Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Williams Creek | Stream | | Belmont | 40 00 47 N | 080 50 51 W |
| Williams Creek | Stream | | Gallia | 38 36 10 N | 082 18 48 W |
| Williams Ditch | Canal | 174 | Lucas | 41 40 03 N | 083 17 34 W |
| Williams Ditch | Canal | 187 | Lucas | 41 38 36 N | 083 36 36 W |
| Williams Fork | Stream | | Muskingum | 39 54 14 N | 081 49 40 W |
| Williams Hall | Building | 274 | Butler | 39 30 23 N | 084 44 13 W |
| Williams Hall | Building | 320 | Greene | 39 44 51 N | 083 48 38 W |
| Williams Hall | Building | 346 | Portage | 41 08 45 N | 081 20 35 W |
| Williams Hall | Building | 211 | Wood | 41 22 35 N | 083 38 28 W |
| Williams Lake | Lake | 267 | Miami | 40 04 49 N | 084 20 55 W |
| Williams Lake | Reservoir | 261 | Delaware | 40 12 01 N | 082 58 08 W |
| Williams Prairie | Area | 260 | Miami | 40 02 57 N | 084 21 40 W |
| Williams Ridge | Ridge | 327 | Washington | 39 32 48 N | 081 08 55 W |
| Williams Run | Stream | | Meigs | 39 03 28 N | 082 18 28 W |
| Williams School | School | 319 | Cuyahoga | 41 26 52 N | 081 32 57 W |
| Williams School (historical) | School | 232 | Coshocton | 40 11 25 N | 081 44 14 W |
| Williams School (historical) | School | 280 | Delaware | 40 23 14 N | 083 12 48 W |
| Williams School (historical) | School | 214 | Meigs | 39 03 28 N | 082 18 01 W |
| Williams Stadium | Park | 314 | Clinton | 39 26 24 N | 083 49 07 W |
| Williams Temple | Church | 180 | Erie | 41 26 17 N | 082 43 18 W |
| Williams Temple Pentecostal Church | Church | 260 | Franklin | 40 00 39 N | 082 58 53 W |
| Williamsburg | Populated Place | 248 | Clermont | 39 03 15 N | 084 03 11 W |
| Williamsburg Branch Clermont County Public Library | Building | 267 | Clermont | 39 03 23 N | 084 03 26 W |
| Williamsburg Cemetery | Cemetery | 261 | Clermont | 39 03 40 N | 084 03 28 W |
| Williamsburg Church of Christ | Church | 269 | Clermont | 39 03 34 N | 084 03 44 W |
| Williamsburg Elementary School | School | 268 | Clermont | 39 03 22 N | 084 03 47 W |
| Williamsburg High School | School | 268 | Clermont | 39 03 20 N | 084 03 27 W |
| Williamsburg Lake | Reservoir | 196 | Wood | 41 26 42 N | 083 46 48 W |
| Williamsburg Lake - West Dam | Dam | 196 | Wood | 41 26 42 N | 083 46 48 W |
| Williamsburg Post Office | Post Office | 247 | Clermont | 39 03 15 N | 084 03 10 W |
| Williamsburg Presbyterian Church | Church | 265 | Clermont | 39 02 17 N | 084 03 03 W |
| Williamsburg United Methodist Church | Church | 250 | Clermont | 39 03 22 N | 084 03 08 W |
| Williamsburg-On-The-River | Populated Place | 201 | Wood | 41 26 33 N | 083 46 55 W |
| Williamsdale | Populated Place | 184 | Butler | 39 26 28 N | 084 31 48 W |
| Williamsdale Church of the Nazarene | Church | 183 | Butler | 39 26 29 N | 084 31 53 W |
| Williamsfield | Populated Place | 346 | Ashtabula | 41 32 00 N | 080 34 14 W |
| Williamsfield Cemetery | Cemetery | 326 | Ashtabula | 41 32 20 N | 080 36 34 W |
