Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Deer Creek | Stream | | Jones | 42 15 38 N | 091 12 14 W |
| Deer Creek | Stream | | Madison | 41 12 21 N | 093 57 31 W |
| Deer Creek | Stream | | Mitchell | 43 22 52 N | 092 56 24 W |
| Deer Creek | Stream | | Plymouth | 42 41 28 N | 096 29 22 W |
| Deer Creek | Stream | | Plymouth | 42 36 50 N | 095 57 10 W |
| Deer Creek | Stream | | Polk | 41 44 09 N | 093 34 21 W |
| Deer Creek | Stream | | Tama | 41 57 20 N | 092 35 06 W |
| Deer Creek | Stream | | Washington | 41 29 14 N | 091 45 58 W |
| Deer Creek | Stream | | Webster | 42 29 45 N | 094 11 26 W |
| Deer Creek | Stream | | Webster | 42 36 01 N | 094 13 31 W |
| Deer Creek | Stream | | Winneshiek | 43 28 15 N | 092 00 16 W |
| Deer Creek | Stream | | Woodbury | 42 24 44 N | 096 12 05 W |
| Deer Creek Area | Park | 322 | Webster | 42 36 05 N | 094 13 26 W |
| Deer Creek Cemetery | Cemetery | 360 | Mitchell | 43 25 47 N | 093 01 26 W |
| Deer Creek Chapel | Church | 346 | Madison | 41 12 02 N | 093 59 60 W |
| Deer Creek Church | Church | 360 | Mitchell | 43 25 46 N | 093 01 26 W |
| Deer Creek Family Care Center | Hospital | 259 | Tama | 41 58 33 N | 092 35 13 W |
| Deer Creek Forest | Forest | 359 | Worth | 43 25 50 N | 093 02 46 W |
| Deer Creek Post Office (historical) | Post Office | 302 | Fremont | 40 51 57 N | 095 33 17 W |
| Deer Creek Rest Area | Locale | 357 | Worth | 43 25 35 N | 093 02 51 W |
| Deer Creek Township Hall | Building | 348 | Webster | 42 34 22 N | 094 15 22 W |
| Deer Creek Wildlife Area | Park | 361 | Worth | 43 26 60 N | 093 04 01 W |
| Deer Creek Wildlife Management Area | Park | 397 | Plymouth | 42 43 40 N | 096 30 31 W |
| Deer Island State Game Management Area | Park | 314 | Harrison | 41 49 23 N | 096 05 59 W |
| Deer Meadow Wildlife Area | Park | 301 | Franklin | 42 45 27 N | 093 01 46 W |
| Deer Run Golf Club | Locale | 289 | Warren | 41 21 00 N | 093 35 31 W |
| Deer Run Golf Course | Locale | 364 | Plymouth | 42 37 14 N | 096 17 56 W |
| Deercreek Post Office (historical) | Post Office | 366 | Worth | 43 29 58 N | 093 07 37 W |
| Deerfield | Populated Place | 348 | Chickasaw | 43 09 49 N | 092 29 44 W |
| Deerfield Cemetery | Cemetery | 348 | Chickasaw | 43 09 47 N | 092 29 45 W |
| Deerfield Post Office (historical) | Post Office | 348 | Chickasaw | 43 09 49 N | 092 29 44 W |
| Deerfield Wildlife Area | Park | 339 | Chickasaw | 43 07 35 N | 092 30 31 W |
| Deering Post Office (historical) | Post Office | 381 | Winnebago | 43 24 30 N | 093 43 31 W |
| Deerwood Golf Club | Locale | 230 | Henry | 40 53 30 N | 091 25 06 W |
| Deerwood Lake | Reservoir | 254 | Black Hawk | 42 27 30 N | 092 18 21 W |
| Deerwood Park | Park | 254 | Black Hawk | 42 27 31 N | 092 18 21 W |
| Deerwood Park Campground | Locale | 254 | Black Hawk | 42 27 31 N | 092 18 21 W |
| Deeter Cemetery | Cemetery | 296 | Jasper | 41 51 46 N | 093 15 06 W |
