Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Swine Creek | Stream | | Trumbull | 41 28 37 N | 080 55 21 W |
| Swine Valley School (historical) | School | 332 | Highland | 39 06 06 N | 083 39 46 W |
| Swing Hall | Building | 276 | Butler | 39 30 41 N | 084 44 04 W |
| Swinging Bridge Lake | Reservoir | 252 | Montgomery | 39 41 10 N | 084 27 55 W |
| Swingle Cemetery | Cemetery | 244 | Muskingum | 39 48 43 N | 081 59 12 W |
| Swingley Farm Cemetery | Cemetery | 345 | Clinton | 39 20 49 N | 083 42 34 W |
| Swisher Cemetery | Cemetery | 329 | Licking | 40 00 51 N | 082 44 33 W |
| Swiss Church | Church | 353 | Holmes | 40 34 40 N | 081 42 26 W |
| Swiss Hall | Building | 207 | Cuyahoga | 41 28 17 N | 081 42 02 W |
| Swiss Village Shopping Center | Locale | 281 | Montgomery | 39 39 40 N | 084 09 33 W |
| Switzer | Populated Place | 379 | Monroe | 39 50 09 N | 080 53 20 W |
| Switzer Cemetery | Cemetery | 403 | Columbiana | 40 50 09 N | 080 45 16 W |
| Switzer Creek | Stream | | Richland | 40 38 18 N | 082 22 19 W |
| Switzer Post Office (historical) | Post Office | 378 | Monroe | 39 50 10 N | 080 53 19 W |
| Switzerland Lake | Reservoir | 349 | Belmont | 39 51 54 N | 081 03 59 W |
| Switzerland Lake Dam | Dam | 354 | Belmont | 39 51 54 N | 081 03 59 W |
| Switzerland School (historical) | School | 309 | Holmes | 40 34 42 N | 081 41 02 W |
| Swope Cemetery | Cemetery | 333 | Ashland | 40 56 43 N | 082 08 51 W |
| Sybene | Populated Place | 173 | Lawrence | 38 25 10 N | 082 30 14 W |
| Sybene Post Office (historical) | Post Office | 172 | Lawrence | 38 25 11 N | 082 30 15 W |
| Sycamore | Populated Place | 252 | Hamilton | 39 17 00 N | 084 19 01 W |
| Sycamore | Populated Place | 259 | Wyandot | 40 56 59 N | 083 10 15 W |
| Sycamore Branch Public Library | Building | 261 | Hamilton | 39 13 54 N | 084 22 46 W |
| Sycamore Church | Church | 302 | Clinton | 39 15 14 N | 083 55 20 W |
| Sycamore Conservation and Education Farm | Locale | 286 | Montgomery | 39 47 35 N | 084 21 07 W |
| Sycamore Creek | Stream | | Allen | 40 53 59 N | 084 05 14 W |
| Sycamore Creek | Stream | | Brown | 39 11 46 N | 083 56 45 W |
| Sycamore Creek | Stream | | Fairfield | 39 49 48 N | 082 45 09 W |
| Sycamore Creek | Stream | | Hamilton | 39 13 29 N | 084 19 09 W |
| Sycamore Creek | Stream | | Knox | 40 15 43 N | 082 27 26 W |
| Sycamore Creek | Stream | | Montgomery | 39 38 51 N | 084 17 14 W |
| Sycamore Creek | Stream | | Wyandot | 40 59 04 N | 083 12 09 W |
| Sycamore Creek Country Club | Locale | 259 | Warren | 39 33 53 N | 084 13 03 W |
| Sycamore Creek Park | Park | 250 | Fairfield | 39 52 52 N | 082 45 01 W |
| Sycamore Elementary School | School | 180 | Erie | 41 27 03 N | 082 41 53 W |
| Sycamore Elementary School | School | 258 | Wyandot | 40 56 57 N | 083 10 23 W |
| Sycamore Fork | Stream | | Washington | 39 31 51 N | 081 16 50 W |
