Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| De Leon Post Office (historical) | Post Office | 398 | Cherokee | 42 38 00 N | 095 33 51 W |
| De Long Cemetery | Cemetery | 208 | Mahaska | 41 15 20 N | 092 44 46 W |
| De Sales Grade School | School | 384 | Winneshiek | 43 08 35 N | 091 45 30 W |
| De Soto | Locale | 275 | Dallas | 41 31 44 N | 094 00 24 W |
| De Soto | Populated Place | 287 | Dallas | 41 31 54 N | 094 00 35 W |
| De Soto Calvary Baptist Church | Church | 287 | Dallas | 41 31 54 N | 094 00 35 W |
| De Soto City Hall | Building | 279 | Dallas | 41 31 45 N | 094 00 26 W |
| De Soto Elevator | Locale | 268 | Dallas | 41 36 54 N | 094 00 49 W |
| De Soto Elevator Incorporated Elevator | Locale | 279 | Dallas | 41 31 45 N | 094 00 26 W |
| De Soto Intermediate School | School | 294 | Dallas | 41 32 10 N | 094 00 34 W |
| De Soto Lake | Lake | 300 | Harrison | 41 32 30 N | 096 00 06 W |
| De Soto Post Office | Post Office | 287 | Dallas | 41 31 54 N | 094 00 35 W |
| De Soto Public Library | Building | 279 | Dallas | 41 31 45 N | 094 00 26 W |
| De Soto United Methodist Church | Church | 287 | Dallas | 41 31 54 N | 094 00 35 W |
| De Valois Field | Park | 437 | Sioux | 42 59 55 N | 096 03 17 W |
| De Velder Honor House | Building | 267 | Marion | 41 24 12 N | 092 55 09 W |
| De Witt | Locale | 207 | Clinton | 41 48 53 N | 090 32 20 W |
| De Witt | Populated Place | 216 | Clinton | 41 49 24 N | 090 32 17 W |
| De Witt Community Hospital | Hospital | 213 | Clinton | 41 49 36 N | 090 32 50 W |
| De Witt Evangelical Free Church | Church | 228 | Clinton | 41 50 07 N | 090 32 23 W |
| De Witt Family Health Clinic | Hospital | 211 | Clinton | 41 49 34 N | 090 32 48 W |
| De Witt Fire Station | Building | 214 | Clinton | 41 49 30 N | 090 32 28 W |
| De Witt Lutheran Fellowship | Church | 230 | Clinton | 41 50 07 N | 090 32 22 W |
| De Witt Medical Center | Hospital | 213 | Clinton | 41 49 36 N | 090 32 50 W |
| De Witt Music Hall | Building | 438 | Sioux | 42 59 57 N | 096 03 26 W |
| De Witt Police Department | Building | 217 | Clinton | 41 49 27 N | 090 32 19 W |
| De Witt Post Office | Post Office | 218 | Clinton | 41 49 28 N | 090 32 16 W |
| De Wolf Park | Park | 415 | Clay | 43 07 35 N | 095 06 49 W |
| Dead Brier Creek | Stream | | Greene | 41 51 54 N | 094 17 49 W |
| Dead Lake | Lake | 184 | Clayton | 42 41 39 N | 090 59 23 W |
| Dead Lake | Lake | 179 | Jackson | 42 05 36 N | 090 10 46 W |
| Dead Man Creek | Stream | | Woodbury | 42 25 16 N | 096 19 00 W |
| Dead Man's Curve Cemetery | Cemetery | 323 | Ringgold | 40 45 25 N | 094 21 18 W |
| Dead Slough | Gut | 165 | Louisa | 41 05 50 N | 091 03 15 W |
| Deadmans Island | Island | 262 | Black Hawk | 42 33 23 N | 092 28 58 W |
| Deadmans Lake | Lake | 413 | Hancock | 43 14 58 N | 093 33 53 W |
| Deaf Missions Church | Church | 329 | Pottawattamie | 41 14 23 N | 095 47 06 W |
