Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Armenia (historical) | Populated Place | 193 | Washington | 39 13 30 N | 081 42 04 W |
| Armington Airport | Airport | 251 | Ashtabula | 41 43 45 N | 080 52 44 W |
| Armington Hall | Building | 332 | Wayne | 40 48 49 N | 081 56 13 W |
| Armington Lake | Reservoir | 234 | Ashtabula | 41 45 06 N | 080 52 59 W |
| Armington Lake Dam | Dam | 234 | Ashtabula | 41 45 06 N | 080 52 59 W |
| Armington Physical Education Center | Building | 335 | Wayne | 40 48 43 N | 081 55 59 W |
| Armitage | Populated Place | 208 | Athens | 39 20 44 N | 082 05 46 W |
| Armory Fieldhouse | Building | 238 | Hamilton | 39 07 55 N | 084 30 51 W |
| Armour School (historical) | School | 359 | Holmes | 40 33 10 N | 081 52 21 W |
| Armrel-Byrnes Heliport | Airport | 262 | Hamilton | 39 16 27 N | 084 22 04 W |
| Armstrong | Populated Place | 277 | Wayne | 40 54 44 N | 082 00 40 W |
| Armstrong and Beighley Ditch | Canal | 236 | Seneca | 41 07 38 N | 083 17 13 W |
| Armstrong Burials (historical) | Cemetery | 189 | Ross | 39 19 54 N | 082 58 32 W |
| Armstrong Cemetery | Cemetery | 379 | Holmes | 40 38 16 N | 081 51 41 W |
| Armstrong Cemetery | Cemetery | 317 | Logan | 40 19 05 N | 083 58 44 W |
| Armstrong Cemetery | Cemetery | 355 | Morrow | 40 36 51 N | 082 49 18 W |
| Armstrong Cemetery | Cemetery | 271 | Seneca | 41 07 29 N | 082 56 41 W |
| Armstrong Cemetery | Cemetery | 308 | Stark | 40 45 04 N | 081 33 48 W |
| Armstrong Cemetery | Cemetery | 270 | Wyandot | 40 49 55 N | 083 26 50 W |
| Armstrong Chapel United Methodist Church | Church | 260 | Hamilton | 39 09 41 N | 084 20 52 W |
| Armstrong Park | Park | 271 | Auglaize | 40 32 55 N | 084 22 48 W |
| Armstrong Ridge | Ridge | 299 | Washington | 39 34 29 N | 081 11 39 W |
| Armstrong Run | Stream | | Carroll | 40 41 09 N | 081 12 04 W |
| Armstrong Run | Stream | | Knox | 40 23 54 N | 082 30 03 W |
| Armstrong School (historical) | School | 251 | Guernsey | 40 05 16 N | 081 30 30 W |
| Armstrong School (historical) | School | 292 | Morgan | 39 32 07 N | 081 58 56 W |
| Armstrong School (historical) | School | 218 | Paulding | 41 12 31 N | 084 42 31 W |
| Armstrongs Cemetery | Cemetery | 236 | Belmont | 39 54 33 N | 080 54 41 W |
| Armstrongs Mills | Populated Place | 231 | Belmont | 39 54 29 N | 080 56 05 W |
| Armstrongs Mills Post Office | Post Office | 229 | Belmont | 39 54 30 N | 080 56 04 W |
| Arnett Cemetery | Cemetery | 268 | Auglaize | 40 31 57 N | 084 17 51 W |
| Arnett Hall | Building | 307 | Greene | 39 42 57 N | 083 52 44 W |
| Arney Run | Stream | | Fairfield | 39 36 49 N | 082 39 29 W |
| Arnheim | Populated Place | 288 | Brown | 38 56 00 N | 083 49 39 W |
| Arnheim Cemetery | Cemetery | 296 | Brown | 38 55 41 N | 083 49 42 W |
| Arnheim Post Office (historical) | Post Office | 281 | Brown | 38 55 57 N | 083 49 44 W |
