Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Dora Barnes Residential Home | Hospital | 304 | Appanoose | 40 44 11 N | 092 52 37 W |
| Doran Cemetery | Cemetery | 225 | Muscatine | 41 33 30 N | 090 58 01 W |
| Doran Clinic for Women | Hospital | 284 | Story | 42 01 57 N | 093 36 42 W |
| Doran Post Office (historical) | Post Office | 382 | Mitchell | 43 21 28 N | 092 35 51 W |
| Dorchester | Populated Place | 225 | Allamakee | 43 28 11 N | 091 30 40 W |
| Dorchester Post Office | Post Office | 230 | Allamakee | 43 28 15 N | 091 30 31 W |
| Dordt College | School | 446 | Sioux | 43 04 56 N | 096 10 06 W |
| Dordt College Greenhouse | Building | 446 | Sioux | 43 04 55 N | 096 10 02 W |
| Dordt College Gymnasium | Building | 447 | Sioux | 43 05 01 N | 096 09 55 W |
| Dordt College Library | Building | 443 | Sioux | 43 04 58 N | 096 10 01 W |
| Doris | Populated Place | 309 | Buchanan | 42 28 49 N | 091 48 52 W |
| Dorman Memorial Gymnasium | Building | 315 | Fayette | 42 50 25 N | 091 47 56 W |
| Dorothy Pecaut Nature Center | Locale | 349 | Woodbury | 42 33 00 N | 096 28 01 W |
| Dorr Cemetery | Cemetery | 287 | Jackson | 42 14 54 N | 090 35 52 W |
| Dorrville Post Office (historical) | Post Office | 330 | Warren | 41 10 28 N | 093 46 06 W |
| Dott Park | Park | 324 | Wayne | 40 45 27 N | 093 18 38 W |
| Doty Park | Park | 375 | Crawford | 42 01 18 N | 095 21 30 W |
| Doubleday | Populated Place | 332 | Floyd | 43 05 11 N | 092 38 01 W |
| Doubleday (historical) | Locale | 332 | Floyd | 43 05 11 N | 092 38 01 W |
| Doud Cemetery | Cemetery | 213 | Marion | 41 14 28 N | 092 53 45 W |
| Douds | Populated Place | 184 | Van Buren | 40 50 22 N | 092 05 12 W |
| Douds (historical) | Locale | 184 | Van Buren | 40 50 22 N | 092 05 12 W |
| Douds Fire Department | Building | 184 | Van Buren | 40 50 22 N | 092 05 12 W |
| Douds Medical Clinic | Hospital | 184 | Van Buren | 40 50 22 N | 092 05 12 W |
| Douds Post Office | Post Office | 184 | Van Buren | 40 50 22 N | 092 05 12 W |
| Dougherty | Populated Place | 336 | Cerro Gordo | 42 55 20 N | 093 02 32 W |
| Dougherty (historical) | Locale | 336 | Cerro Gordo | 42 55 22 N | 093 02 26 W |
| Dougherty Post Office | Post Office | 336 | Cerro Gordo | 42 55 20 N | 093 02 32 W |
| Dougherty Town Hall | Building | 336 | Cerro Gordo | 42 55 20 N | 093 02 32 W |
| Douglas Avenue Presbyterian Church | Church | 289 | Polk | 41 37 47 N | 093 40 53 W |
| Douglas Center School | School | 340 | Madison | 41 22 02 N | 094 04 15 W |
| Douglas Centre Post Office (historical) | Post Office | 418 | Clay | 42 56 45 N | 095 09 43 W |
| Douglas Church | Church | 293 | Fayette | 43 00 28 N | 091 52 15 W |
| Douglas Creek | Stream | | Mills | 41 01 15 N | 095 26 50 W |
| Douglas Hall | Building | 227 | Linn | 41 59 16 N | 091 39 35 W |
| Douglas School | School | 301 | Boone | 41 54 53 N | 094 06 12 W |