| Sycamore Grove Picnic Area | Locale | 271 | Preble | 39 35 32 N | 084 45 10 W |
| Sycamore Hall | Building | 201 | Hamilton | 39 08 59 N | 084 28 45 W |
| Sycamore High School | School | 256 | Hamilton | 39 13 43 N | 084 22 06 W |
| Sycamore High School | School | 257 | Hamilton | 39 16 01 N | 084 21 08 W |
| Sycamore Hiking Trail | Trail | 266 | Preble | 39 35 22 N | 084 45 18 W |
| Sycamore Hills (subdivision) | Populated Place | 265 | Guernsey | 40 01 15 N | 081 37 17 W |
| Sycamore Hills Golf Course | Locale | 197 | Sandusky | 41 20 45 N | 083 11 20 W |
| Sycamore Hills Park | Park | 254 | Franklin | 40 04 19 N | 083 02 57 W |
| Sycamore Hollow | Valley | | Hocking | 39 31 15 N | 082 10 06 W |
| Sycamore Hollow | Valley | | Jackson | 39 11 19 N | 082 45 28 W |
| Sycamore Hollow | Valley | | Muskingum | 39 52 10 N | 081 55 18 W |
| Sycamore Hospital | Hospital | 281 | Montgomery | 39 38 14 N | 084 14 55 W |
| Sycamore Hospital Heliport | Airport | 267 | Montgomery | 39 30 15 N | 084 14 51 W |
| Sycamore Lake | Lake | 338 | Geauga | 41 31 39 N | 081 15 31 W |
| Sycamore Marina | Locale | 176 | Cuyahoga | 41 29 49 N | 081 42 31 W |
| Sycamore Park | Park | 224 | Clermont | 39 03 53 N | 084 11 28 W |
| Sycamore Reservable Area | Locale | 274 | Franklin | 40 04 17 N | 082 52 50 W |
| Sycamore Run | Stream | | Brown | 38 55 50 N | 083 48 47 W |
| Sycamore Run | Stream | | Muskingum | 39 52 15 N | 081 55 09 W |
| Sycamore School | School | 234 | Coshocton | 40 16 40 N | 081 51 55 W |
| Sycamore School (historical) | School | 282 | Hardin | 40 42 58 N | 083 30 51 W |
| Sycamore School (historical) | School | 193 | Jackson | 39 11 15 N | 082 44 42 W |
| Sycamore Shoals Marina | Locale | 140 | Hamilton | 39 07 44 N | 084 42 37 W |
| Sycamore Springs Golf Course | Locale | 257 | Hancock | 40 55 22 N | 083 39 45 W |
| Sycamore State Park | Park | 268 | Montgomery | 39 48 08 N | 084 20 40 W |
| Sycamore Trails Park | Park | 245 | Montgomery | 39 38 18 N | 084 15 42 W |
| Sycamore United Presbyterian Church | Church | 253 | Hamilton | 39 17 03 N | 084 18 57 W |
| Sycamore Valley | Populated Place | 244 | Monroe | 39 39 59 N | 081 14 36 W |
| Sycamore Valley Farm (historical) | Locale | 294 | Knox | 40 16 13 N | 082 27 30 W |
| Sycamore Valley Post Office | Post Office | 245 | Monroe | 39 40 00 N | 081 14 34 W |
| Sycamore Valley Trail | Trail | 251 | Athens | 39 20 12 N | 082 01 19 W |
| Sycamore West (subdivision) | Populated Place | 308 | Clark | 39 55 14 N | 083 54 26 W |
| Sydenstricker Church | Church | 168 | Lawrence | 38 30 47 N | 082 39 44 W |
| Sykes Cemetery | Cemetery | 383 | Monroe | 39 44 41 N | 080 52 41 W |
| Sykes Ridge | Ridge | 403 | Monroe | 39 44 33 N | 080 54 56 W |
| Sylvan Elementary School | School | 203 | Lucas | 41 42 10 N | 083 41 54 W |
| Sylvan Lake | Reservoir | 293 | Wayne | 40 47 25 N | 081 54 48 W |