| Dean | Populated Place | 253 | Appanoose | 40 37 39 N | 092 42 51 W |
| Dean (historical) | Locale | 253 | Appanoose | 40 37 39 N | 092 42 51 W |
| Dean Lake | Lake | 238 | Polk | 41 35 15 N | 093 34 32 W |
| Dean Post Office (historical) | Post Office | 253 | Appanoose | 40 37 39 N | 092 42 51 W |
| Dearinger Cemetery | Cemetery | 246 | Jasper | 41 32 00 N | 092 55 06 W |
| Debra Heights Wesleyan Church | Church | 281 | Polk | 41 37 58 N | 093 40 39 W |
| Decatur Bend Park | Park | 318 | Monona | 42 00 29 N | 096 11 19 W |
| Decatur City | Populated Place | 347 | Decatur | 40 44 31 N | 093 50 02 W |
| Decatur City (historical) | Locale | 347 | Decatur | 40 44 31 N | 093 50 02 W |
| Decatur City Cemetery | Cemetery | 342 | Decatur | 40 44 37 N | 093 50 22 W |
| Decatur City Hall | Building | 347 | Decatur | 40 44 31 N | 093 50 02 W |
| Decatur County | Civil | 326 | Decatur | 40 45 02 N | 093 47 01 W |
| Decatur County Courthouse | Building | 342 | Decatur | 40 44 27 N | 093 44 47 W |
| Decatur County Fairground | Locale | 341 | Decatur | 40 45 13 N | 093 44 56 W |
| Decatur County Golf and Country Club | Locale | 345 | Decatur | 40 44 26 N | 093 45 41 W |
| Decatur County Home | Building | 340 | Decatur | 40 41 31 N | 093 42 05 W |
| Decatur County Hospital | Hospital | 345 | Decatur | 40 45 03 N | 093 44 51 W |
| Decatur County Hospital Heliport | Airport | 337 | Decatur | 40 45 02 N | 093 44 09 W |
| Decatur County Museum | Building | 341 | Decatur | 40 44 25 N | 093 44 47 W |
| Decatur County Sheriffs Office | Building | 342 | Decatur | 40 44 27 N | 093 44 47 W |
| Decatur Elementary School | School | 347 | Decatur | 40 44 31 N | 093 50 02 W |
| Decatur Medical Services Center | Hospital | 347 | Decatur | 40 45 05 N | 093 44 56 W |
| Decatur Medical Services Center | Hospital | 345 | Decatur | 40 37 11 N | 093 55 20 W |
| Decatur Post Office | Post Office | 347 | Decatur | 40 44 31 N | 093 50 02 W |
| Decatur Rest Area | Locale | 294 | Decatur | 40 39 20 N | 093 51 16 W |
| Decatur State Wildlife Area | Park | 316 | Decatur | 40 49 58 N | 093 51 06 W |
| Deception Hollow | Valley | | Webster | 42 19 40 N | 094 01 11 W |
| Deception Hollow Public Fishing Site | Park | 284 | Webster | 42 19 41 N | 094 01 18 W |
| Decorah | Populated Place | 268 | Winneshiek | 43 18 12 N | 091 47 09 W |
| Decorah (historical) | Locale | 267 | Winneshiek | 43 17 55 N | 091 47 14 W |
| Decorah Chiropractic Center | Hospital | 308 | Winneshiek | 43 17 25 N | 091 47 32 W |
| Decorah City Campground | Locale | 266 | Winneshiek | 43 17 58 N | 091 48 35 W |
| Decorah City Hall | Building | 262 | Winneshiek | 43 18 22 N | 091 47 23 W |
| Decorah Clinic | Hospital | 267 | Winneshiek | 43 17 41 N | 091 46 21 W |
| Decorah Covenant Church | Church | 286 | Winneshiek | 43 17 50 N | 091 46 54 W |
