Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Nacco Slurry Refuse Impoundment | Reservoir | 328 | Belmont | 39 55 06 N | 080 59 35 W |
| Nace Corner | Populated Place | 253 | Pike | 39 04 02 N | 083 21 45 W |
| Nace Run | Stream | | Scioto | 38 40 34 N | 083 06 25 W |
| Nachtrab Ditch | Canal | 193 | Lucas | 41 33 59 N | 083 44 28 W |
| Nafzger Park | Park | 226 | Fairfield | 39 55 01 N | 082 52 04 W |
| Nagel Road Park | Park | 258 | Hamilton | 39 04 53 N | 084 19 45 W |
| Nagg Island | Island | 176 | Lucas | 41 42 00 N | 083 26 60 W |
| Nagle Ditch | Canal | 337 | Madison | 39 45 17 N | 083 34 45 W |
| Nail Hollow | Valley | | Scioto | 38 54 31 N | 082 58 44 W |
| Nancy (historical) | Populated Place | 237 | Hocking | 39 23 24 N | 082 39 34 W |
| Nancy Branch | Stream | | Lawrence | 38 31 10 N | 082 24 05 W |
| Nancy Post Office (historical) | Post Office | 244 | Hocking | 39 23 25 N | 082 39 35 W |
| Nancy Run | Stream | | Jefferson | 40 37 25 N | 080 49 23 W |
| Nankin | Populated Place | 316 | Ashland | 40 55 17 N | 082 16 55 W |
| Nankin Cemetery | Cemetery | 320 | Ashland | 40 55 18 N | 082 16 34 W |
| Nankin Elementary School | School | 318 | Ashland | 40 55 16 N | 082 16 40 W |
| Nankin Post Office | Post Office | 316 | Ashland | 40 55 20 N | 082 16 55 W |
| Naomi | Populated Place | 218 | Henry | 41 29 10 N | 084 08 39 W |
| Naomi Missionary Baptist Church | Church | 204 | Cuyahoga | 41 28 38 N | 081 43 07 W |
| Naomi Post Office (historical) | Post Office | 218 | Henry | 41 29 10 N | 084 08 40 W |
| Napier | Populated Place | 248 | Washington | 39 22 25 N | 081 43 00 W |
| Napoleon | Populated Place | 207 | Henry | 41 23 32 N | 084 07 31 W |
| Napoleon High School | School | 207 | Henry | 41 23 25 N | 084 08 52 W |
| Napoleon Park | Park | 240 | Franklin | 39 58 09 N | 082 54 19 W |
| Napoleon Post Office | Post Office | 208 | Henry | 41 23 26 N | 084 07 36 W |
| Napoleon Public Library | Building | 207 | Henry | 41 23 30 N | 084 07 43 W |
| Narrows Pet Cemetery | Cemetery | 249 | Montgomery | 39 50 25 N | 084 13 40 W |
| Narrows Run | Stream | | Belmont | 39 54 19 N | 080 48 34 W |
| Narrows Run | Stream | | Monroe | 39 36 53 N | 080 56 09 W |
| Narrows Run | Stream | | Monroe | 39 40 53 N | 080 52 01 W |
| Narrows Run Church | Church | 201 | Monroe | 39 37 09 N | 080 56 38 W |
| Narva | Populated Place | 368 | Harrison | 40 19 02 N | 080 57 43 W |
| Nasby | Populated Place | 190 | Lucas | 41 37 49 N | 083 36 41 W |
| Nash Corners | Locale | 211 | Pickaway | 39 30 32 N | 082 58 21 W |
| Nash Hill | Summit | 353 | Portage | 41 09 12 N | 081 20 14 W |
| Nashport | Populated Place | 252 | Muskingum | 40 04 14 N | 082 10 33 W |
| Nashport Community Church | Church | 244 | Muskingum | 40 04 23 N | 082 10 44 W |
| Nashport Dike | Dam | 244 | Muskingum | 40 04 30 N | 082 09 23 W |
| Nashport Elementary School | School | 272 | Muskingum | 40 01 48 N | 082 06 22 W |
