Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Blumenstock School (historical) | School | 318 | Darke | 39 57 40 N | 084 31 23 W |
| Bolton Run | Stream | | Darke | 40 06 47 N | 084 31 34 W |
| Boyd Creek | Stream | | Darke | 40 11 09 N | 084 35 36 W |
| Boyer Ditch | Canal | 297 | Darke | 40 12 20 N | 084 30 37 W |
| Bradford Central Elementary School | School | 302 | Darke | 40 07 52 N | 084 25 57 W |
| Bradford Church of the Brethren | Church | 300 | Darke | 40 08 00 N | 084 25 54 W |
| Bradford Church of the Nazarene | Church | 298 | Darke | 40 08 08 N | 084 26 03 W |
| Braffetsville | Populated Place | 352 | Darke | 39 55 28 N | 084 45 42 W |
| Bridge Creek | Stream | | Darke | 40 05 52 N | 084 35 39 W |
| Brock | Populated Place | 318 | Darke | 40 15 59 N | 084 33 31 W |
| Brock Cemetery | Cemetery | 316 | Darke | 40 15 37 N | 084 33 38 W |
| Brock Cemetery | Cemetery | 322 | Darke | 40 16 07 N | 084 34 11 W |
| Brock Post Office (historical) | Post Office | 318 | Darke | 40 16 00 N | 084 33 30 W |
| Browns Ditch | Canal | 310 | Darke | 39 58 05 N | 084 27 17 W |
| Buckhorn Corner | Populated Place | 322 | Darke | 40 13 23 N | 084 46 31 W |
| Bucks Corner | Populated Place | 320 | Darke | 40 18 33 N | 084 46 31 W |
| Bunker Hill School (historical) | School | 330 | Darke | 40 20 17 N | 084 45 22 W |
| Burkettsville Elementary School | School | 299 | Darke | 40 21 05 N | 084 38 48 W |
| Butler Middle School | School | 332 | Darke | 39 57 35 N | 084 37 52 W |
| Castine | Populated Place | 328 | Darke | 39 55 54 N | 084 37 28 W |
| Castine Church of the Brethren | Church | 327 | Darke | 39 55 52 N | 084 37 20 W |
| Castine Post Office | Post Office | 329 | Darke | 39 55 55 N | 084 37 28 W |
| Castine United Methodist Church | Church | 329 | Darke | 39 55 58 N | 084 37 28 W |
| Cedar Grove Cemetery | Cemetery | 340 | Darke | 39 57 13 N | 084 47 17 W |
| Cedar Grove Church of the Brethren | Church | 338 | Darke | 39 57 15 N | 084 47 14 W |
| Chapel Cemetery | Cemetery | 357 | Darke | 40 01 56 N | 084 47 50 W |
| Childrens Home Cemetery | Cemetery | 315 | Darke | 40 08 10 N | 084 37 09 W |
| Christian Cemetery | Cemetery | 298 | Darke | 40 10 24 N | 084 27 28 W |
| Christian Missionary Alliance Church | Church | 318 | Darke | 40 05 56 N | 084 37 48 W |
| Church of the Nazarene | Church | 318 | Darke | 40 05 17 N | 084 37 54 W |
| Clark | Populated Place | 333 | Darke | 40 00 47 N | 084 43 27 W |
| Clark Cemetery | Cemetery | 337 | Darke | 40 00 53 N | 084 43 17 W |
| Clemens Cemetery | Cemetery | 356 | Darke | 40 04 53 N | 084 47 57 W |
| Coletown | Populated Place | 320 | Darke | 40 08 04 N | 084 42 10 W |
| Coletown Congregational Christian Church | Church | 322 | Darke | 40 08 03 N | 084 42 01 W |
| Community Church of Greenville | Church | 317 | Darke | 40 05 07 N | 084 37 52 W |
| Concord | Populated Place | 316 | Darke | 40 05 10 N | 084 34 43 W |
