Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Anna Cemetery | Cemetery | 315 | Shelby | 40 23 59 N | 084 10 24 W |
| Anna Elementary School | School | 312 | Shelby | 40 23 48 N | 084 10 35 W |
| Anna High School | School | 313 | Shelby | 40 23 49 N | 084 10 35 W |
| Anna J Miller Farm Cemetery | Cemetery | 359 | Holmes | 40 30 47 N | 081 49 10 W |
| Anna Post Office | Post Office | 316 | Shelby | 40 23 40 N | 084 10 20 W |
| Anna United Methodist Church | Church | 314 | Shelby | 40 23 45 N | 084 10 32 W |
| Annapolis | Populated Place | 347 | Jefferson | 40 24 40 N | 080 51 47 W |
| Annapolis Cemetery | Cemetery | 334 | Jefferson | 40 24 36 N | 080 51 49 W |
| Annapolis Post Office (historical) | Post Office | 341 | Jefferson | 40 24 40 N | 080 51 49 W |
| Annehurst Elementary School | School | 270 | Franklin | 40 07 27 N | 082 57 43 W |
| Annie Oakley Park | Park | 318 | Darke | 40 05 57 N | 084 37 48 W |
| Anniversary Hall | Building | 202 | Gallia | 38 52 55 N | 082 22 45 W |
| Annointed Church of the Living God | Church | 198 | Hamilton | 39 09 55 N | 084 26 60 W |
| Annointed World Fellowship Church | Church | 187 | Hamilton | 39 10 34 N | 084 27 60 W |
| Annunciation Catholic Church | Church | 238 | Cuyahoga | 41 25 35 N | 081 46 45 W |
| Annunciation Greek Orthodox Church | Church | 207 | Cuyahoga | 41 28 57 N | 081 41 27 W |
| Annunciation Greek Orthodox Church | Church | 322 | Summit | 41 04 43 N | 081 30 31 W |
| Annunciation School | School | 238 | Cuyahoga | 41 25 35 N | 081 46 43 W |
| Annunciation School | School | 204 | Hamilton | 39 08 47 N | 084 31 10 W |
| Annunciation-Saint John Parish School | School | 312 | Summit | 41 04 22 N | 081 29 17 W |
| Annwood Park | Park | 235 | Hamilton | 39 07 52 N | 084 27 60 W |
| Anshe Emeth Cemetery | Cemetery | 210 | Cuyahoga | 41 28 46 N | 081 43 40 W |
| Anshe Emeth Cemetery | Cemetery | 331 | Mahoning | 41 07 53 N | 080 39 32 W |
| Ansonia | Populated Place | 304 | Darke | 40 12 52 N | 084 38 13 W |
| Ansonia Cemetery | Cemetery | 306 | Darke | 40 12 50 N | 084 37 06 W |
| Ansonia Christian Church | Church | 306 | Darke | 40 12 48 N | 084 38 17 W |
| Ansonia Elementary School | School | 305 | Darke | 40 12 57 N | 084 38 17 W |
| Ansonia High School | School | 303 | Darke | 40 12 53 N | 084 38 19 W |
| Ansonia Methodist Church | Church | 306 | Darke | 40 12 46 N | 084 38 19 W |
| Ansonia Middle School | School | 306 | Darke | 40 12 55 N | 084 37 43 W |
| Ansonia Post Office | Post Office | 305 | Darke | 40 12 50 N | 084 38 15 W |
| Anstine Hill | Summit | 337 | Hardin | 40 35 31 N | 083 50 19 W |
| Anthony | Populated Place | 280 | Athens | 39 14 10 N | 081 58 57 W |
| Anthony Mining Company Dam | Dam | 341 | Jefferson | 40 28 24 N | 082 40 54 W |
| Anthony Mining Company Pond | Reservoir | 341 | Jefferson | 40 28 24 N | 082 40 54 W |
| Anthony Post Office (historical) | Post Office | 272 | Athens | 39 14 10 N | 081 58 60 W |