| Williamsfield Post Office | Post Office | 346 | Ashtabula | 41 32 00 N | 080 34 14 W |
| Williamsfield United Methodist Church | Church | 345 | Ashtabula | 41 31 57 N | 080 34 11 W |
| Williamson Airport | Airport | 323 | Greene | 39 42 45 N | 083 48 14 W |
| Williamson Alumni Center | Building | 351 | Portage | 41 09 12 N | 081 20 32 W |
| Williamson Cemetery | Cemetery | 298 | Marion | 40 35 20 N | 082 59 42 W |
| Williamson Cemetery | Cemetery | 293 | Noble | 39 37 35 N | 081 33 10 W |
| Williamson Cemetery | Cemetery | 192 | Scioto | 38 46 38 N | 083 01 16 W |
| Williamson Church | Church | 303 | Noble | 39 37 19 N | 081 32 47 W |
| Williamson Elementary School | School | 308 | Mahoning | 41 05 13 N | 080 39 17 W |
| Williamson Hall | Building | 273 | Mahoning | 41 06 14 N | 080 38 51 W |
| Williamson Hollow | Valley | | Adams | 38 41 51 N | 083 36 29 W |
| Williamson Hollow | Valley | | Scioto | 38 43 57 N | 083 11 05 W |
| Williamson Landing | Locale | 174 | Meigs | 38 55 35 N | 081 45 42 W |
| Williamson Mound State Memorial | Park | 308 | Greene | 39 44 22 N | 083 49 23 W |
| Williamson Run | Stream | | Jefferson | 40 11 29 N | 080 41 27 W |
| Williamsport | Populated Place | 257 | Columbiana | 40 43 26 N | 080 38 09 W |
| Williamsport | Populated Place | 418 | Morrow | 40 34 46 N | 082 43 48 W |
| Williamsport | Populated Place | 231 | Pickaway | 39 35 09 N | 083 07 14 W |
| Williamsport | Populated Place | 319 | Stark | 40 56 04 N | 081 05 41 W |
| Williamsport Cemetery | Cemetery | 321 | Stark | 40 55 57 N | 081 05 51 W |
| Williamsport Church | Church | 292 | Columbiana | 40 43 36 N | 080 37 54 W |
| Williamsport Church of Christ in Christian Union | Church | 232 | Pickaway | 39 35 00 N | 083 07 15 W |
| Williamsport Plaza Shopping Center | Locale | 239 | Cuyahoga | 41 22 23 N | 081 52 03 W |
| Williamsport Post Office | Post Office | 223 | Pickaway | 39 35 10 N | 083 07 15 W |
| Williamsport United Methodist Church | Church | 418 | Morrow | 40 34 39 N | 082 43 57 W |
| Williamsport United Methodist Church | Church | 235 | Pickaway | 39 35 13 N | 083 07 07 W |
| Williamston | Populated Place | 281 | Mahoning | 41 06 36 N | 080 40 54 W |
| Williamstown | Populated Place | 217 | Defiance | 41 17 30 N | 084 21 40 W |
| Williamstown | Populated Place | 285 | Hancock | 40 50 02 N | 083 39 03 W |
| Williamstown Cemetery | Cemetery | 283 | Hancock | 40 50 08 N | 083 39 03 W |
| Williamstown First Brethren Church | Church | 288 | Hancock | 40 49 50 N | 083 39 04 W |
| Williamstown Post Office | Post Office | 286 | Hancock | 40 50 00 N | 083 39 05 W |
| Williamsville Cemetery | Cemetery | 287 | Delaware | 40 10 14 N | 083 01 09 W |
| Williard Residence Hall (historical) | Building | 232 | Seneca | 41 06 53 N | 083 09 56 W |
| Williard Run | Stream | | Columbiana | 40 42 06 N | 080 51 59 W |
| Willig Park | Park | 323 | Stark | 40 49 45 N | 081 20 44 W |
