Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Red Oak Municipal Airport | Airport | 317 | Montgomery | 41 00 37 N | 095 15 36 W |
| Red Oak Number One School (historical) | School | 246 | Cedar | 41 46 30 N | 091 08 36 W |
| Red Oak Park | Park | 245 | Cedar | 41 50 04 N | 091 09 39 W |
| Red Oak Physicians Clinic | Hospital | 358 | Montgomery | 41 01 38 N | 095 12 53 W |
| Red Oak Police Department | Building | 320 | Montgomery | 41 00 35 N | 095 13 34 W |
| Red Oak Post Office | Post Office | 319 | Montgomery | 41 00 33 N | 095 13 35 W |
| Red Oak Post Office (historical) | Post Office | 261 | Cedar | 41 50 47 N | 091 09 31 W |
| Red Oak Presbyterian Church | Church | 320 | Montgomery | 41 00 32 N | 095 13 33 W |
| Red Oak Public Library | Building | 317 | Montgomery | 41 00 30 N | 095 13 48 W |
| Red Oak School (historical) | School | 251 | Clinton | 41 47 09 N | 090 52 53 W |
| Red Rock (historical) | Locale | 222 | Marion | 41 25 30 N | 093 06 55 W |
| Red Rock Cemetery | Cemetery | 240 | Marion | 41 25 48 N | 093 07 17 W |
| Red Rock Dam | Dam | 221 | Marion | 41 22 21 N | 092 58 51 W |
| Red Rock Line Historical Marker | Park | 337 | Hardin | 42 23 51 N | 093 08 16 W |
| Red Rock Line Indian Treaty Historical Marker | Park | 279 | Marion | 41 19 07 N | 093 05 50 W |
| Red Rock Post Office (historical) | Post Office | 222 | Marion | 41 25 35 N | 093 06 51 W |
| Red Rock Public Hunting Area | Area | 261 | Marion | 41 25 45 N | 093 04 56 W |
| Red Rock Visitor Center | Building | 221 | Marion | 41 22 06 N | 092 59 14 W |
| Red Rock Wildlife Area | Park | 229 | Marion | 41 29 10 N | 093 18 01 W |
| Red Schoolhouse | Locale | 299 | Delaware | 42 32 15 N | 091 25 49 W |
| Red Wing Access | Locale | 150 | Lee | 40 22 50 N | 091 27 11 W |
| Redbird Farms Wildlife Area | Park | 215 | Johnson | 41 37 00 N | 091 42 56 W |
| Redd Cemetery | Cemetery | 320 | Fremont | 40 41 39 N | 095 36 58 W |
| Redding | Populated Place | 349 | Ringgold | 40 36 17 N | 094 23 16 W |
| Redding (historical) | Locale | 349 | Ringgold | 40 36 17 N | 094 23 16 W |
| Redding Cemetery | Cemetery | 343 | Franklin | 42 39 42 N | 093 08 40 W |
| Redding Cemetery | Cemetery | 338 | Ringgold | 40 36 12 N | 094 22 39 W |
| Redding Post Office (historical) | Post Office | 309 | Ringgold | 40 37 50 N | 094 23 15 W |
| Reddish School | School | 296 | Warren | 41 21 08 N | 093 41 32 W |
| Redeemer Alliance Reformed Church | Church | 429 | Sioux | 42 59 52 N | 096 03 51 W |
| Redeemer Chapel | Church | 386 | Woodbury | 42 27 11 N | 096 20 38 W |
| Redeemer Evangelical Lutheran Church | Church | 299 | Pottawattamie | 41 15 33 N | 095 53 20 W |
| Redeemer Lutheran Church | Church | 384 | Adams | 40 59 56 N | 094 44 16 W |
| Redeemer Lutheran Church | Church | 254 | Black Hawk | 42 24 44 N | 092 16 09 W |
| Redeemer Lutheran Church | Church | 295 | Bremer | 42 43 30 N | 092 29 44 W |
| Redeemer Lutheran Church | Church | 380 | Cerro Gordo | 43 07 28 N | 093 28 35 W |
