Ohio - Criteria: A (event)
| Bergstresser Covered Bridge |
| Berry Brothers Bolt Works |
| Berwick Hotel |
| Bethel Methodist Episcopal Church |
| Bieber, George, House and Farm |
| Bigelow, Charles H., House |
| Big Four Depot |
| Bimm Fireproof Warehouse |
| Bingham Company Warehouse |
| Bing's Hotel |
| Bissman Block |
| Black, H., and Company Building |
| Black River Viaduct, Baltimore And Ohio Railroad |
| Blackwood Covered Bridge |
| "Blaine Hill ""S"" Bridge" |
| Blume High School |
| Boeckling, G. A., House |
| B & O Freight Terminal |
| Bohemian National Hall |
| Boneyfiddle Commercial Disrict |
| B & O Railroad Viaduct |
| Born Capital Brewery Bottling Works |
| Boss Manufacturing Company, The |
| Boston Mills Historic District |
| Botzum Farm |
| Bowman Mill Covered Bridge |
| Bowman's Distillery |
| Bradford Junction Interlocking Tower |
| Bradford, Robert, House |
| Bradford Shoe Company Building |
| Brandville School |
| Brecksville Trailside Museum |
| Brelsford-Seese House |
| Bretz Farm |
| Brewster Railroad YMCA/Wandle House |
| Brick Tavern House |
| Bridenbaugh District No. 3 Schoolhouse |
| Bright, John, Covered Bridge |
| Broad Street Apartments |
| Broad Street Christian Church |
| Broadway Avenue Historic District |
| Broadway Bridge |
| Broadway Building |
| Brookdale Farm |
| Brooklyn Centre Historic District |
| Brown, Charles, Gothic Cottage |
| Brownell School and Annex |
| Brown-Gorman Farm |
| Brown, Jim, Tavern |
| Brown Township Building |
| Brown-Wing House |
| Brubaker Covered Bridge |
| Bruce-Macbeth Engine Company |
| Brumback Library |
| Brumberg Building |
| Brunswick-Balke-Collender Building |
| Bryant Building |
| Buckeye State Building and Loan Company Building |
| Bucyrus Commercial Historic District |
| Budd Dairy Company |
| Buehl House |
| Buffington Island |
| Building at 3101 Euclid Avenue |
| Building at 620-622 Vine Street |
| Bull, T.J. and Sarah, House |
| Bunker Hill House |
| Burnham, Henry, House |
| Burrell, Jabez and Robbins, House and Cheese Factory |
| Burr, George, House |
| Burt Building |
| Burt's Theater |
| Burt, William, House |
| Butler County Courthouse |
| Buxton Inn |
| Caldwell, Samuel, House |
| Caledonia Bowstring Bridge |
| Cambridge Arms |
| Camden Public School |
| Campbell School |
| Camp Chase Site |
| Camp Manatoc Dining Hall |
| Camp Manatoc Legion Lodge |
| Canal Warehouse |
| Canal Winchester School |
| Carnegie Library |
| Carnegie Library (Old Wilberforce University Campus) |
| Carroll, John, University North Quad Historic District |
| Carroll Township Hall |
| Cary, Freeman Grant, Pleasant Hill Academy |
| Cascade Locks Historic District |
| Casement House |
| Cassella Catholic Church and Rectory |
| Casstown Lutheran Stone Church |
| Catawba Island Wine Company |
| Caxton Building |
| Cedar Point Light |
| Cedarville Opera House |
| Central Branch, National Home for Disabled Volunteer Soldiers |
| Central Building of the Columbus Young Men's Christian Association |
| Central College Presbyterian Church |
Data from United States Park Service and Wikidata