| Willing Spirit Baptist Church | Church | 263 | Hamilton | 39 08 48 N | 084 34 15 W |
| Willing Workers Baptist Church | Church | 201 | Cuyahoga | 41 30 28 N | 081 38 41 W |
| Willing Workers Baptist Church | Church | 235 | Hamilton | 39 08 15 N | 084 28 18 W |
| Willis C Adams Middle School | School | 352 | Licking | 40 09 16 N | 082 41 18 W |
| Willis Cemetery | Cemetery | 227 | Lawrence | 38 30 42 N | 082 29 36 W |
| Willis Day Industrial Park | Park | 190 | Wood | 41 34 56 N | 083 32 57 W |
| Willis Elementary School | School | 382 | Carroll | 40 37 07 N | 080 55 33 W |
| Willis High School | School | 268 | Delaware | 40 17 57 N | 083 04 16 W |
| Willis Hill | Summit | 323 | Morgan | 39 39 13 N | 081 49 26 W |
| Willis Park | Park | 230 | Franklin | 39 57 08 N | 082 56 40 W |
| Willis Park | Park | 239 | Franklin | 39 57 00 N | 082 51 51 W |
| Willis Picnic Area | Locale | 283 | Cuyahoga | 41 23 13 N | 081 32 14 W |
| Willis Run | Stream | | Harrison | 40 22 21 N | 081 12 44 W |
| Willis Run Bay | Bay | 266 | Harrison | 40 21 56 N | 081 12 58 W |
| Willison Corners | Locale | 345 | Licking | 40 12 26 N | 082 44 24 W |
| Willison Run | Stream | | Monroe | 39 42 47 N | 081 08 23 W |
| Williston | Populated Place | 182 | Ottawa | 41 36 13 N | 083 20 24 W |
| Williston Cemetery | Cemetery | 179 | Ottawa | 41 36 36 N | 083 20 23 W |
| Williston Post Office | Post Office | 174 | Ottawa | 41 36 15 N | 082 20 25 W |
| Willo Plaza Shopping Center | Locale | 209 | Lake | 41 37 32 N | 081 25 41 W |
| Willo-Hill Baptist Church | Church | 234 | Lake | 41 38 20 N | 081 22 17 W |
| Willo-Lake Church of the Nazarene | Church | 189 | Lake | 41 39 47 N | 081 26 20 W |
| Willoughbeach | Populated Place | 187 | Lake | 41 38 20 N | 081 28 31 W |
| Willoughby | Populated Place | 201 | Lake | 41 38 23 N | 081 24 23 W |
| Willoughby Baptist Church | Church | 207 | Lake | 41 38 07 N | 081 24 37 W |
| Willoughby Church of God | Church | 207 | Lake | 41 38 13 N | 081 24 32 W |
| Willoughby City Hall | Building | 198 | Lake | 41 38 31 N | 081 24 28 W |
| Willoughby Commons Shopping Center | Locale | 204 | Lake | 41 37 42 N | 081 25 34 W |
| Willoughby Hills | Populated Place | 245 | Lake | 41 35 54 N | 081 25 06 W |
| Willoughby Hills City Hall | Building | 253 | Lake | 41 35 18 N | 081 26 15 W |
| Willoughby Hills United Methodist Church | Church | 257 | Lake | 41 35 23 N | 081 26 35 W |
| Willoughby Industrial Park | Locale | 196 | Lake | 41 38 02 N | 081 25 17 W |
| Willoughby Junior High School | School | 222 | Lake | 41 37 20 N | 081 25 22 W |
| Willoughby Municipal Park | Park | 187 | Lake | 41 42 01 N | 081 23 42 W |
| Willoughby Post Office | Post Office | 198 | Lake | 41 38 31 N | 081 24 30 W |
| Willoughby Post Office | Post Office | 201 | Lake | 41 38 25 N | 081 24 24 W |
| Willoughby Public Library | Building | 203 | Lake | 41 38 20 N | 081 24 27 W |