| Redeemer Lutheran Church | Church | 352 | Chickasaw | 43 03 41 N | 092 19 23 W |
| Redeemer Lutheran Church | Church | 375 | Crawford | 42 01 00 N | 095 20 57 W |
| Redeemer Lutheran Church | Church | 404 | Emmet | 43 24 40 N | 094 49 34 W |
| Redeemer Lutheran Church | Church | 361 | Fayette | 42 57 50 N | 091 48 53 W |
| Redeemer Lutheran Church | Church | 286 | Marshall | 42 01 45 N | 092 54 45 W |
| Redeemer Lutheran Church | Church | 290 | Polk | 41 36 03 N | 093 39 58 W |
| Redeemer Lutheran Church | Church | 214 | Scott | 41 33 36 N | 090 30 59 W |
| Redeemer Lutheran Church | Church | 285 | Warren | 41 21 45 N | 093 34 46 W |
| Redeemer Lutheran Church | Church | 383 | Woodbury | 42 27 10 N | 096 20 36 W |
| Redeker Center | Building | 279 | Black Hawk | 42 30 43 N | 092 27 48 W |
| Redemption Missionary Baptist Church | Church | 222 | Linn | 41 57 45 N | 091 39 59 W |
| Redfield | Populated Place | 295 | Dallas | 41 35 22 N | 094 11 46 W |
| Redfield (historical) | Locale | 293 | Dallas | 41 35 18 N | 094 11 41 W |
| Redfield Christian Church | Church | 300 | Dallas | 41 35 30 N | 094 11 40 W |
| Redfield City Hall | Building | 296 | Dallas | 41 35 24 N | 094 11 44 W |
| Redfield Medical Clinic | Hospital | 303 | Dallas | 41 35 32 N | 094 11 44 W |
| Redfield Post Office | Post Office | 297 | Dallas | 41 35 24 N | 094 11 45 W |
| Redfield Public Library | Building | 296 | Dallas | 41 35 24 N | 094 11 42 W |
| Redhead Park | Park | 253 | Polk | 41 35 32 N | 093 35 12 W |
| Redidence on the Hill | Building | 274 | Black Hawk | 42 30 30 N | 092 27 06 W |
| Redline Church of Christ | Church | 386 | Shelby | 41 43 02 N | 095 09 06 W |
| Redline Post Office (historical) | Post Office | 384 | Shelby | 41 43 02 N | 095 09 04 W |
| Redman (historical) | Populated Place | 260 | Tama | 41 58 09 N | 092 17 58 W |
| Redman Cemetery | Cemetery | 268 | Benton | 41 58 16 N | 092 17 31 W |
| Redman Cemetery | Cemetery | 249 | Clayton | 42 42 30 N | 091 05 00 W |
| Redman Post Office (historical) | Post Office | 260 | Tama | 41 58 09 N | 092 17 58 W |
| Redmans Branch | Stream | | Decatur | 40 50 14 N | 093 51 21 W |
| Redmond Park | Park | 227 | Linn | 41 59 14 N | 091 38 54 W |
| Redtail Ridge Habitat Area | Park | 351 | Cherokee | 42 40 10 N | 095 34 31 W |
| Reeceville | Populated Place | 241 | Jackson | 42 07 36 N | 090 17 54 W |
| Reed Cemetery | Cemetery | 220 | Jackson | 42 06 00 N | 090 26 30 W |
| Reed Cemetery | Cemetery | 211 | Keokuk | 41 14 08 N | 092 01 19 W |
| Reed House | Hospital | 398 | Crawford | 42 01 12 N | 095 20 13 W |
| Reed Park | Park | 257 | Black Hawk | 42 29 56 N | 092 20 36 W |
| Reed Park | Park | 224 | Linn | 41 58 10 N | 091 40 40 W |
| Reed's Creek Cemetery | Cemetery | 196 | Van Buren | 40 41 30 N | 091 45 31 W |
| Reeder Mills Post Office (historical) | Post Office | 374 | Harrison | 41 36 50 N | 095 42 51 W |
| Reeds Cemetery | Cemetery | 345 | Clayton | 42 44 08 N | 091 36 18 W |
