Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| School Number 10 (historical) | School | 256 | Defiance | 41 21 13 N | 084 47 09 W |
| School Number 2 (historical) | School | 218 | Defiance | 41 24 46 N | 084 31 02 W |
| School Number 2 (historical) | School | 243 | Defiance | 41 24 45 N | 084 37 53 W |
| School Number 3 (historical) | School | 222 | Defiance | 41 24 46 N | 084 33 21 W |
| School Number 3 (historical) | School | 249 | Defiance | 41 24 43 N | 084 40 08 W |
| School Number 4 (historical) | School | 219 | Defiance | 41 23 02 N | 084 33 20 W |
| School Number 4 (historical) | School | 243 | Defiance | 41 22 59 N | 084 40 13 W |
| School Number 5 (historical) | School | 217 | Defiance | 41 17 48 N | 084 30 56 W |
| School Number 5 (historical) | School | 239 | Defiance | 41 17 46 N | 084 47 11 W |
| School Number 6 (historical) | School | 229 | Defiance | 41 16 03 N | 084 47 11 W |
| School Number 6 (historical) | School | 224 | Defiance | 41 17 44 N | 084 42 29 W |
| School Number 6 (historical) | School | 222 | Defiance | 41 23 02 N | 084 35 33 W |
| School Number 8 (historical) | School | 219 | Defiance | 41 21 18 N | 084 30 57 W |
| School Number 8 (historical) | School | 221 | Defiance | 41 16 02 N | 084 42 28 W |
| School Number 9 (historical) | School | 219 | Defiance | 41 16 02 N | 084 40 11 W |
| School Number 9 (historical) | School | 250 | Defiance | 41 21 12 N | 084 44 50 W |
| School Number 9 (historical) | School | 222 | Defiance | 41 16 52 N | 084 43 15 W |
| Second Baptist Church | Church | 219 | Defiance | 41 16 57 N | 084 19 32 W |
| Second Ward Park | Park | 211 | Defiance | 41 16 59 N | 084 22 24 W |
| Seventh Day Adventist Church | Church | 230 | Defiance | 41 17 19 N | 084 45 54 W |
| Shady Corner School (historical) | School | 220 | Defiance | 41 16 55 N | 084 36 41 W |
| Sherwood | Populated Place | 217 | Defiance | 41 17 14 N | 084 33 13 W |
| Sherwood Cemetery | Cemetery | 216 | Defiance | 41 17 24 N | 084 33 03 W |
| Sherwood Elementary School | School | 217 | Defiance | 41 17 24 N | 084 33 11 W |
| Sherwood Post Office | Post Office | 216 | Defiance | 41 17 15 N | 084 33 15 W |
| Shoemaker Cemetery | Cemetery | 212 | Defiance | 41 16 32 N | 084 26 51 W |
| Shoestring School (historical) | School | 219 | Defiance | 41 18 12 N | 084 33 11 W |
| Six Corners | Populated Place | 234 | Defiance | 41 19 29 N | 084 42 35 W |
| Six Corners Cemetery | Cemetery | 234 | Defiance | 41 19 17 N | 084 42 55 W |
| Slocum Elementary School | School | 212 | Defiance | 41 16 57 N | 084 21 60 W |
| Snooks Run | Stream | | Defiance | 41 17 05 N | 084 30 32 W |
| South Fork Gordon Creek | Stream | | Defiance | 41 15 53 N | 084 39 55 W |
| South Powell Creek | Stream | | Defiance | 41 11 46 N | 084 19 60 W |
| Southerton | Populated Place | 218 | Defiance | 41 10 48 N | 084 18 40 W |
| Spencer Elementary School | School | 218 | Defiance | 41 17 31 N | 084 21 35 W |