| Defiance | Locale | 386 | Shelby | 41 49 30 N | 095 20 19 W |
| Defiance | Populated Place | 390 | Shelby | 41 49 27 N | 095 20 34 W |
| Defiance City Hall | Building | 387 | Shelby | 41 49 27 N | 095 20 25 W |
| Defiance Fire Station | Building | 387 | Shelby | 41 49 27 N | 095 20 25 W |
| Defiance Post Office | Post Office | 388 | Shelby | 41 49 25 N | 095 20 26 W |
| Deistelmeier Complex | Park | 260 | Black Hawk | 42 29 45 N | 092 18 26 W |
| Dekalb Post Office (historical) | Post Office | 296 | Decatur | 40 50 23 N | 093 51 12 W |
| Del Norte Post Office (historical) | Post Office | 270 | Davis | 40 36 00 N | 092 23 41 W |
| Delano Post Office (historical) | Post Office | 387 | Winnebago | 43 21 10 N | 093 31 01 W |
| Delanti Post Office (historical) | Post Office | 288 | Hardin | 42 18 40 N | 093 04 19 W |
| Delaware | Locale | 326 | Delaware | 42 28 38 N | 091 20 40 W |
| Delaware | Populated Place | 329 | Delaware | 42 28 31 N | 091 20 44 W |
| Delaware County | Civil | 320 | Delaware | 42 28 00 N | 091 22 01 W |
| Delaware County Courthouse | Building | 287 | Delaware | 42 28 60 N | 091 27 18 W |
| Delaware County Fairgrounds | Locale | 289 | Delaware | 42 29 48 N | 091 27 11 W |
| Delaware County Historical Museum | Locale | 261 | Delaware | 42 20 15 N | 091 14 31 W |
| Delaware County Home | Building | 316 | Delaware | 42 26 03 N | 091 21 30 W |
| Delaware County Sheriffs Office | Building | 287 | Delaware | 42 28 60 N | 091 27 18 W |
| Delaware Elementary School | School | 286 | Polk | 41 38 22 N | 093 31 18 W |
| Delaware Family Medicine | Hospital | 289 | Polk | 41 42 52 N | 093 34 49 W |
| Delaware Post Office | Post Office | 329 | Delaware | 42 28 31 N | 091 20 44 W |
| Delaware Post Office (historical) | Post Office | 289 | Polk | 41 41 15 N | 093 32 30 W |
| DeLeon (historical) | Locale | 427 | Cherokee | 42 38 50 N | 095 32 25 W |
| Delhi | Populated Place | 314 | Delaware | 42 25 47 N | 091 19 52 W |
| Delhi (historical) | Locale | 306 | Delaware | 42 25 28 N | 091 19 59 W |
| Delhi Elementary Junior High School | School | 318 | Delaware | 42 25 35 N | 091 19 49 W |
| Delhi Fire Department | Building | 314 | Delaware | 42 25 47 N | 091 19 52 W |
| Delhi Post Office | Post Office | 314 | Delaware | 42 25 47 N | 091 19 52 W |
| Delhi Public Library | Building | 314 | Delaware | 42 25 48 N | 091 19 56 W |
| Delhi Silver Lake County Park | Park | 314 | Delaware | 42 25 31 N | 091 19 30 W |
| Delhi United Methodist Church | Church | 314 | Delaware | 42 25 44 N | 091 19 55 W |
| Deliverance Temple Church of God | Church | 259 | Black Hawk | 42 30 25 N | 092 20 19 W |
| Deliverance Temple Pentecostal Church | Church | 184 | Lee | 40 23 49 N | 091 22 48 W |
| Delmar | Populated Place | 250 | Clinton | 42 00 08 N | 090 36 25 W |
| Delmar Depot Museum | Building | 250 | Clinton | 42 00 08 N | 090 36 25 W |