| Nashport Post Office | Post Office | 248 | Muskingum | 40 04 15 N | 082 10 35 W |
| Nashport Station (historical) | Locale | 242 | Muskingum | 40 02 49 N | 082 09 18 W |
| Nashville | Populated Place | 332 | Darke | 40 05 31 N | 084 44 40 W |
| Nashville | Populated Place | 373 | Holmes | 40 35 46 N | 082 06 44 W |
| Nashville | Populated Place | 271 | Miami | 39 57 55 N | 084 16 47 W |
| Nashville Cemetery | Cemetery | 333 | Darke | 40 05 32 N | 084 44 34 W |
| Nashville Elementary School | School | 367 | Holmes | 40 35 44 N | 082 06 28 W |
| Nashville Methodist Cemetery | Cemetery | 366 | Holmes | 40 35 46 N | 082 06 57 W |
| Nashville Methodist Church | Church | 371 | Holmes | 40 35 48 N | 082 06 57 W |
| Nashville Post Office | Post Office | 373 | Holmes | 40 35 45 N | 082 06 45 W |
| Nashville United Methodist Church | Church | 333 | Darke | 40 05 28 N | 084 44 41 W |
| Nason School (historical) | School | 308 | Darke | 40 17 03 N | 084 28 58 W |
| Nassau Astronomical Station | Building | 378 | Lake | 41 35 04 N | 081 04 42 W |
| Nast-Trinity United Methodist Church | Church | 166 | Hamilton | 39 06 35 N | 084 30 60 W |
| Nathan Hale Elementary School | School | 188 | Lucas | 41 39 25 N | 083 35 21 W |
| Nathan Hale Junior High School | School | 267 | Cuyahoga | 41 27 37 N | 081 36 28 W |
| Nathan Hale Park | Park | 265 | Cuyahoga | 41 22 20 N | 081 46 27 W |
| Nathanial Hawthorne Elementary School | School | 230 | Cuyahoga | 41 27 24 N | 081 46 45 W |
| Nathaniel R Jones Federal Building and United States Courthouse | Building | 263 | Mahoning | 41 06 02 N | 080 38 54 W |
| Nation Chapel Cemetery | Cemetery | 350 | Clark | 40 00 14 N | 083 31 57 W |
| Nation School (historical) | School | 302 | Butler | 39 32 53 N | 084 43 19 W |
| National Aeronautics and Space Administration John H. Glenn Research Center at Lewis Field | Locale | 196 | Erie | 41 22 25 N | 082 40 45 W |
| National Audubon Society | Locale | 256 | Montgomery | 39 52 22 N | 084 16 32 W |
| National Center for Tooling and Precision Components | Building | 188 | Lucas | 41 39 16 N | 083 36 21 W |
| National First Ladies' Library Education and Research Center | Building | 322 | Stark | 40 47 59 N | 081 22 26 W |
| National Heliport | Airport | 244 | Franklin | 39 56 06 N | 082 49 55 W |
| National Military Cemetery | Cemetery | 287 | Montgomery | 39 44 47 N | 084 15 53 W |
| National Pro Football Hall of Fame | Building | 333 | Stark | 40 49 14 N | 081 23 50 W |
| National Road Museum | Building | 263 | Muskingum | 39 58 37 N | 081 49 23 W |
| National Road Plaza Shopping Center | Locale | 263 | Franklin | 39 57 15 N | 083 06 22 W |
| National Shrine of Our Lady of Lebanon | Building | 287 | Mahoning | 41 07 51 N | 080 49 17 W |
| National Steamboat Monument | Park | | Hamilton | 39 05 48 N | 084 30 18 W |
| National Terminals Warehouse | Building | 192 | Cuyahoga | 41 30 01 N | 081 42 08 W |
