- 1 William H. Wood, Attorney at Law
- 1 William Holzer (Firm)
- 1 William James Hogg & Co.
- 1 William Johnson (Firm)
- 1 William Kedward Dyeing Co.
- 2 William Lescaze and George Howe, architects
- 1 William M. Mackin, Tailor
- 2 William Nell, Sale Makers
- 5 William Penn Hotel
- 1 William Penn House
- 1 William Penn Tavern
- 1 William Penn Theatre
- 1 William Pepper (Monument)
- 1 William Seefeldt (Firm)
- 2 William Simpson & Sons
- 1 William W. Maull & Co.
- 1 William Wiler (Firm)
- 1 Williams & Ellis Lumber Yard
- 1 Williams, Ambrose
- 1 Williams, B. S.
- 2 Williams, Barney, 1824-1876
- 2 Williams, Barney, Mrs., 1828-1911
- 1 Williams, C.B. Tannery
- 1 Williams, Samuel, 1788-1853
- 1 Williams, Thomas Jr. & Co. Lumber Yard
- 4 Williamsburg, Virginia
- 2 Williamson & Cassedy
- 3 Williamson Bros.
- 1 Williamson, Thomas Roney, Architect
- 2 Williamstown, New Jersey
- 1 Willian, J.B.-La Grange Print Works
- 1 Willimantic Linen Co.
- 3 Willing, Thomas, 1731-1821
- 1 Willis Russell (Firm)
- 5 Willits Road
- 1 Willits, A. A. (Alphonso Albert), 1821-1913
- 1 Willmott, John, 19th cent.
- 1 Willow Brook Mills-Stone Brothers
- 2 Willow Grove Park
- 1 Willow Grove, Pennsylvania
