Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Hamler Elementary School | School | 216 | Henry | 41 13 44 N | 084 02 12 W |
| Hamler Post Office | Post Office | 216 | Henry | 41 13 45 N | 084 02 05 W |
| Hamlet | Populated Place | 268 | Clermont | 39 01 08 N | 084 11 59 W |
| Hamlet Post Office (historical) | Post Office | 267 | Clermont | 39 01 10 N | 084 12 00 W |
| Hamley Run | Populated Place | 201 | Athens | 39 23 51 N | 082 10 10 W |
| Hamley Run | Stream | | Athens | 39 23 39 N | 082 09 51 W |
| Hamley Run Post Office (historical) | Post Office | 201 | Athens | 39 23 50 N | 082 10 10 W |
| Hamlin Cemetery | Cemetery | 247 | Hancock | 41 05 54 N | 083 34 29 W |
| Hamlin Hill Park | Park | 250 | Montgomery | 39 48 38 N | 084 11 09 W |
| Hamm School (historical) | School | 256 | Seneca | 41 10 57 N | 082 53 59 W |
| Hamman Cemetery | Cemetery | 206 | Pike | 39 03 31 N | 082 57 06 W |
| Hamman Church | Church | 205 | Pike | 39 03 31 N | 082 57 07 W |
| Hammansburg | Populated Place | 215 | Wood | 41 13 35 N | 083 41 19 W |
| Hammel College | School | 316 | Summit | 41 04 37 N | 081 29 24 W |
| Hammer Creek | Stream | | Henry | 41 17 06 N | 083 53 25 W |
| Hammertown Lake | Reservoir | 212 | Jackson | 39 03 24 N | 082 41 06 W |
| Hammertown Lake Dam | Dam | 212 | Jackson | 39 03 24 N | 082 41 06 W |
| Hammond Airport | Airport | 348 | Stark | 40 54 47 N | 081 15 35 W |
| Hammond Crossroad | Populated Place | 379 | Harrison | 40 11 03 N | 080 57 21 W |
| Hammond Methodist Cemetery | Cemetery | 394 | Ashland | 40 44 58 N | 082 18 58 W |
| Hammond Park | Park | 305 | Columbiana | 40 36 16 N | 080 39 50 W |
| Hammond School (historical) | School | 294 | Holmes | 40 36 37 N | 081 54 01 W |
| Hammond School (historical) | School | 274 | Perry | 39 40 36 N | 082 04 26 W |
| Hammond School (historical) | School | 298 | Perry | 39 37 07 N | 082 17 41 W |
| Hammondsville | Populated Place | 210 | Jefferson | 40 33 27 N | 080 42 25 W |
| Hammondsville Cemetery | Cemetery | 214 | Jefferson | 40 33 12 N | 080 42 35 W |
| Hammons Cemetery | Cemetery | 228 | Putnam | 40 55 21 N | 084 22 12 W |
| Hampden Post Office (historical) | Post Office | 396 | Geauga | 41 36 14 N | 081 08 44 W |
| Hampson Cemetery | Cemetery | 272 | Fairfield | 39 48 09 N | 082 31 34 W |
| Hampstead | Populated Place | 298 | Montgomery | 39 40 51 N | 084 08 06 W |
| Hampton Cemetery | Cemetery | 281 | Madison | 39 56 23 N | 083 16 09 W |
| Hampton Park Christian Church | Church | 188 | Lucas | 41 40 58 N | 083 36 27 W |
| Hampton School (historical) | School | 301 | Hardin | 40 33 10 N | 083 29 06 W |
| Hampton Woods (subdivision) | Populated Place | 328 | Clark | 39 58 42 N | 083 56 35 W |
| Hamrick Airport | Airport | 248 | Mercer | 40 41 36 N | 084 46 50 W |
| Hanawalt School (historical) | School | 359 | Richland | 40 37 23 N | 082 35 25 W |