| Sylvan Shores | Populated Place | 365 | Clark | 39 56 23 N | 083 35 28 W |
| Sylvania | Populated Place | 202 | Lucas | 41 43 08 N | 083 42 47 W |
| Sylvania Branch Library | Building | 198 | Lucas | 41 42 55 N | 083 42 25 W |
| Sylvania Burnham High School | School | 200 | Lucas | 41 42 58 N | 083 42 29 W |
| Sylvania Country Club | Locale | 196 | Lucas | 41 42 33 N | 083 40 49 W |
| Sylvania Country Squire Shopping Center | Locale | 197 | Lucas | 41 42 47 N | 083 41 02 W |
| Sylvania McCord Junior High School | School | 204 | Lucas | 41 41 41 N | 083 42 09 W |
| Sylvania Northview High School | School | 201 | Lucas | 41 42 46 N | 083 42 38 W |
| Sylvania Post Office | Post Office | 201 | Lucas | 41 43 07 N | 083 42 10 W |
| Sylvania Southview High School | School | 207 | Lucas | 41 41 15 N | 083 42 59 W |
| Sylvania Water Works | Locale | 203 | Lucas | 41 43 06 N | 083 42 31 W |
| Sylvester Hill | Summit | 374 | Pike | 39 11 13 N | 083 20 55 W |
| Sylvester Run | Stream | | Morrow | 40 29 07 N | 082 41 58 W |
| Sylvina Wilson Ditch | Canal | 297 | Madison | 39 53 43 N | 083 21 58 W |
| Symmes | Populated Place | 175 | Hamilton | 39 14 49 N | 084 17 47 W |
| Symmes Corner | Populated Place | 177 | Butler | 39 20 16 N | 084 34 11 W |
| Symmes Corners Post Office (historical) | Post Office | 177 | Butler | 39 20 15 N | 084 34 10 W |
| Symmes Creek | Stream | | Lawrence | 38 25 38 N | 082 26 58 W |
| Symmes Creek | Stream | | Muskingum | 40 04 25 N | 081 58 11 W |
| Symmes Creek Church | Church | 174 | Lawrence | 38 31 15 N | 082 27 36 W |
| Symmes Hall | Building | 267 | Butler | 39 30 43 N | 084 43 46 W |
| Symmes Park (subdivision) | Populated Place | 181 | Lawrence | 38 26 01 N | 082 27 19 W |
| Symmes Park Playground | Park | 179 | Butler | 39 23 46 N | 084 33 58 W |
| Symmes Post Office (historical) | Post Office | 281 | Hamilton | 39 04 50 N | 084 17 45 W |
| Symmes Square Shopping Center | Locale | 265 | Warren | 39 17 40 N | 084 18 44 W |
| Symmes Valley Church | Church | 177 | Lawrence | 38 37 18 N | 082 29 29 W |
| Symmes Valley High School | School | 186 | Lawrence | 38 36 26 N | 082 29 06 W |
| Synagogue Cemetery | Cemetery | 367 | Ashland | 40 44 51 N | 082 14 26 W |
| Syracuse | Populated Place | 180 | Meigs | 38 59 51 N | 081 58 26 W |
| Syracuse Elementary School | School | 178 | Meigs | 38 59 56 N | 081 58 35 W |
| Syracuse Hill Cemetery | Cemetery | 238 | Meigs | 39 00 03 N | 081 57 36 W |
| Syracuse Post Office | Post Office | 181 | Meigs | 38 59 50 N | 081 58 24 W |
| Syrian Shrine Oasis Lake Dam | Dam | 251 | Clermont | 39 14 24 N | 084 14 60 W |
| T C Knapp Elementary School | School | 339 | Stark | 40 46 14 N | 081 26 58 W |
| T W Stolport | Airport | 299 | Trumbull | 41 10 41 N | 080 33 47 W |
| Taber Lake | Reservoir | 364 | Belmont | 39 59 11 N | 081 09 14 W |