| Delmar Junction (historical) | Locale | 250 | Clinton | 42 00 03 N | 090 36 24 W |
| Delmar Post Office | Post Office | 250 | Clinton | 42 00 08 N | 090 36 25 W |
| Deloit | Locale | 363 | Crawford | 42 05 50 N | 095 18 51 W |
| Deloit | Populated Place | 386 | Crawford | 42 05 52 N | 095 19 21 W |
| Deloit Post Office | Post Office | 386 | Crawford | 42 05 52 N | 095 19 21 W |
| DeLongs Creek | Stream | | Wright | 42 37 04 N | 093 30 18 W |
| Delphey Island | Island | 188 | Allamakee | 43 11 35 N | 091 09 09 W |
| Delphos | Populated Place | 347 | Ringgold | 40 39 49 N | 094 20 22 W |
| Delphos (historical) | Locale | 346 | Ringgold | 40 39 49 N | 094 20 31 W |
| Delphos Post Office | Post Office | 346 | Ringgold | 40 39 47 N | 094 20 21 W |
| Delta | Populated Place | 245 | Keokuk | 41 19 22 N | 092 19 49 W |
| Delta (historical) | Locale | 242 | Keokuk | 41 19 20 N | 092 19 41 W |
| Delta Christian Church | Church | 245 | Keokuk | 41 19 22 N | 092 19 49 W |
| Delta City Hall | Building | 245 | Keokuk | 41 19 22 N | 092 19 49 W |
| Delta Covered Bridge | Bridge | 207 | Keokuk | 41 17 56 N | 092 19 23 W |
| Delta Post Office | Post Office | 245 | Keokuk | 41 19 22 N | 092 19 49 W |
| Delwein City Park | Park | 305 | Fayette | 42 38 48 N | 091 54 60 W |
| Delwein Lake | Lake | 302 | Fayette | 42 39 10 N | 091 55 10 W |
| Delwood Elementary School | School | 252 | Clinton | 42 00 10 N | 090 36 19 W |
| Demco Business/Economics Center | Building | 439 | Sioux | 42 59 53 N | 096 03 28 W |
| Demoney Elementary School | School | 397 | Emmet | 43 23 60 N | 094 49 20 W |
| Denhart | Populated Place | 356 | Hancock | 42 57 58 N | 093 52 20 W |
| Denison | Locale | 361 | Crawford | 42 01 30 N | 095 21 32 W |
| Denison | Populated Place | 391 | Crawford | 42 01 04 N | 095 21 19 W |
| Denison Aquatic Fun Center | Park | 402 | Crawford | 42 01 33 N | 095 20 53 W |
| Denison Baptist Church | Church | 383 | Crawford | 42 00 58 N | 095 21 14 W |
| Denison Care Center | Hospital | 416 | Crawford | 42 01 54 N | 095 20 10 W |
| Denison Chiropractic Clinic | Hospital | 386 | Crawford | 42 00 60 N | 095 21 14 W |
| Denison City Hall | Building | 383 | Crawford | 42 01 25 N | 095 21 20 W |
| Denison Country Club | Locale | 377 | Crawford | 42 00 12 N | 095 20 21 W |
| Denison Elementary School | School | 375 | Crawford | 42 01 05 N | 095 20 35 W |
| Denison Fire Hall | Building | 377 | Crawford | 42 01 25 N | 095 21 24 W |
| Denison High School | School | 393 | Crawford | 42 01 39 N | 095 20 56 W |
| Denison Junior High School | School | 379 | Crawford | 42 00 59 N | 095 21 02 W |
| Denison Municipal Airport | Airport | 386 | Crawford | 41 59 11 N | 095 22 50 W |
| Denison Police Department | Building | 385 | Crawford | 42 01 04 N | 095 21 27 W |
| Denison Post Office | Post Office | 392 | Crawford | 42 01 05 N | 095 21 17 W |