| Arnold | Populated Place | 292 | Union | 40 08 31 N | 083 15 03 W |
| Arnold Cemetery | Cemetery | 301 | Montgomery | 39 49 54 N | 084 22 14 W |
| Arnold Cemetery | Cemetery | 321 | Wayne | 40 47 07 N | 081 44 00 W |
| Arnold Park | Park | 254 | Licking | 40 03 33 N | 082 25 21 W |
| Arnold Post Office (historical) | Post Office | | Union | 40 08 30 N | 083 15 05 W |
| Arnold School | School | 335 | Summit | 40 59 36 N | 081 38 35 W |
| Arnold School (historical) | School | 177 | Hamilton | 39 15 44 N | 084 46 60 W |
| Arnold School (historical) | School | 259 | Pickaway | 39 35 39 N | 083 14 30 W |
| Aronoff Center for Design and Art | Building | 248 | Hamilton | 39 08 03 N | 084 31 10 W |
| Arps Hall | Building | 231 | Franklin | 40 00 07 N | 083 00 34 W |
| Arps School (historical) | School | 212 | Henry | 41 16 05 N | 084 03 25 W |
| Arron Kellar Farm Cemetery | Cemetery | 245 | Pickaway | 39 36 11 N | 083 14 14 W |
| Arrow Head Industrial Park | Locale | 192 | Lucas | 41 34 55 N | 083 40 22 W |
| Arrowbrook Baptist Church | Church | 283 | Greene | 39 40 55 N | 083 57 03 W |
| Arrowhead | Populated Place | 287 | Carroll | 40 33 13 N | 081 14 55 W |
| Arrowhead Beach | Populated Place | 190 | Lake | 41 41 56 N | 081 23 20 W |
| Arrowhead Country Club | Locale | 349 | Stark | 40 51 49 N | 081 24 37 W |
| Arrowhead Golf Club | Locale | 210 | Butler | 39 18 57 N | 084 26 52 W |
| Arrowhead Lake | Reservoir | 235 | Clermont | 39 06 40 N | 084 13 52 W |
| Arrowhead Lake | Reservoir | 329 | Mahoning | 40 54 24 N | 080 41 35 W |
| Arrowhead Lake Dam | Dam | 329 | Mahoning | 40 54 24 N | 080 41 35 W |
| Arrowhead Primary School | School | 326 | Summit | 41 05 28 N | 081 38 17 W |
| Arrowood Elementary School | School | 282 | Greene | 39 40 31 N | 083 57 33 W |
| Art and Drama Center | Building | 242 | Cuyahoga | 41 22 23 N | 081 50 56 W |
| Art Van Atta Park | Park | 275 | Montgomery | 39 50 25 N | 084 12 10 W |
| Artanna | Populated Place | 338 | Knox | 40 19 19 N | 082 18 38 W |
| Artemus Ward Elementary School | School | 232 | Cuyahoga | 41 26 12 N | 081 47 25 W |
| Artherholt Cemetery | Cemetery | 286 | Trumbull | 41 15 40 N | 080 33 20 W |
| Artheusa Springs Park | Park | 274 | Perry | 39 42 26 N | 082 11 60 W |
| Arthur | Populated Place | 219 | Paulding | 41 11 41 N | 084 21 39 W |
| Arthur Cemetery | Cemetery | 233 | Jackson | 38 55 46 N | 082 34 31 W |
| Arthur Dunlap Farm Cemetery | Cemetery | 233 | Pickaway | 39 37 04 N | 083 08 35 W |
| Arthur Ely Memorial Fire Station Number 1 | Building | 221 | Lorain | 41 22 07 N | 082 06 07 W |
| Arthur Genschaft Memorial Park | Park | 302 | Stark | 40 45 58 N | 081 31 00 W |
| Arthur Post Office (historical) | Post Office | 219 | Paulding | 41 11 40 N | 084 21 40 W |
| Arthur Road Middle School | School | 314 | Cuyahoga | 41 22 18 N | 081 26 28 W |