| Reeds Chapel | Church | 330 | Dubuque | 42 27 04 N | 090 45 45 W |
| Reeds Chapel Methodist Cemetery | Cemetery | 329 | Dubuque | 42 27 04 N | 090 45 43 W |
| Reeds Creek | Stream | | Van Buren | 40 41 12 N | 091 45 59 W |
| Reeds Ridge Post Office (historical) | Post Office | 330 | Allamakee | 43 22 10 N | 091 31 31 W |
| Reedsville Post Office (historical) | Post Office | 299 | Marshall | 42 03 50 N | 092 47 31 W |
| Reedy Park | Park | 344 | Fayette | 42 40 32 N | 091 53 59 W |
| Reel Cemetery | Cemetery | 263 | Jackson | 42 06 18 N | 090 51 05 W |
| Reels | Locale | 315 | Pottawattamie | 41 24 43 N | 095 50 17 W |
| Reels Cemetery | Cemetery | 363 | Pottawattamie | 41 25 30 N | 095 50 01 W |
| Reels Post Office (historical) | Post Office | 315 | Pottawattamie | 41 24 43 N | 095 50 17 W |
| Rees Cemetery | Cemetery | 248 | Marion | 41 25 14 N | 093 10 22 W |
| Rees Park | Park | 197 | Lee | 40 23 18 N | 091 24 31 W |
| Reeseville Cemetery | Cemetery | 257 | Jackson | 42 07 46 N | 090 18 06 W |
| Reeve | Populated Place | 355 | Franklin | 42 40 20 N | 093 15 38 W |
| Reeve (historical) | Locale | 363 | Franklin | 42 41 15 N | 093 13 58 W |
| Reeve Post Office (historical) | Post Office | 363 | Franklin | 42 41 15 N | 093 13 58 W |
| Reformatory Cemetery | Cemetery | 362 | Calhoun | 42 23 43 N | 094 36 14 W |
| Reformed Baptist Church | Church | 257 | Tama | 41 57 57 N | 092 34 47 W |
| Reformed Church in America | Church | 432 | Sioux | 42 59 49 N | 096 03 00 W |
| Reformed Church in the United States | Church | 372 | Hancock | 43 03 15 N | 093 36 57 W |
| Reformed Church of Stout | Church | 311 | Grundy | 42 31 35 N | 092 42 43 W |
| Reformed Church of Stout Cemetery | Cemetery | 314 | Grundy | 42 31 25 N | 092 42 46 W |
| Reformed Church of the Latter Day Saints | Church | 201 | Scott | 41 32 49 N | 090 29 14 W |
| Reformed Presbyterian Church | Church | 229 | Washington | 41 17 44 N | 091 41 48 W |
| Reg Johnson Hall | Building | 344 | Hardin | 42 31 36 N | 093 16 03 W |
| Regency Care Center | Hospital | 290 | Warren | 41 28 57 N | 093 40 48 W |
| Regency Manor Mobile Home Park | Populated Place | 282 | Polk | 41 31 15 N | 093 35 21 W |
| Regency of Iowa Mobile Home Park | Populated Place | 297 | Pottawattamie | 41 13 35 N | 095 52 21 W |
| Regency of Sioux City | Populated Place | 376 | Woodbury | 42 29 10 N | 096 21 16 W |
| Regency Park | Park | 434 | Sioux | 43 03 25 N | 096 10 26 W |
| Regency Retirement Residence | Hospital | 357 | Montgomery | 41 01 38 N | 095 13 01 W |
| Regency Square Mall | Locale | 333 | Cerro Gordo | 43 08 50 N | 093 09 59 W |
| Regents Center | Building | 268 | Winneshiek | 43 18 50 N | 091 48 24 W |
| Regina High School | School | 235 | Johnson | 41 40 00 N | 091 30 15 W |
| Regional Medical Center | Hospital | 297 | Delaware | 42 29 04 N | 091 27 60 W |
| Regional Pathologists Center | Hospital | 342 | Webster | 42 29 21 N | 094 11 42 W |