| Douglas School | School | 267 | Polk | 41 37 48 N | 093 32 31 W |
| Douglas Townhall | Building | 420 | Clay | 42 57 14 N | 095 12 39 W |
| Douglas Township Cemetery | Cemetery | 427 | Audubon | 41 45 40 N | 095 01 43 W |
| Douglas Township Cemetery | Cemetery | 427 | Clay | 42 55 32 N | 095 14 43 W |
| Douglas Township Cemetery | Cemetery | 347 | Montgomery | 41 08 10 N | 094 58 31 W |
| Douglas Township Cemetery Area | Park | 420 | Ida | 42 31 55 N | 095 39 39 W |
| Douglass | Locale | 296 | Fayette | 43 00 30 N | 091 52 17 W |
| Douglass | Populated Place | 296 | Fayette | 43 00 30 N | 091 52 17 W |
| Douglass Cemetery | Cemetery | 304 | Lucas | 40 59 30 N | 093 17 41 W |
| Douglass Post Office (historical) | Post Office | 296 | Fayette | 43 00 30 N | 091 52 17 W |
| Douma Elementary School | School | 200 | Wapello | 40 59 44 N | 092 25 36 W |
| Douma Park | Park | 439 | O'Brien | 43 09 45 N | 095 42 21 W |
| Dousman Creek | Stream | | Allamakee | 43 05 23 N | 091 12 34 W |
| Douwstra Auditorium | Building | 267 | Marion | 41 24 02 N | 092 55 11 W |
| Dove Fellowship | Church | 222 | Henry | 41 08 03 N | 091 32 42 W |
| Dove Harbor | Harbor | 180 | Dubuque | 42 30 13 N | 090 39 15 W |
| Dove Ministries Church | Church | 211 | Wapello | 40 58 50 N | 092 25 43 W |
| Dove Post Office (historical) | Post Office | 241 | Iowa | 41 50 60 N | 092 17 31 W |
| Dover | Populated Place | 248 | Iowa | 41 50 53 N | 092 17 36 W |
| Dover (historical) | Populated Place | 225 | Davis | 40 43 52 N | 092 12 26 W |
| Dover Avenue Alliance Church | Church | 432 | Sioux | 43 00 31 N | 096 03 10 W |
| Dover Cemetery | Cemetery | 265 | Iowa | 41 50 30 N | 092 17 31 W |
| Dover Historical Museum | Building | 234 | Henry | 40 55 32 N | 091 24 19 W |
| Dover Mills | Populated Place | 263 | Fayette | 43 01 10 N | 091 43 46 W |
| Dover Mills Post Office (historical) | Post Office | 263 | Fayette | 43 01 10 N | 091 43 46 W |
| Dover Number Six Park | Park | 287 | Fayette | 43 02 15 N | 091 45 23 W |
| Dover Post Office (historical) | Post Office | 205 | Lee | 40 41 51 N | 091 33 54 W |
| Dover Township Cemetery | Cemetery | 299 | Fayette | 43 04 15 N | 091 50 22 W |
| Dow City | Locale | 342 | Crawford | 41 55 50 N | 095 29 51 W |
| Dow City | Populated Place | 348 | Crawford | 41 55 44 N | 095 29 38 W |
| Dow City Cemetery | Cemetery | 365 | Crawford | 41 55 19 N | 095 30 44 W |
| Dow City Library | Building | 347 | Crawford | 41 55 43 N | 095 29 44 W |
| Dow City Post Office | Post Office | 347 | Crawford | 41 55 45 N | 095 29 47 W |
| Dow House Historic Site | Locale | 349 | Crawford | 41 55 32 N | 095 29 51 W |
| Dowd Creek | Stream | | Hardin | 42 12 20 N | 093 01 56 W |
| Dowler Cemetery | Cemetery | 273 | Jasper | 41 33 30 N | 093 08 11 W |
| Dowling High School | School | 264 | Polk | 41 35 49 N | 093 43 23 W |
| Dowling High School | School | 269 | Polk | 41 36 30 N | 093 37 50 W |
