- 4 Anthony, of Egypt, Saint, ca. 250-355 or 6
- 1 Anthracite
- 2 Anthracite Building
- 1 Antiaircraft guns
- 3 Anti-Catholicism
- 3 Antietam Creek
- 1 Antietam, Battle of, Md., 1862
- 1 Antimony
- 1 Anti-Nazi movement
- 746 Antiphonaries
- 1 Antiques Picker
- 2 Antiquities
- 2 Antlers
- 1 Antoine Bedros (Firm)
- 1 Antoine, Paul Gabriel, 1678-1743
- 1 Anton Bohm (Firm)
- 1 Anton Dreher (Firm)
- 1 Anton Horner (Firm)
- 3 Anvils
- 1 Anxiety
- 37 Apartment houses
- 2 Apathy
- 2 Apes
- 1 Apiaries
- 2 Apollonia, Saint, d. 249
- 85 Apostles
- 1 Apple orchards
- 1 Apple parers
- 30 Apples
- 1 Appletree Alley
- 1 Appletree Alley
- 2 Appletree Street
- 2 Appletree Street
- 11 Appliance stores
- 2 Appomattox, Virginia
- 1 Appraisers Building
- 3 Apprentices
- 3 Apprentices Library
- 2 Appropriation (budgetary)
- 3 Approval