| Hanaway Bridge | Bridge | 254 | Fairfield | 39 37 06 N | 082 40 50 W |
| Hanby Middle School | School | 262 | Franklin | 40 07 28 N | 082 55 49 W |
| Hanby Park | Park | 265 | Franklin | 40 07 35 N | 082 55 44 W |
| Hanby Shopping Center | Locale | 261 | Franklin | 40 07 05 N | 082 55 42 W |
| Hance Cemetery | Cemetery | 253 | Van Wert | 40 42 51 N | 084 24 49 W |
| Hancock | Populated Place | 221 | Hancock | 41 09 19 N | 083 51 07 W |
| Hancock Cemetery | Cemetery | 384 | Licking | 40 10 11 N | 082 36 42 W |
| Hancock County | Civil | 247 | Hancock | 41 01 00 N | 083 40 00 W |
| Hancock County Childrens Home | Building | 246 | Hancock | 41 04 08 N | 083 38 58 W |
| Hancock County Courthouse | Building | 235 | Hancock | 41 02 19 N | 083 39 03 W |
| Hancock County Home | Building | 236 | Hancock | 41 03 17 N | 083 41 21 W |
| Hancock County Infirmary Cemetery | Cemetery | 235 | Hancock | 41 03 04 N | 083 41 20 W |
| Hancock County Jail | Building | 235 | Hancock | 41 02 21 N | 083 39 06 W |
| Hancock County Law Library | Building | 235 | Hancock | 41 02 19 N | 083 39 03 W |
| Hancock Elementary School | School | 181 | Erie | 41 26 10 N | 082 41 44 W |
| Hancock Junior High School | School | 219 | Muskingum | 39 56 39 N | 082 00 16 W |
| Hancock Pond | Lake | 335 | Licking | 39 59 51 N | 082 34 24 W |
| Hancock School (historical) | School | 381 | Licking | 40 10 17 N | 082 36 41 W |
| Handley Branch | Stream | | Lawrence | 38 42 11 N | 082 30 17 W |
| Handley House | Building | 259 | Franklin | 40 07 34 N | 082 56 15 W |
| Handworks Corners | Locale | 335 | Mahoning | 41 04 08 N | 080 43 57 W |
| Hanersville | Populated Place | 171 | Gallia | 38 50 08 N | 082 12 55 W |
| Hanesville | Populated Place | 194 | Meigs | 39 02 14 N | 082 13 07 W |
| Hanesville Post Office (historical) | Post Office | 193 | Meigs | 39 02 15 N | 082 13 05 W |
| Haney (historical) | Populated Place | 211 | Wood | 41 15 20 N | 083 45 58 W |
| Haney Ridge | Ridge | 324 | Monroe | 39 37 21 N | 081 12 36 W |
| Hanford | Populated Place | 235 | Franklin | 39 57 05 N | 082 56 53 W |
| Hanford Village Park | Park | 230 | Franklin | 39 57 08 N | 082 56 40 W |
| Hanger Cemetery | Cemetery | 344 | Logan | 40 16 07 N | 083 45 15 W |
| Hanging Rock | Populated Place | 165 | Lawrence | 38 33 36 N | 082 43 16 W |
| Hanging Rock Cemetery | Cemetery | 166 | Lawrence | 38 33 51 N | 082 42 49 W |
| Hanging Rock Post Office | Post Office | 165 | Lawrence | 38 33 35 N | 082 43 15 W |
| Haning Cemetery | Cemetery | 254 | Athens | 39 12 16 N | 082 08 52 W |
| Haning Hall | Building | 212 | Athens | 39 19 38 N | 082 06 11 W |
| Hankin Cemetery | Cemetery | 254 | Mercer | 40 38 02 N | 084 29 23 W |
| Hankins Run | Stream | | Fayette | 39 28 49 N | 083 28 13 W |
| Hanley Residence Hall | Building | 292 | Clark | 39 55 58 N | 083 48 43 W |
