Ohio - Area of significance: Politics/Government
| Adams, George W., House |
| Adena (Thomas Worthington House) |
| Administration Building-United States Industrial Reformatory |
| Anna Town Hall |
| Ashtabula County Courthouse Group |
| Ashtabula Post Office and Federal Building |
| Athens Downtown Historic District |
| Athens Governmental Buildings |
| Bagby-Hossler House |
| Bath Township Hall |
| Beall, Gen. Reasin, House |
| Beebe, Horace Y., House |
| Bellevue |
| Benninghofen House |
| Bolton, Chester and Frances, House |
| Brown Township Building |
| Bryan Downtown Historic District |
| Bucyrus Commercial Historic District |
| Butler County Courthouse |
| Camp Chase Site |
| Carroll Township Hall |
| Cary, Hiram W., House |
| Cedarville Opera House |
| Central Branch, National Home for Disabled Volunteer Soldiers |
| Chester Town Hall |
| Chillicothe Business District |
| Chillicothe's Old Residential District |
| Chillicothe Veterans Administration Hospital |
| City Hall |
| City Hall Annex |
| Cockerill House |
| College Hill Town Hall |
| Columbia Town Hall |
| Congregational Church of Christ |
| Connecticut Land Company Office |
| Convoy Opera House-City Hall-Firehouse Building |
| Cooley Farms |
| Corwin Council House and Jail |
| Covington Historic Government Building |
| Cox, George B., House |
| Cox, Jacob D., House |
| Crafts William H., House |
| Curtis, Walter, House |
| Dairy Barn–Boys’ Industrial School |
| Dayton Daily News Building |
| Dayton Fire Station No. 14 |
| Delaware County Jail and Sheriff's Residence |
| Dew House |
| Doan House |
| Downtown Ashland Historic District |
| Downtown Painesville Historic District |
| Downtown Tiffin Historic District |
| Downtown Xenia Historic District |
| Drill Hall-Boys’ Industrial School |
| Duncarrick |
| Eastgate Apartments Historic District |
| East Town Street Historic District |
| Fabing, Frederick, House |
| Federal Land Office |
| Ferguson, Andrew, House |
| Findlay Downtown Historic District |
| First Presbyterian Church of Wapakoneta |
| Follett-Moss-Moss Residences |
| Franklinton Post Office |
| Friendly Grove |
| Garfield, James A., House |
| Garford, Arthur L., House |
| Georgetown Historic District |
| Gibson House |
| Giddings, Joshua Reed, Law Office |
| Glendale Police Station |
| Glendale Steps |
| Grand Army of the Republic Memorial Hall |
| Grant, Ulysses S., Boyhood Home |
| Greenwood Farm |
| Griffin, A. B.,-O. H. Griffin House |
| Griffin, Alexander B., House |
| Hamilton Downtown Historic District |
| Hardin County Courthouse |
| Harding Tomb |
| Harding, Warren G., House |
| Harmon Building-Ohio Reformatory for Women |
| Harrison, Gen. William Henry, Headquarters |
| Harrison, William Henry, Tomb State Memorial |
| Hayes, Rutherford B., House |
| Henry County Courthouse |
| Henry County Sheriff's Residence and Jail |
| Highland County Courthouse |
| Hill, James Delos, House |
| Hughes Manor |
| Ikirt House |
| James A. Garfield National Historic Site |
| James, Charles Worth, House |
| Jefferson Town Hall |
| John Sherman Birthplace |
| Jones, Elam, Public House |
| Kendall, Virginia, State Park Historic District |
| Kenton Courthouse Square Historic District |
| Kirker, Gov. Thomas, Homestead |
| Knapp, William, House |
Data from United States Park Service and Wikidata