| Downers Grove | Populated Place | 291 | Jones | 42 14 42 N | 091 16 52 W |
| Downersville Post Office (historical) | Post Office | 296 | Jones | 42 15 40 N | 091 17 06 W |
| Downey | Populated Place | 210 | Cedar | 41 36 58 N | 091 20 55 W |
| Downey (historical) | Locale | 210 | Cedar | 41 36 58 N | 091 20 55 W |
| Downey Cemetery | Cemetery | 224 | Cedar | 41 36 43 N | 091 19 07 W |
| Downey Memorial Park | Park | 250 | Warren | 41 20 25 N | 093 34 33 W |
| Downey Post Office (historical) | Post Office | 210 | Cedar | 41 36 58 N | 091 20 55 W |
| Downing County Park | Park | 308 | Fayette | 42 44 31 N | 092 02 36 W |
| Downsville Cemetery | Cemetery | 330 | Pottawattamie | 41 21 01 N | 095 42 15 W |
| Downsville Post Office (historical) | Post Office | 322 | Pottawattamie | 41 20 46 N | 095 42 33 W |
| Downsvillw (historical) | Locale | 361 | Pottawattamie | 41 25 43 N | 095 42 57 W |
| Dows | Locale | 351 | Wright | 42 39 27 N | 093 29 60 W |
| Dows | Populated Place | 351 | Wright | 42 39 24 N | 093 30 04 W |
| Dows Care Center | Hospital | 351 | Wright | 42 38 58 N | 093 30 11 W |
| Dows City Hall | Building | 351 | Wright | 42 39 24 N | 093 30 03 W |
| Dows Clinic - Franklin Medical Center | Hospital | 351 | Wright | 42 39 32 N | 093 30 02 W |
| Dows Community School | School | 358 | Wright | 42 39 32 N | 093 30 30 W |
| Dows Fine Arts Center | Building | 232 | Linn | 41 59 09 N | 091 39 28 W |
| Dows Fire Department | Building | 351 | Wright | 42 39 24 N | 093 30 03 W |
| Dows Golf Course | Locale | 369 | Franklin | 42 39 15 N | 093 29 01 W |
| Dows Park | Park | 357 | Wright | 42 40 27 N | 093 30 13 W |
| Dows Post Office | Post Office | 351 | Wright | 42 39 24 N | 093 30 03 W |
| Dows Public Library | Building | 351 | Wright | 42 39 24 N | 093 30 03 W |
| Dows Residence Hall | Building | 272 | Linn | 41 55 31 N | 091 25 32 W |
| Dows Welcome Center | Building | 351 | Wright | 42 39 34 N | 093 30 02 W |
| Doyle Cemetery | Cemetery | 462 | O'Brien | 43 03 42 N | 095 31 29 W |
| Doyle Cemetery | Cemetery | 424 | Shelby | 41 48 05 N | 095 30 31 W |
| Doze Cemetery | Cemetery | 322 | Decatur | 40 51 40 N | 093 38 31 W |
| Dragoon Trail Historical Marker | Park | 231 | Jefferson | 40 57 27 N | 092 03 05 W |
| Dragoon Trail Historical Marker | Park | 161 | Lee | 40 32 35 N | 091 25 31 W |
| Dragoon Trail Historical Marker | Park | 247 | Mahaska | 41 17 50 N | 092 39 56 W |
| Dragoon Trail Historical Marker | Park | 341 | Webster | 42 29 19 N | 094 11 57 W |
| Dragoon Trail in Boone County Historical Marker | Park | 338 | Boone | 42 03 34 N | 093 53 33 W |
| Dragoon Trail in Hamilton County Historical Marker | Park | 320 | Hamilton | 42 27 55 N | 093 49 10 W |
| Dragoon Trail in Palo Alto County Historical Marker | Park | 373 | Palo Alto | 43 06 53 N | 094 40 46 W |
| Drainage Ditch 10 | Canal | 363 | Calhoun | 42 20 40 N | 094 39 29 W |