| Hanley School (historical) | School | 248 | Allen | 40 44 36 N | 084 21 32 W |
| Hanley Village | Populated Place | 436 | Richland | 40 41 45 N | 082 32 30 W |
| Hanna Cemetery | Cemetery | 319 | Crawford | 40 55 54 N | 082 44 37 W |
| Hanna Hall | Building | 326 | Knox | 40 22 19 N | 082 23 52 W |
| Hanna Hall | Building | 210 | Wood | 41 22 31 N | 083 38 23 W |
| Hanna House | Building | 272 | Butler | 39 30 25 N | 084 44 18 W |
| Hanna Perkins School | School | 213 | Cuyahoga | 41 30 23 N | 081 36 15 W |
| Hanna Playground | Park | 164 | Hamilton | 39 07 09 N | 084 31 20 W |
| Hannah J Ashton Middle School | School | 269 | Franklin | 39 57 13 N | 082 47 58 W |
| Hannah Pond (historical) | Lake | 175 | Lucas | 41 40 20 N | 083 17 30 W |
| Hannah Run | Stream | | Adams | 38 47 02 N | 083 36 10 W |
| Hannan Trace Elementary School | School | 238 | Gallia | 38 39 37 N | 082 16 15 W |
| Hannan Trace High School | School | 232 | Gallia | 38 39 40 N | 082 16 36 W |
| Hannash Cemetery | Cemetery | 372 | Monroe | 39 50 48 N | 081 18 08 W |
| Hannibal | Populated Place | 199 | Monroe | 39 40 02 N | 080 52 19 W |
| Hannibal Elementary School | School | 219 | Monroe | 39 40 11 N | 080 52 24 W |
| Hannibal Locks and Dam | Dam | 188 | Monroe | 39 40 01 N | 080 51 58 W |
| Hannibal Ridge | Ridge | 408 | Monroe | 39 40 38 N | 080 53 23 W |
| Hannibal United Methodist Church | Church | 199 | Monroe | 39 40 02 N | 080 52 20 W |
| Hanning Church | Church | 249 | Athens | 39 12 56 N | 082 04 09 W |
| Hannon Landing | Locale | 162 | Gallia | 38 35 32 N | 082 12 26 W |
| Hannon Park | Park | 242 | Butler | 39 31 12 N | 084 43 52 W |
| Hannum Airport | Airport | 359 | Portage | 41 15 52 N | 081 19 38 W |
| Hanover | Populated Place | 368 | Harrison | 40 21 58 N | 081 04 08 W |
| Hanover | Populated Place | 251 | Licking | 40 04 47 N | 082 15 40 W |
| Hanover (historical) | Populated Place | 259 | Butler | 39 25 42 N | 084 38 47 W |
| Hanover Cemetery | Cemetery | 336 | Delaware | 40 07 52 N | 082 46 41 W |
| Hanover Cemetery | Cemetery | 372 | Harrison | 40 22 12 N | 081 04 01 W |
| Hanover Cemetery | Cemetery | 262 | Licking | 40 04 37 N | 082 14 26 W |
| Hanover Church | Church | 273 | Licking | 40 04 35 N | 082 17 14 W |
| Hanover Post Office (historical) | Post Office | 253 | Licking | 40 04 50 N | 082 15 40 W |
| Hanover Presbyterian Church | Church | 244 | Licking | 40 04 54 N | 082 15 51 W |
| Hanover School | School | 277 | Butler | 39 26 09 N | 084 38 45 W |
| Hanoverton | Populated Place | 344 | Columbiana | 40 45 04 N | 080 56 13 W |
| Hanoverton | Post Office | 344 | Columbiana | 40 45 05 N | 080 56 14 W |
| Hanoverton Canal Town Historic District | Park | 344 | Columbiana | 40 45 03 N | 080 56 11 W |
| Hansbro School (historical) | School | 327 | Highland | 39 15 16 N | 083 34 16 W |