| Decorah Dental Associates Center | Hospital | 271 | Winneshiek | 43 17 44 N | 091 47 28 W |
| Decorah Lutheran Church | Church | 270 | Winneshiek | 43 18 08 N | 091 47 14 W |
| Decorah Middle School | School | 265 | Winneshiek | 43 18 00 N | 091 47 16 W |
| Decorah Municipal Airport | Airport | 350 | Winneshiek | 43 16 31 N | 091 44 22 W |
| Decorah Police Department | Building | 262 | Winneshiek | 43 18 21 N | 091 47 23 W |
| Decorah Post Office | Post Office | 262 | Winneshiek | 43 18 18 N | 091 47 24 W |
| Decorah Public Library | Building | 268 | Winneshiek | 43 18 11 N | 091 47 11 W |
| Dedham | Locale | 385 | Carroll | 41 54 59 N | 094 49 18 W |
| Dedham | Populated Place | 406 | Carroll | 41 54 22 N | 094 49 20 W |
| Dedham Cemetery | Cemetery | 417 | Carroll | 41 53 58 N | 094 49 22 W |
| Dedham City Hall | Building | 406 | Carroll | 41 54 22 N | 094 49 20 W |
| Dedham Co-op Association Elevator | Locale | 406 | Carroll | 41 54 22 N | 094 49 20 W |
| Dedham Creek | Stream | | Carroll | 41 54 40 N | 094 49 10 W |
| Dedham Fire Department | Building | 406 | Carroll | 41 54 22 N | 094 49 20 W |
| Dedham Post Office | Post Office | 406 | Carroll | 41 54 22 N | 094 49 20 W |
| Dedication to Peter Melendy Historical Marker | Park | 256 | Black Hawk | 42 32 20 N | 092 26 44 W |
| Dedication to Pioneers Historical Marker | Park | 427 | Buena Vista | 42 38 07 N | 095 11 13 W |
| Dedication to Zimri Streeter Historical Marker | Park | 266 | Black Hawk | 42 33 45 N | 092 26 44 W |
| Dedmore Cemetery | Cemetery | 249 | Iowa | 41 35 30 N | 092 10 01 W |
| Deeds Creek | Stream | | Lee | 40 47 07 N | 091 20 39 W |
| Deep Creek | Stream | | Fayette | 42 49 30 N | 091 35 07 W |
| Deep Creek | Stream | | Iowa | 41 37 51 N | 092 16 04 W |
| Deep Creek | Stream | | Jackson | 42 04 58 N | 090 25 53 W |
| Deep Creek | Stream | | Plymouth | 42 49 17 N | 096 07 17 W |
| Deep River | Populated Place | 278 | Poweshiek | 41 34 49 N | 092 22 30 W |
| Deep River | Stream | | Poweshiek | 41 35 47 N | 092 15 14 W |
| Deep River (historical) | Locale | 265 | Poweshiek | 41 34 55 N | 092 22 41 W |
| Deep River Cemetery | Cemetery | 275 | Poweshiek | 41 34 47 N | 092 21 59 W |
| Deep River Fire Station | Building | 276 | Poweshiek | 41 34 47 N | 092 22 27 W |
| Deep River Post Office | Post Office | 278 | Poweshiek | 41 34 49 N | 092 22 25 W |
| Deep River Timber Reserve | Park | 244 | Poweshiek | 41 35 35 N | 092 20 46 W |
| Deep River United Church | Church | 278 | Poweshiek | 41 34 50 N | 092 22 30 W |
| Deer Creek | Populated Place | 366 | Worth | 43 29 58 N | 093 07 37 W |
| Deer Creek | Stream | | Clayton | 42 59 02 N | 091 30 04 W |
| Deer Creek | Stream | | Clinton | 41 54 24 N | 090 10 41 W |
| Deer Creek | Stream | | Fremont | 40 52 45 N | 095 34 48 W |
| Deer Creek | Stream | | Guthrie | 41 33 23 N | 094 17 33 W |
| Deer Creek | Stream | | Johnson | 41 41 15 N | 091 37 01 W |