- 1 Thomas Haynes & Sons
- 1 Thomas Holme Branch
- 1 Thomas Martindale & Brothers
- 1 Thomas Stevens (Firm)
- 2 Thomas Tapling & Co.
- 2 Thomas W. Price Co.
- 1 Thomas Wood (Firm)
- 2 Thomas, Apostle, Saint
- 2 Thomas, Apostle, Saint, 1st cent. - Incredulity
- 8 Thomas, Aquinas, Saint, 1225?-1274
- 1 Thomas, F. Livery Stable
- 40 Thomas, Frank L.
- 1 Thomas, Roberts & Stevenson Co. Stove & Hollow Ware Foundry
- 1 Thompson Printing Co.
- 15 Thompson Street
- 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