| Spindler Cemetery | Cemetery | 220 | Defiance | 41 15 45 N | 084 40 11 W |
| Spion School (historical) | School | 220 | Defiance | 41 16 01 N | 084 37 53 W |
| Stevens Ditch | Canal | 211 | Defiance | 41 16 14 N | 084 25 42 W |
| Stevens Pond | Reservoir | 199 | Defiance | 41 17 24 N | 084 15 42 W |
| Stevens Pond Dam | Dam | 199 | Defiance | 41 17 24 N | 084 15 42 W |
| Sulphur Creek | Stream | | Defiance | 41 16 46 N | 084 32 04 W |
| Sun Rise Plaza Shopping Center | Locale | 218 | Defiance | 41 16 57 N | 084 20 01 W |
| Tamarack Cemetery | Cemetery | 259 | Defiance | 41 24 42 N | 084 42 32 W |
| Tamarack School (historical) | School | 259 | Defiance | 41 24 43 N | 084 42 26 W |
| Tanby Ditch | Canal | 215 | Defiance | 41 19 32 N | 084 21 26 W |
| Taylor Cemetery | Cemetery | 214 | Defiance | 41 13 51 N | 084 21 47 W |
| Tecumseh Park | Park | 210 | Defiance | 41 16 06 N | 084 22 56 W |
| Tenzer Hall | Building | 218 | Defiance | 41 17 49 N | 084 21 34 W |
| The Bend | Populated Place | 213 | Defiance | 41 17 02 N | 084 30 56 W |
| The Bend Post Office (historical) | Post Office | 215 | Defiance | 41 17 00 N | 084 30 55 W |
| The Church of Jesus Christ of Latter Day Saints | Church | 213 | Defiance | 41 16 32 N | 084 22 08 W |
| Threemile Creek | Stream | | Defiance | 41 15 05 N | 084 23 50 W |
| Tiffin Elementary School | School | 216 | Defiance | 41 23 10 N | 084 24 02 W |
| Tiffin River | Stream | | Defiance | 41 16 45 N | 084 23 04 W |
| Tinora Elementary School | School | 224 | Defiance | 41 21 21 N | 084 19 20 W |
| Tinora High School | School | 224 | Defiance | 41 21 23 N | 084 19 22 W |
| Tittle Cemetery | Cemetery | 224 | Defiance | 41 22 01 N | 084 17 09 W |
| Toledo Edison Power Dam | Dam | 202 | Defiance | 41 14 18 N | 084 23 60 W |
| Township High School | School | 221 | Defiance | 41 17 42 N | 084 37 49 W |
| Township High School | School | 217 | Defiance | 41 23 11 N | 084 24 02 W |
| Township of Adams | Civil | 224 | Defiance | 41 22 54 N | 084 17 08 W |
| Township of Defiance | Civil | 203 | Defiance | 41 16 09 N | 084 22 11 W |
| Township of Delaware | Civil | 216 | Defiance | 41 17 30 N | 084 31 39 W |
| Township of Farmer | Civil | 227 | Defiance | 41 22 50 N | 084 37 49 W |
| Township of Hicksville | Civil | 230 | Defiance | 41 17 38 N | 084 45 15 W |
| Township of Highland | Civil | 218 | Defiance | 41 12 41 N | 084 17 21 W |
| Township of Mark | Civil | 221 | Defiance | 41 17 44 N | 084 36 54 W |
| Township of Milford | Civil | 263 | Defiance | 41 22 41 N | 084 44 40 W |
| Township of Noble | Civil | 214 | Defiance | 41 18 03 N | 084 22 48 W |
| Township of Richland | Civil | 221 | Defiance | 41 17 02 N | 084 17 43 W |
| Township of Tiffin | Civil | 217 | Defiance | 41 22 53 N | 084 24 27 W |
| Township of Washington | Civil | 216 | Defiance | 41 22 55 N | 084 30 09 W |
| Trinity Cemetery | Cemetery | 218 | Defiance | 41 24 06 N | 084 32 07 W |