| Anthony Run | Stream | | Highland | 39 13 07 N | 083 48 26 W |
| Anthony Wayne Bridge | Bridge | 174 | Lucas | 41 38 27 N | 083 32 01 W |
| Anthony Wayne Elementary School | School | 214 | Defiance | 41 15 37 N | 084 23 24 W |
| Anthony Wayne Elementary School | School | 236 | Van Wert | 40 52 39 N | 084 35 04 W |
| Anthony Wayne Elementary School | School | 206 | Warren | 39 33 11 N | 084 18 44 W |
| Anthony Wayne Elementary School (historical) | School | 265 | Cuyahoga | 41 29 19 N | 081 36 06 W |
| Anthony Wayne High School | School | 196 | Lucas | 41 31 57 N | 083 46 48 W |
| Anthony Wayne School | School | 302 | Clark | 39 55 44 N | 083 45 53 W |
| Anthony Wayne Trail | Trail | 201 | Lucas | 41 25 45 N | 083 50 35 W |
| Antibantam School (historical) | School | 262 | Clermont | 39 00 18 N | 084 06 52 W |
| Antietam (historical) | Populated Place | 330 | Trumbull | 41 19 57 N | 080 35 54 W |
| Antietam Post Office (historical) | Post Office | 330 | Trumbull | 41 19 55 N | 080 35 54 W |
| Antioch | Populated Place | 277 | Madison | 39 45 58 N | 083 16 18 W |
| Antioch | Populated Place | 326 | Monroe | 39 39 36 N | 081 04 04 W |
| Antioch Baptist Church | Church | 185 | Butler | 39 26 40 N | 084 31 46 W |
| Antioch Baptist Church | Church | 184 | Lucas | 41 43 02 N | 083 33 57 W |
| Antioch Baptist Church | Church | 205 | Lucas | 41 33 35 N | 083 49 34 W |
| Antioch Baptist Church | Church | 292 | Mahoning | 41 07 11 N | 080 40 19 W |
| Antioch Baptist Church | Church | 317 | Stark | 40 48 05 N | 081 21 49 W |
| Antioch Baptist Church | Church | 302 | Summit | 41 04 15 N | 081 32 48 W |
| Antioch Cemetery | Cemetery | 205 | Adams | 38 51 32 N | 083 19 06 W |
| Antioch Cemetery | Cemetery | 311 | Coshocton | 40 18 17 N | 081 59 35 W |
| Antioch Cemetery | Cemetery | 329 | Highland | 39 20 53 N | 083 36 42 W |
| Antioch Cemetery | Cemetery | 250 | Hocking | 39 33 26 N | 082 28 50 W |
| Antioch Cemetery | Cemetery | 250 | Jackson | 38 57 08 N | 082 37 53 W |
| Antioch Cemetery | Cemetery | 314 | Monroe | 39 39 53 N | 081 04 09 W |
| Antioch Cemetery | Cemetery | 299 | Morgan | 39 33 06 N | 081 54 20 W |
| Antioch Cemetery | Cemetery | 316 | Muskingum | 39 47 23 N | 081 57 49 W |
| Antioch Cemetery | Cemetery | 303 | Preble | 39 42 00 N | 084 37 55 W |
| Antioch Cemetery | Cemetery | 221 | Putnam | 40 58 33 N | 084 20 35 W |
| Antioch Christian Church | Church | 276 | Madison | 39 45 53 N | 083 16 12 W |
| Antioch Church | Church | 208 | Adams | 38 51 32 N | 083 19 05 W |
| Antioch Church | Church | 264 | Allen | 40 41 19 N | 084 14 32 W |
| Antioch Church | Church | 226 | Jackson | 38 57 11 N | 082 38 20 W |
| Antioch Church | Church | 288 | Montgomery | 39 47 48 N | 084 22 19 W |
| Antioch Church | Church | 301 | Morgan | 39 33 06 N | 081 54 18 W |
| Antioch Church | Church | 221 | Putnam | 40 58 33 N | 084 20 32 W |
| Antioch Church | Church | 244 | Van Wert | 40 49 46 N | 084 38 54 W |
