Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Groveport Golf Course | Locale | 222 | Franklin | 39 50 42 N | 082 52 44 W |
| Groveport Post Office | Post Office | 224 | Franklin | 39 51 03 N | 082 53 05 W |
| Groveport-Madison Elementary School | School | 225 | Franklin | 39 51 01 N | 082 52 51 W |
| Groveport-Madison Freshman High School | School | 226 | Franklin | 39 51 01 N | 082 52 48 W |
| Groveport-Madison High School | School | 225 | Franklin | 39 52 48 N | 082 53 07 W |
| Groveport-Madison Middle School | School | 230 | Franklin | 39 54 18 N | 082 51 16 W |
| Groveport-Madison Middle School South | School | 222 | Franklin | 39 51 30 N | 082 53 26 W |
| Grover Airport | Airport | 286 | Delaware | 40 13 14 N | 082 56 47 W |
| Grover Hill | Populated Place | 220 | Paulding | 41 01 09 N | 084 28 36 W |
| Grover Hill Elementary School | School | 221 | Paulding | 41 01 13 N | 084 28 46 W |
| Grover Hill Post Office | Post Office | 220 | Paulding | 41 01 08 N | 084 28 37 W |
| Groves Cemetery | Cemetery | 266 | Hocking | 39 25 04 N | 082 19 06 W |
| Groves Ridge | Ridge | 349 | Noble | 39 50 50 N | 081 24 20 W |
| Grub Run | Stream | | Fayette | 39 34 42 N | 083 17 28 W |
| Grubaugh School | School | 394 | Richland | 40 45 41 N | 082 32 19 W |
| Gruboak School (historical) | School | 208 | Lucas | 41 35 21 N | 083 49 32 W |
| Gruenwald Convent | Church | 295 | Mercer | 40 24 02 N | 084 33 05 W |
| Grueser Hollow | Valley | | Meigs | 39 04 23 N | 082 01 40 W |
| Gruetter Airport | Airport | 184 | Ottawa | 41 35 33 N | 083 22 32 W |
| Gruffing-Sandusky Airport | Airport | 176 | Erie | 41 25 59 N | 082 39 09 W |
| Guadalupe Church | Church | 273 | Mercer | 40 28 47 N | 084 31 27 W |
| Guardian Angel Cemetery | Cemetery | 238 | Hamilton | 39 04 27 N | 084 21 41 W |
| Guardian Angel Day School | School | 201 | Lucas | 41 42 45 N | 083 42 13 W |
| Guardian Angel School | School | 214 | Hamilton | 39 05 03 N | 084 22 39 W |
| Guardian Angels Catholic Church | Church | 213 | Hamilton | 39 05 05 N | 084 22 37 W |
| Guards Island | Island | 140 | Hamilton | 39 07 53 N | 084 48 28 W |
| Guerne | Populated Place | 334 | Wayne | 40 45 48 N | 081 53 46 W |
| Guernsey | Populated Place | 241 | Guernsey | 40 10 54 N | 081 35 32 W |
| Guernsey Community Center | Building | 245 | Guernsey | 40 10 57 N | 081 35 49 W |
| Guernsey County | Civil | 306 | Guernsey | 40 03 00 N | 081 30 59 W |
| Guernsey County Childrens Home | Building | 251 | Guernsey | 40 01 37 N | 081 35 42 W |
| Guernsey County Courthouse | Building | 268 | Guernsey | 40 01 31 N | 081 35 23 W |
| Guernsey County Historical Museum | Building | 263 | Guernsey | 40 01 35 N | 081 35 22 W |
| Guernsey County Law Library | Building | 268 | Guernsey | 40 01 31 N | 081 35 23 W |
| Guernsey County Public Library | Building | 267 | Guernsey | 40 01 33 N | 081 35 23 W |