| Trinity United Methodist Church | Church | 209 | Defiance | 41 17 00 N | 084 21 12 W |
| United Brethren Church of Six Corners (historical) | Church | 234 | Defiance | 41 19 30 N | 084 42 33 W |
| United Methodist Church of Evansport | Church | 213 | Defiance | 41 25 27 N | 084 23 53 W |
| Wagner Run | Stream | | Defiance | 41 13 01 N | 084 20 47 W |
| WDFM-FM (Defiance) | Tower | 216 | Defiance | 41 17 28 N | 084 32 17 W |
| Webb Run | Stream | | Defiance | 41 18 50 N | 084 23 36 W |
| West Milford Church | Church | 255 | Defiance | 41 22 12 N | 084 47 12 W |
| West Milford School (historical) | School | 256 | Defiance | 41 22 56 N | 084 47 11 W |
| Whitney Hall | Building | 217 | Defiance | 41 17 47 N | 084 21 18 W |
| Williamstown | Populated Place | 217 | Defiance | 41 17 30 N | 084 21 40 W |
| Willow Run | Stream | | Defiance | 41 22 26 N | 084 48 10 W |
| Wilseyville (historical) | Populated Place | 230 | Defiance | 41 21 00 N | 084 40 16 W |
| Wilseyville Post Office (historical) | Post Office | 230 | Defiance | 41 21 00 N | 084 40 15 W |
| Wonderly School (historical) | School | 223 | Defiance | 41 19 31 N | 084 40 13 W |
| WONW-AM (Defiance) | Tower | 213 | Defiance | 41 16 44 N | 084 23 50 W |
| WZOM-FM (Defiance) | Tower | 216 | Defiance | 41 13 23 N | 084 22 36 W |
| Zion Lutheran Cemetery | Cemetery | 265 | Defiance | 41 25 34 N | 084 42 36 W |
| Zion Lutheran Church | Church | 218 | Defiance | 41 16 55 N | 084 19 59 W |
| Advent Church | Church | 350 | Delaware | 40 19 15 N | 082 45 60 W |
| Africa | Populated Place | 264 | Delaware | 40 10 56 N | 082 57 26 W |
| Africa Cemetery | Cemetery | 262 | Delaware | 40 11 41 N | 082 57 28 W |
| Africa Post Office (historical) | Post Office | 263 | Delaware | 40 10 55 N | 082 57 25 W |
| Alum Creek | Populated Place | 287 | Delaware | 40 16 02 N | 082 56 40 W |
| Alum Creek Lake | Reservoir | 254 | Delaware | 40 10 36 N | 082 57 24 W |
| Alum Creek Lake Dam | Dam | 254 | Delaware | 40 10 36 N | 082 57 24 W |
| Alum Creek Post Office (historical) | Post Office | 288 | Delaware | 40 16 00 N | 082 56 40 W |
| Alum Creek School (historical) | School | 289 | Delaware | 40 15 59 N | 082 56 24 W |
| Alum Creek State Park | Park | 274 | Delaware | 40 11 30 N | 082 58 23 W |
| Asbury United Methodist Church | Church | 275 | Delaware | 40 18 19 N | 083 04 11 W |
| Ashley | Populated Place | 300 | Delaware | 40 24 32 N | 082 57 20 W |
| Ashley Post Office | Post Office | 300 | Delaware | 40 24 30 N | 082 57 20 W |
| Ashley Union Cemetery | Cemetery | 297 | Delaware | 40 24 40 N | 082 56 37 W |
| Ashley United Methodist Church | Church | 299 | Delaware | 40 24 33 N | 082 57 10 W |
| August Acres Airport | Airport | 334 | Delaware | 40 09 45 N | 082 46 55 W |
| Austin Hall | Building | 282 | Delaware | 40 18 06 N | 083 04 38 W |
| Bald Lick | Stream | | Delaware | 40 18 47 N | 082 56 58 W |
| Bartholomew Run | Stream | | Delaware | 40 08 58 N | 083 02 36 W |