| Coppess Cemetery | Cemetery | 298 | Darke | 40 10 31 N | 084 32 51 W |
| Coppess Nature Sanctuary | Park | 316 | Darke | 40 12 59 N | 084 43 34 W |
| Cosmos | Populated Place | 313 | Darke | 40 16 02 N | 084 46 46 W |
| Cosmos Post Office (historical) | Post Office | 314 | Darke | 40 16 00 N | 084 46 45 W |
| Cosmos School (historical) | School | 314 | Darke | 40 16 01 N | 084 46 42 W |
| County Home Cemetery | Cemetery | 322 | Darke | 40 03 59 N | 084 37 07 W |
| Creekbaum Cemetery | Cemetery | 314 | Darke | 40 07 43 N | 084 41 37 W |
| Cromer Cemetery | Cemetery | 303 | Darke | 40 06 28 N | 084 29 42 W |
| Darke Company Lake Wildlife Area Pond | Reservoir | 304 | Darke | 40 07 12 N | 084 31 18 W |
| Darke Company Lake Wildlife Area Pond Five Dam | Dam | 304 | Darke | 40 07 12 N | 084 31 18 W |
| Darke County | Civil | 316 | Darke | 40 08 00 N | 084 37 00 W |
| Darke County Airport | Airport | 307 | Darke | 40 12 15 N | 084 31 48 W |
| Darke County Childrens Home | Building | 311 | Darke | 40 08 19 N | 084 36 58 W |
| Darke County Courthouse | Building | 319 | Darke | 40 06 02 N | 084 37 54 W |
| Darke County Fairgrounds | Locale | 318 | Darke | 40 05 11 N | 084 38 22 W |
| Darke County Home | Building | 321 | Darke | 40 03 48 N | 084 37 41 W |
| Darke County Jail | Building | 319 | Darke | 40 06 01 N | 084 37 53 W |
| Darke County Lake Wildlife Area | Park | 300 | Darke | 40 06 54 N | 084 31 39 W |
| Dawn | Populated Place | 310 | Darke | 40 13 01 N | 084 34 44 W |
| Dawn Post Office (historical) | Post Office | 310 | Darke | 40 13 00 N | 084 34 45 W |
| Delisle | Populated Place | 321 | Darke | 40 01 10 N | 084 34 27 W |
| Delisle Post Office (historical) | Post Office | 320 | Darke | 40 01 10 N | 084 34 25 W |
| Delvin (historical) | Populated Place | 302 | Darke | 40 19 30 N | 084 32 04 W |
| Delvin Post Office (historical) | Post Office | 302 | Darke | 40 19 30 N | 084 32 05 W |
| Dininger Cemetery | Cemetery | 330 | Darke | 40 05 31 N | 084 42 25 W |
| Dismal Creek | Stream | 320 | Darke | 40 09 18 N | 084 44 58 W |
| Dividing Branch | Stream | | Darke | 40 05 44 N | 084 33 45 W |
| Dobson School (historical) | School | 352 | Darke | 40 01 11 N | 084 47 50 W |
| Duvall Cemetery | Cemetery | 308 | Darke | 40 13 09 N | 084 40 42 W |
| Earhart Cemetery | Cemetery | 311 | Darke | 40 09 29 N | 084 38 15 W |
| East Elementary School | School | 318 | Darke | 40 06 05 N | 084 37 38 W |
| East Main Church of Christ | Church | 317 | Darke | 40 06 20 N | 084 37 43 W |
| East Zion Cemetery | Cemetery | 332 | Darke | 40 02 30 N | 084 41 02 W |
| East Zion Community Cemetery | Cemetery | 317 | Darke | 40 06 17 N | 084 34 30 W |
| East Zion Congregational Christian Church | Church | 313 | Darke | 40 06 18 N | 084 34 27 W |
| Eldora Speedway | Locale | 302 | Darke | 40 19 07 N | 084 38 01 W |
| Elm Hill School (historical) | School | 346 | Darke | 40 06 26 N | 084 47 24 W |