| Guernsey Memorial Gardens | Cemetery | 247 | Guernsey | 40 01 33 N | 081 33 00 W |
| Guernsey Memorial Hospital | Hospital | 268 | Guernsey | 40 02 28 N | 081 34 38 W |
| Guernsey Post Office | Post Office | 240 | Guernsey | 40 10 55 N | 081 35 34 W |
| Guernsey-Noble Vocational School | School | 263 | Guernsey | 39 55 38 N | 081 31 15 W |
| Guess School (historical) | School | 298 | Hocking | 39 33 12 N | 082 17 52 W |
| Guest Run | Stream | | Clermont | 38 57 40 N | 084 06 23 W |
| Guest School (historical) | School | 342 | Stark | 40 42 53 N | 081 24 36 W |
| Guffey Lake | Reservoir | 242 | Montgomery | 39 36 42 N | 084 22 42 W |
| Guffey Lake Dam | Dam | 242 | Montgomery | 39 36 42 N | 084 22 42 W |
| Guggs Ford | Crossing | 244 | Preble | 39 40 50 N | 084 31 32 W |
| Guiding Light Tabernacle Church | Church | 184 | Lucas | 41 40 08 N | 083 34 54 W |
| Guiding Star School (historical) | School | 379 | Morrow | 40 35 46 N | 082 47 08 W |
| Guilford | Populated Place | 342 | Columbiana | 40 47 30 N | 080 51 58 W |
| Guilford Bog | Swamp | 338 | Columbiana | 40 47 40 N | 080 50 24 W |
| Guilford Cemetery | Cemetery | 367 | Medina | 41 01 29 N | 081 49 33 W |
| Guilford Lake | Reservoir | 347 | Columbiana | 40 47 42 N | 080 52 17 W |
| Guilford Lake Dam | Dam | 347 | Columbiana | 40 47 42 N | 080 52 17 W |
| Guilford Lake State Park | Park | 344 | Columbiana | 40 48 02 N | 080 52 45 W |
| Guilford School (historical) | School | 164 | Hamilton | 39 06 03 N | 084 30 18 W |
| Guinea Corners Cemetery | Cemetery | 283 | Huron | 41 03 11 N | 082 40 03 W |
| Guinea Corners Church | Church | 283 | Huron | 41 03 10 N | 082 40 03 W |
| Guinea School (historical) | School | 283 | Huron | 41 03 11 N | 082 40 03 W |
| Guise Park | Park | 316 | Summit | 41 08 07 N | 081 26 39 W |
| Gulf School (historical) | School | 196 | Adams | 38 51 33 N | 083 29 30 W |
| Gulick Cemetery | Cemetery | 231 | Pickaway | 39 43 39 N | 083 07 22 W |
| Gulicks Ford | Crossing | 223 | Pickaway | 39 43 47 N | 083 07 58 W |
| Gull Cemetery | Cemetery | 218 | Fulton | 41 33 21 N | 084 22 04 W |
| Gull Harbor | Harbor | 175 | Erie | 41 23 25 N | 082 33 16 W |
| Gum Corner School (historical) | School | 295 | Brown | 39 07 13 N | 083 54 52 W |
| Gum Grove School (historical) | School | 287 | Warren | 39 23 50 N | 084 01 39 W |
| Gum Hollow | Valley | | Adams | 38 40 33 N | 083 18 13 W |
| Gum Run | Stream | | Warren | 39 28 00 N | 084 01 56 W |
| Gum Stump Hollow | Valley | | Lawrence | 38 39 54 N | 082 30 39 W |
| Gunckel Elementary School | School | 187 | Lucas | 41 38 43 N | 083 33 14 W |
| Gunckel Park | Park | 187 | Lucas | 41 38 49 N | 083 33 12 W |
| Gunckels Town Plan Historic District | Park | 220 | Montgomery | 39 37 33 N | 084 22 11 W |
| Gund Arena | Building | 204 | Cuyahoga | 41 29 47 N | 081 41 21 W |
