- P. A. Preston Letter, 18592
- P. L. Kemble and Company ledger, 18662
- Papers of John A. Washington III, 1798/1940186
- Parke Rouse "The Great Wagon Road from Philadelphia to the South" manuscript, 197210
- Patrick Hinely Collection, 1973/20152
- Paul Ayres Rockwell papers, 1914/1985, bulk 1915/19802
- Paxton Family collection, 1847/2023, bulk 1900/198047
- Peabody Summer Normal School Pamphlet, 19002
- Pendleton Family correspondence, 1857/18792
- Peoples National Bank collection, 1904/19442
- Peter Agelasto Records, 1983/19842
- Philander Chase letter to Rev. C. Jones, 1830/18452
- Philbrick Family Papers, 1841/1865, bulk 1841/18432
- Phoenix Literary Society Ledger, 1867/18752
- Photo Views Company Postcards, 1930/19409