- Dr. John W.C. O'Neal Collection patient journals and daybooks, which contain his notes related to the Battle of Gettysburg and Confederate soldier burials.
- Elsie Singmaster Collection
- John S. Rice Collection
- Elizabeth Salome Myers Stewart Journal
- Donald McPherson Papers
- Elise Scharf Fox Collection
- Cunningham Papers
- Luther A. Gotwald Jr. Collection
- Mary Himes Collection
- Henry Stewart Collection
- John T. Riley Collection
- J. Howard Wert Collection
- Cox Collection
- Donald F. Garretson Collection
- M. Florence Gentzler Collection
- Annie B. Johnson (Deardorff) Collection
- McLean Papers
- C.C. Knox Papers
- Hennig Collection
- J. Arthur Wolfe Collection
- Willam J. Long Collection
- Philip B. Sharpe Collection
- George M. Zerfing Collection
- Robert M. & Thomas D. Shealer Collection
- Arthur Weaner Collection
- James H. Sweney Collection
- Wilbur E. Tilberg Collection
- Charles E. Trump Collection
- Maude B. (Reed) Kolda Estate Collection
The ACHS houses thousands of documents donated by individuals, families, andbusinesses including:
- Adams County Church & Cemetery files
- Family Genealogies: From "Abbott" to "Zinn."
- Marriage & Death Notices; Public Sales; and Cemetery Inscription Card Catalogue.
- Parish Register Transcripts: Many from old Lutheran and German Reformed congregations, and some from Presbyterian, Methodist, and Roman Catholic churches situated in the greater south-central and southeastern PA and Maryland areas.
- Various Historic Maps: Includes the 1858 and 1872 Adams County atlas maps.
- Profit & Non-Profit Businesses & Organizations Files.
- Family Files: Correspondence and other genealogical information pertaining to Adams County families. See our Family File Index for surnames.
- Account books for businesses
- Tombstone inscriptions-40,000 cards
- Individual cemetery files
- Septennial census, 1762-1821 (taken once every seven years)
- 1850-1860 Cumberland County
- 1850-1860 Franklin County
- Federal census indexes 1790, 1800, 1810, 1820, 1840, 1850, 1860, 1880
- Federal census 1790-1930 for Adams County
- Federal census 1790-1920 for York County
- 1850 for Baltimore & Frederick Co. MD
- History of PA Volunteers
- Revolutionary War Red and Black Series
- Civil War damage claims
- Civil War eye witness accounts
- WW II discharge papers
- Baptisms, marriages, etc. in over 300 Lutheran & many non-Lutheran Churches in Adams County and area
- Adams County Clergymen list. See the Adams County Clergymen Index.
- Individual church files
- County & business directories
- Telephone directories
- Deeds for Adams County properties not recorded at the courthouse