This is a list of properties and districts in Ohio that are listed on the National Register of Historic Places. There are over 4.000 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 (at least for all showing latitude and longitude coordinates below), may be seen in an online map by clicking on "Map of all coordinates".^{[lower-alpha 1]}

          This National Park Service list is complete through NPS recent listings posted May 3, 2024.^[1]

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^[2] and new weekly listings posted since then on the National Register of Historic Places web site.^[3] 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.^[4] 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.

More information County, # of Sites ...

County # of Sites 1 Adams 16 2 Allen 31 3 Ashland 19 4 Ashtabula 41 5 Athens 29 6 Auglaize 24 7 Belmont 28 8 Brown 26 9 Butler 92 10 Carroll 11 11 Champaign 35 12 Clark 42 13 Clermont 28 14 Clinton 18 15 Columbiana 45 16 Coshocton 20 17 Crawford 26 18.1 Cuyahoga: Cleveland 274 18.2 Cuyahoga: Other 162 18.3 Cuyahoga: Duplicates 4[lower-alpha 2] 18.4 Cuyahoga: Total 432 19 Darke 26 20 Defiance 12 21 Delaware 60 22.1 Erie: Sandusky 114 22.2 Erie: Other 65 22.3 Erie: Total 179 23 Fairfield 50 24 Fayette 17 25.1 Franklin: Columbus 177 25.2 Franklin: Other 176 25.3 Franklin: Total 353 26 Fulton 7 27 Gallia 8 28 Geauga 18 29 Greene 45 30 Guernsey 22 31.1a Hamilton: Cincinnati: Downtown 61 31.1b Hamilton: Cincinnati: East 132 31.1c Hamilton: Cincinnati: West 96 31.1d Hamilton: Cincinnati: Duplicates (1)[lower-alpha 3] 31.1e Hamilton: Cincinnati: Total 288 31.2 Hamilton: Other 99 31.3 Hamilton: Total 387 32 Hancock 14 33 Hardin 7 34 Harrison 7 35 Henry 4 36 Highland 27 37 Hocking 14 38 Holmes 16 39 Huron 18 40 Jackson 14 41 Jefferson 25 42 Knox 45 43 Lake 81 44 Lawrence 20 45 Licking 64 46 Logan 10 47 Lorain 124 48 Lucas 98 49 Madison 11 50 Mahoning 74 51 Marion 19 52 Medina 31 53 Meigs 9 54 Mercer 30 55 Miami 45 56 Monroe 10 57.1 Montgomery: Dayton 115 57.2 Montgomery: Other 44 57.2 Montgomery: Duplicates (1)[lower-alpha 4] 57.4 Montgomery: Total 158 58 Morgan 6 59 Morrow 15 60 Muskingum 84 61 Noble 11 62 Ottawa 31 63 Paulding 5 64 Perry 14 65 Pickaway 33 66 Pike 8 67 Portage 49 68 Preble 19 69 Putnam 10 70 Richland 68 71 Ross 44 72 Sandusky 12 73 Scioto 42 74 Seneca 45 75 Shelby 20 76 Stark 91 77.1 Summit: Akron 61 77.2 Summit: Other 125 77.3 Summit: Duplicates 1[lower-alpha 5] 77.4 Summit: Total 185 78 Trumbull 38 79 Tuscarawas 25 80 Union 10 81 Van Wert 8 82 Vinton 11 83 Warren 54 84 Washington 37 85 Wayne 21 86 Williams 7 87 Wood 33 88 Wyandot 10 (duplicates) (21)[lower-alpha 6] Total: 4,146

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• List of National Historic Landmarks in Ohio
• List of bridges on the National Register of Historic Places in Ohio