Ohio - Criteria: A (event)
| 103rd Ohio Volunteer Infantry Association Barracks |
| Adams, John And Maria, House |
| Adams School |
| Ada Pennsylvania Station and Railroad Park |
| Adelbert Hall, Case Western Reserve University |
| Administration Building, Lake Erie College |
| African Jackson Cemetery |
| Akey, James, Farm |
| Akron-Fulton International Airport Administration Building |
| Akron Jewish Center |
| Akron Post Office and Federal Building |
| Akron Public Library |
| Alcazar Hotel |
| Alexander, Dr. William S., House |
| Alexandra, The |
| Alkemeyer Commercial Buildings |
| Allen, Darlon, House |
| Alliance Bank Building |
| Alliance Clay Product Company |
| All Souls Unitarian-Universalist Church |
| Alta Public Library |
| Ambler Heights Historic District |
| American Can Company Building |
| American Felsol Company Building |
| Amherst Town Hall |
| Anderson Ferry |
| Anderson, Levi, House |
| Anderson Schoolhouse |
| Andres, Charles, House |
| Anna Town Hall |
| Ansel Road Apartment Buildings Historic District |
| Antioch Temple |
| Antwerp Norfolk and Western Depot |
| Apostolic Bethlehem Temple Church |
| Arcade Hotel |
| Arlington Avenue District |
| Armstrong Farm |
| Armstrong, Joseph, Farm |
| Arnold Homestead |
| Ashtabula County Courthouse Group |
| Ashtabula Harbor Light |
| Ashtabula Harbour Commercial District |
| Ashville Depot |
| Astrup Company Building, The |
| Athens B & O Train Depot |
| Athens County Infirmary |
| Athens Downtown Historic District |
| Athens Governmental Buildings |
| Athens State Hospital |
| Athens State Hospital Cow Barn |
| Athletic Club of Columbus |
| Augspurger, Frederick, Farm |
| Augspurger Grist Mill |
| Augspurger, John, Farm No. 1 |
| Augspurger, John, Farm No. 2 |
| Augspurger Paper Company Rowhouse #1 |
| Augspurger Paper Company Rowhouse #2 |
| Augspurger, Samuel, Farm |
| Augspurger, Samuel, House |
| Augspurger Schoolhouse |
| Ault-Weygandt Farm |
| Aurora Center Historic District |
| Aurora Train Station |
| Austin Hall |
| Austin-Magie Farm and Mill District |
| Austintown Log House |
| Avon Isle |
| Bair, Jacob H., House |
| Baker, John, Tavern |
| Baker Motor Vehicle Company Building |
| Baldwin Piano Company Building |
| Baldwin-Wallace College North Campus Historic District |
| Baldwin-Wallace College South Campus Historic District |
| Baltimore & Ohio Railroad Terminal |
| Bank Block Building |
| Bantam Ridge School |
| Barber Shop |
| Barnesville Baltimore and Ohio Railroad Depot |
| Barnesville Historic District |
| Barnhisel, Henry II, House |
| Barr Hotel |
| Batavia House |
| Bates-Cockrem House |
| Bath Township Hall |
| Bath Township School |
| Baumgardner, William, House and Farm Buildings |
| Bavarian Brewery |
| Bay View Hospital |
| Bazore Mill |
| Bear's Mill |
| Beasley Building |
| Beginning Point of the U.S. Public Land Survey |
| Belle Hall Covered Bridge |
| Bell, Hiram, Farmstead |
| Bellville Village Hall |
| Belmont Historic District |
| Belt Line and New York Central Freight House |
| Benedict, Reuben, House |
| Bennett Schoolhouse Road Covered Bridge |
| Berea Union Depot |
Data from United States Park Service and Wikidata
