page_title: National Register of Historic Places listings in Ohio
section_title: Current listings by county
hierarchical_section_title: National Register of Historic Places listings in Ohio / Current listings by county
caption_attribution_description: English: Montage of the Mac-O-Chee and Mac-A-Cheek Castles. Located approximately ¾ mile apart, the Castles are located along State Route 245 east of West Liberty in Monroe Township, Logan County, Ohio, United States. Built in 1864, they are operated as historic house museums, and under the name of "Abram S. Piatt House and Donn S. Piatt House", they are listed on the National Register of Historic Places.
context_page_description: This is a list of properties and districts in Ohio that are listed on the National Register of Historic Places. There are over 3,900 in total. Of these, 73 are National Historic Landmarks. There are listings in each of Ohio's 88 counties.
  The locations of National Register properties and districts, may be seen in an online map by clicking on "Map of all coordinates".
  This National Park Service list is complete through NPS recent listings posted August 21, 2020.
context_section_description: The following are approximate tallies of current listings by county. These counts are based on entries in the National Register Information Database as of April 24, 2008 and new weekly listings posted since then on the National Register of Historic Places web site. There are frequent additions to the listings and occasional delistings and the counts here are approximate and not official. New entries are added to the official Register on a weekly basis.  Also, the counts in this table exclude boundary increase and decrease listings which modify the area covered by an existing property or district and which carry a separate National Register reference number.
caption: Abram S. Piatt House and Donn S. Piatt House, in Logan County
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