| National Theater (historical) | Building | 159 | Hamilton | 39 06 00 N | 084 30 27 W |
| National Trail High School | School | 356 | Preble | 39 50 12 N | 084 43 20 W |
| National Trail Raceway | Locale | 274 | Licking | 39 57 32 N | 082 32 47 W |
| National Underground Railroad Freedom Center | Park | 149 | Hamilton | 39 05 46 N | 084 30 45 W |
| Nativity Blessed Virgin Mary Roman Catholic Church | Church | 186 | Lorain | 41 27 21 N | 082 10 21 W |
| Nativity Catholic Church | Church | 254 | Cuyahoga | 41 27 32 N | 081 37 06 W |
| Nativity Manor | Building | | Lorain | 41 27 21 N | 082 10 23 W |
| Nativity of Christ Orthodox Church | Church | 331 | Mahoning | 41 04 24 N | 080 38 33 W |
| Nativity of the Blessed Virgin Mary Church | Church | 290 | Mercer | 40 24 25 N | 084 33 03 W |
| Nativity School | School | 253 | Cuyahoga | 41 27 31 N | 081 37 08 W |
| Nativity School | School | 238 | Hamilton | 39 10 48 N | 084 25 38 W |
| Nativity School | School | 187 | Lorain | 41 27 18 N | 082 10 24 W |
| Nativity School | School | 188 | Lucas | 41 38 45 N | 083 34 13 W |
| Natural Gorge Trail | Trail | 197 | Gallia | 38 47 27 N | 082 21 25 W |
| Nature Trails Park | Park | 220 | Seneca | 41 07 33 N | 083 10 11 W |
| Nature Trails Park | Park | 184 | Wood | 41 36 45 N | 083 25 50 W |
| Nauvoo Elementary School | School | 182 | Scioto | 38 45 28 N | 083 01 40 W |
| Nauvoo Run | Stream | | Scioto | 38 45 07 N | 083 02 04 W |
| Nauvoo United Methodist Church | Church | 191 | Scioto | 38 45 21 N | 083 01 47 W |
| Navarre | Populated Place | 292 | Stark | 40 43 28 N | 081 31 19 W |
| Navarre Elementary School | School | 186 | Lucas | 41 38 07 N | 083 31 28 W |
| Navarre Elementary School | School | 284 | Stark | 40 43 19 N | 081 31 18 W |
| Navarre Marsh | Swamp | 175 | Ottawa | 41 35 35 N | 083 04 30 W |
| Navarre Park | Park | 180 | Lucas | 41 37 55 N | 083 30 37 W |
| Navarre Post Office | Post Office | 294 | Stark | 40 43 30 N | 081 31 19 W |
| Navarre Station (historical) | Locale | 300 | Stark | 40 44 01 N | 081 33 04 W |
| Navarre-Bethlehem Park | Park | 279 | Stark | 40 43 21 N | 081 30 39 W |
| Navy Park Housing Project (historical) | Populated Place | 223 | Cuyahoga | 41 27 26 N | 081 44 24 W |
| Naylor | Populated Place | 341 | Mahoning | 40 55 06 N | 080 58 22 W |
| Naylor Cemetery | Cemetery | 294 | Adams | 38 43 29 N | 083 31 08 W |
| Naylor Ditch | Canal | 338 | Mahoning | 40 54 35 N | 080 58 20 W |
| Naylors Run | Stream | | Meigs | 39 01 45 N | 082 01 35 W |
| Nazarene Baptist Church | Church | 196 | Cuyahoga | 41 30 58 N | 081 37 44 W |
| Nazarene Church | Church | 271 | Auglaize | 40 34 00 N | 084 11 58 W |
| Nazarene Church | Church | 279 | Greene | 39 40 53 N | 083 56 23 W |
| Nazarene Church | Church | 225 | Jackson | 39 07 15 N | 082 31 56 W |
| Nazarene Church | Church | 168 | Lawrence | 38 31 00 N | 082 40 10 W |
| Nazarene Church | Church | 272 | Wayne | 40 47 47 N | 081 56 29 W |