| Gund Commons | Building | 323 | Knox | 40 22 40 N | 082 23 45 W |
| Gund Hall | Building | 207 | Cuyahoga | 41 30 38 N | 081 36 30 W |
| Gund Hall | Building | 335 | Knox | 40 22 42 N | 082 23 54 W |
| Gundy Cemetery | Cemetery | 268 | Franklin | 39 52 58 N | 083 09 21 W |
| Gundy Knob | Summit | 369 | Ross | 39 14 24 N | 083 05 42 W |
| Gungeon Hollow Run | Stream | | Jefferson | 40 20 25 N | 080 44 20 W |
| Gunn Cemetery | Cemetery | 198 | Henry | 41 19 50 N | 084 09 06 W |
| Gunnerville | Populated Place | 317 | Greene | 39 35 01 N | 083 45 46 W |
| Gunning Playground | Park | 240 | Cuyahoga | 41 26 05 N | 081 48 50 W |
| Gunsett School (historical) | School | 240 | Van Wert | 40 53 18 N | 084 42 26 W |
| Gunther Elementary School | School | 302 | Summit | 41 01 30 N | 081 33 25 W |
| Gunyon Hollow | Valley | | Jefferson | 40 20 23 N | 080 44 25 W |
| Gurley (historical) | Populated Place | 280 | Marion | 40 35 10 N | 083 15 21 W |
| Gurley Post Office (historical) | Post Office | 280 | Marion | 40 35 10 N | 083 15 20 W |
| Gurney Hall | Building | 366 | Stark | 40 49 40 N | 081 22 40 W |
| Gurneyville | Populated Place | 322 | Clinton | 39 30 53 N | 083 52 37 W |
| Gurneyville Post Office (historical) | Post Office | 322 | Clinton | 39 30 55 N | 083 52 35 W |
| Guseman Cemetery | Cemetery | 281 | Fairfield | 39 42 50 N | 082 38 50 W |
| Gustavus | Populated Place | 327 | Trumbull | 41 27 43 N | 080 39 56 W |
| Gustavus Center Historic District | Park | 323 | Trumbull | 41 27 24 N | 080 39 56 W |
| Gustavus Elementary School | School | 327 | Trumbull | 41 27 41 N | 080 40 04 W |
| Gustavus Post Office | Post Office | 326 | Trumbull | 41 27 45 N | 080 39 54 W |
| Gustin Ditch | Canal | 313 | Miami | 40 08 38 N | 084 07 04 W |
| Gustwiller Ditch | Canal | 219 | Henry | 41 12 16 N | 084 06 14 W |
| Guthery Cemetery | Cemetery | 282 | Marion | 40 32 48 N | 083 20 58 W |
| Guthiel Ditch | Canal | 322 | Trumbull | 41 13 34 N | 080 42 34 W |
| Guthrie | Populated Place | 171 | Lawrence | 38 26 38 N | 082 20 18 W |
| Guthrie Creek | Stream | | Meigs | 39 11 00 N | 081 54 01 W |
| Guthrie School (historical) | School | 371 | Holmes | 40 38 58 N | 081 49 20 W |
| Gutman | Populated Place | 314 | Auglaize | 40 31 10 N | 084 02 38 W |
| Gutman Post Office (historical) | Post Office | 309 | Auglaize | 40 30 11 N | 084 02 38 W |
| Gutzwillers Grove Cemetery | Cemetery | 259 | Hamilton | 39 12 13 N | 084 35 15 W |
| Guy Cemetery | Cemetery | 311 | Madison | 40 03 55 N | 083 28 24 W |
| Guyan Run | Stream | | Meigs | 39 05 04 N | 081 48 18 W |
| Guyan Valley Church | Church | 188 | Lawrence | 38 33 31 N | 082 21 12 W |
| Guyandot Shoals | Bar | 157 | Lawrence | 38 26 16 N | 082 23 47 W |
| Guyst Fork | Stream | | Muskingum | 39 46 58 N | 081 47 29 W |
| Guysville | Populated Place | 196 | Athens | 39 17 24 N | 081 55 24 W |