| Elroy | Populated Place | 315 | Darke | 40 12 23 N | 084 42 34 W |
| Elroy Post Office (historical) | Post Office | 315 | Darke | 40 12 25 N | 084 42 35 W |
| Elson Ditch | Canal | 338 | Darke | 40 07 52 N | 084 47 28 W |
| English Cemetery | Cemetery | 308 | Darke | 40 14 59 N | 084 27 36 W |
| Erisman Cemetery | Cemetery | 306 | Darke | 40 08 10 N | 084 32 28 W |
| Euclid Shopping Center | Locale | 330 | Darke | 40 02 09 N | 084 39 19 W |
| Evangelical United Methodist Church | Church | 318 | Darke | 40 05 54 N | 084 37 55 W |
| Evangelical United Methodist Church | Church | 335 | Darke | 40 12 03 N | 084 48 11 W |
| Fairview Cemetery | Cemetery | 317 | Darke | 40 19 42 N | 084 41 33 W |
| Faith United Methodist Church | Church | 319 | Darke | 39 59 26 N | 084 33 06 W |
| Feitshams Ditch | Canal | 311 | Darke | 39 57 56 N | 084 26 56 W |
| First Baptist Church | Church | 304 | Darke | 40 07 25 N | 084 25 56 W |
| First Church of Christ Scientist | Church | 318 | Darke | 40 06 02 N | 084 37 46 W |
| First Congregational Church | Church | 318 | Darke | 40 05 58 N | 084 37 52 W |
| First Presbyterian Church | Church | 303 | Darke | 40 07 50 N | 084 25 56 W |
| First Southern Baptist Church | Church | 302 | Darke | 40 13 16 N | 084 28 54 W |
| First United Church of Christ | Church | 318 | Darke | 40 05 57 N | 084 37 52 W |
| First United Methodist Church | Church | 320 | Darke | 40 06 00 N | 084 37 60 W |
| First United Presbyterian Church | Church | 318 | Darke | 40 06 05 N | 084 37 52 W |
| First Universalist Cemetery | Cemetery | 341 | Darke | 39 58 01 N | 084 42 22 W |
| First Universalist Church | Church | 340 | Darke | 39 57 59 N | 084 42 23 W |
| Flory School (historical) | School | 327 | Darke | 40 09 47 N | 084 45 14 W |
| Fort Jefferson | Populated Place | 330 | Darke | 40 01 35 N | 084 39 19 W |
| Fort Jefferson Post Office (historical) | Post Office | 330 | Darke | 40 01 35 N | 084 39 20 W |
| Fort Jefferson State Memorial | Park | 329 | Darke | 40 01 32 N | 084 39 23 W |
| Fort Jefferson Station (historical) | Locale | 316 | Darke | 40 01 34 N | 084 39 58 W |
| Fountain of Life Church | Church | 318 | Darke | 40 05 17 N | 084 37 54 W |
| Fourmans Corners | Populated Place | 313 | Darke | 40 01 12 N | 084 31 04 W |
| Fourth Street Church of God | Church | 318 | Darke | 40 06 09 N | 084 37 43 W |
| Foutz Cemetery | Cemetery | 332 | Darke | 39 59 41 N | 084 40 47 W |
| Franklin-Monroe Elementary School | School | 309 | Darke | 40 03 03 N | 084 28 10 W |
| Franklin-Monroe High School | School | 312 | Darke | 39 59 00 N | 084 28 52 W |
| Frantz School (historical) | School | 309 | Darke | 40 15 20 N | 084 29 04 W |
| Frenchtown | Populated Place | 313 | Darke | 40 14 47 N | 084 31 26 W |
| Frenchtown Cemetery | Cemetery | 313 | Darke | 40 14 45 N | 084 31 25 W |
| Friendship Cemetery | Cemetery | 349 | Darke | 39 56 43 N | 084 46 43 W |