| Arthur School | School | 323 | Ashland | 40 52 00 N | 082 18 45 W |
| Artist Island | Island | 303 | Logan | 40 28 09 N | 083 53 06 W |
| Artz Park | Park | 270 | Butler | 39 30 06 N | 084 44 30 W |
| Asberry Cemetery | Cemetery | 299 | Perry | 39 34 40 N | 082 07 03 W |
| Asbery Chapel Cemetery | Cemetery | 340 | Monroe | 39 47 28 N | 081 00 35 W |
| Asbury | Populated Place | 253 | Hamilton | 39 03 38 N | 084 20 32 W |
| Asbury (historical) | Populated Place | 305 | Perry | 39 40 57 N | 082 17 35 W |
| Asbury Cemetery | Cemetery | 266 | Athens | 39 15 21 N | 081 57 13 W |
| Asbury Cemetery | Cemetery | 331 | Clark | 39 59 48 N | 083 56 14 W |
| Asbury Cemetery | Cemetery | 297 | Fairfield | 39 43 20 N | 082 33 21 W |
| Asbury Cemetery | Cemetery | 176 | Gallia | 38 46 03 N | 082 18 44 W |
| Asbury Cemetery | Cemetery | 231 | Hamilton | 39 03 57 N | 084 20 36 W |
| Asbury Cemetery | Cemetery | 286 | Hamilton | 39 11 21 N | 084 36 18 W |
| Asbury Cemetery | Cemetery | 307 | Hocking | 39 23 28 N | 082 18 08 W |
| Asbury Cemetery | Cemetery | 339 | Morrow | 40 28 52 N | 082 49 23 W |
| Asbury Cemetery | Cemetery | 309 | Union | 40 19 10 N | 083 23 07 W |
| Asbury Chapel | Church | 368 | Harrison | 40 17 10 N | 081 04 57 W |
| Asbury Chapel | Church | 344 | Monroe | 39 47 27 N | 081 00 33 W |
| Asbury Chapel | Church | 284 | Muskingum | 39 55 29 N | 082 10 39 W |
| Asbury Chapel Cemetery | Cemetery | 359 | Clark | 39 57 45 N | 083 38 58 W |
| Asbury Chapel Cemetery | Cemetery | 314 | Fayette | 39 30 48 N | 083 33 16 W |
| Asbury Chapel Cemetery | Cemetery | 267 | Ross | 39 11 51 N | 083 03 25 W |
| Asbury Church | Church | 359 | Clark | 39 57 42 N | 083 39 01 W |
| Asbury Church | Church | 244 | Franklin | 39 58 17 N | 082 57 37 W |
| Asbury Church | Church | 228 | Franklin | 39 53 44 N | 082 52 24 W |
| Asbury Church | Church | 178 | Gallia | 38 46 04 N | 082 18 45 W |
| Asbury Church | Church | 311 | Hocking | 39 23 30 N | 082 18 09 W |
| Asbury Church | Church | 227 | Van Wert | 40 58 31 N | 084 38 53 W |
| Asbury Church (historical) | Church | 360 | Clark | 39 57 43 N | 083 39 01 W |
| Asbury Creek | Stream | | Lawrence | 38 44 58 N | 082 33 19 W |
| Asbury Hills (subdivision) | Populated Place | 204 | Wood | 41 23 29 N | 083 39 45 W |
| Asbury Methodist Episcopal Cemetery | Cemetery | 228 | Franklin | 39 53 41 N | 082 52 23 W |
| Asbury Methodist Episcopal Church (historical) | Church | 168 | Hamilton | 39 06 42 N | 084 30 40 W |
| Asbury Park | Park | 182 | Lucas | 41 41 50 N | 083 33 45 W |
| Asbury Post Office (historical) | Post Office | 253 | Hamilton | 39 03 40 N | 084 20 30 W |
| Asbury Post Office (historical) | Post Office | 300 | Perry | 39 40 55 N | 082 17 35 W |
| Asbury Ridge | Ridge | 321 | Hocking | 39 24 19 N | 082 18 24 W |
| Asbury School (historical) | School | 320 | Fayette | 39 26 11 N | 083 34 25 W |