1 Thunderstorms
- 1 Thunsche (Firm)
- 1 Thunsche crockery exhibit
- 1 Thuringia, Germany
- 1 Thurston, Robert M.
- 1 Thurston's Testing Machine
- 1 Tiaras
- 1 Tichenor Felt Hat Co.
- 6 Ticket offices
- 9 Tickets
- 2 Ticknor, William Davis, 1810-1864
- 1 Tidal waves
- 1 Tidelines