| Antioch Church | Church | 226 | Vinton | 39 14 36 N | 082 36 38 W |
| Antioch Church | Church | 206 | Wood | 41 22 19 N | 083 47 18 W |
| Antioch Church (historical) | Church | 309 | Preble | 39 42 02 N | 084 38 08 W |
| Antioch College | School | 308 | Greene | 39 48 00 N | 083 53 17 W |
| Antioch Fire Baptized Holiness Church | Church | 233 | Hamilton | 39 08 12 N | 084 29 39 W |
| Antioch Missionary Baptist Church | Church | 209 | Cuyahoga | 41 29 59 N | 081 37 28 W |
| Antioch Post Office | Post Office | 326 | Monroe | 39 39 35 N | 081 04 04 W |
| Antioch School (historical) | School | 203 | Adams | 38 51 32 N | 083 19 07 W |
| Antioch School (historical) | School | 282 | Clermont | 38 54 02 N | 084 03 35 W |
| Antioch School (historical) | School | 245 | Hocking | 39 33 22 N | 082 28 51 W |
| Antioch School (historical) | School | 276 | Madison | 39 45 48 N | 083 16 08 W |
| Antioch School (historical) | School | 318 | Muskingum | 39 47 28 N | 081 57 47 W |
| Antioch United Presbyterian Church | Church | 227 | Franklin | 39 53 25 N | 082 58 13 W |
| Antiquity | Populated Place | 176 | Meigs | 38 56 49 N | 081 54 22 W |
| Antiquity Post Office (historical) | Post Office | 172 | Meigs | 38 56 50 N | 081 54 24 W |
| Antonian Dining Hall | Building | 308 | Jefferson | 40 22 35 N | 080 37 06 W |
| Antonis | Populated Place | 202 | Ross | 39 11 02 N | 082 55 39 W |
| Antonis Post Office (historical) | Post Office | 221 | Ross | 39 11 00 N | 082 55 40 W |
| Antonoff Pond | Reservoir | 306 | Mahoning | 40 58 48 N | 080 41 11 W |
| Antonoff Pond Dam | Dam | 306 | Mahoning | 40 58 48 N | 080 41 11 W |
| Antram School (historical) | School | 323 | Clinton | 39 30 09 N | 083 50 32 W |
| Antrim | Populated Place | 309 | Guernsey | 40 07 13 N | 081 21 30 W |
| Antrim Mennonite Church | Church | 310 | Guernsey | 40 07 28 N | 081 21 06 W |
| Antrim Park | Park | 228 | Franklin | 40 04 50 N | 083 02 05 W |
| Antrim Post Office (historical) | Post Office | 311 | Guernsey | 40 07 15 N | 081 21 29 W |
| Antrim Presbyterian Cemetery | Cemetery | 310 | Guernsey | 40 07 11 N | 081 21 26 W |
| Antwerp | Populated Place | 222 | Paulding | 41 10 53 N | 084 44 26 W |
| Antwerp Branch Library | Building | 222 | Paulding | 41 10 54 N | 084 44 43 W |
| Antwerp Community Park | Park | 223 | Paulding | 41 11 01 N | 084 44 38 W |
| Antwerp Elementary School | School | 222 | Paulding | 41 10 55 N | 084 44 34 W |
| Antwerp High School | School | 223 | Paulding | 41 10 54 N | 084 44 37 W |
| Antwerp Post Office | Post Office | 223 | Paulding | 41 10 46 N | 084 44 23 W |
| Antwerp Town Hall | Building | 221 | Paulding | 41 10 56 N | 084 44 27 W |
| Antwerp United Methodist Church | Church | 223 | Paulding | 41 10 56 N | 084 44 20 W |
| Anvil | Populated Place | 399 | Belmont | 39 59 29 N | 080 50 04 W |
| Anvil Post Office (historical) | Post Office | 391 | Belmont | 39 59 30 N | 080 50 04 W |