Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Wallingford Lutheran Church | Church | 387 | Emmet | 43 19 13 N | 094 47 31 W |
| Wallingford Post Office | Post Office | 388 | Emmet | 43 19 11 N | 094 47 34 W |
| Wallingslock Creek | Stream | | Marion | 41 23 42 N | 092 59 56 W |
| Wallrich Lake | Lake | 187 | Washington | 41 14 12 N | 091 50 30 W |
| Wally World Campground | Locale | 162 | Lee | 40 36 33 N | 091 23 35 W |
| Wallys Woods | Park | 351 | Worth | 43 15 30 N | 093 23 21 W |
| Walnut | Populated Place | 406 | Pottawattamie | 41 28 39 N | 095 13 19 W |
| Walnut (historical) | Locale | 397 | Pottawattamie | 41 28 32 N | 095 13 19 W |
| Walnut Acres Campground | Locale | 245 | Jones | 42 15 32 N | 091 11 30 W |
| Walnut Catholic Cemetery | Cemetery | 409 | Pottawattamie | 41 28 59 N | 095 13 51 W |
| Walnut Catholic Church | Church | 409 | Pottawattamie | 41 28 60 N | 095 13 21 W |
| Walnut Cemetery | Cemetery | 217 | Jefferson | 41 07 25 N | 091 52 30 W |
| Walnut Cemetery | Cemetery | 344 | Montgomery | 40 57 07 N | 095 22 28 W |
| Walnut Cemetery | Cemetery | 397 | Pottawattamie | 41 28 35 N | 095 12 41 W |
| Walnut City | Populated Place | 302 | Appanoose | 40 48 44 N | 092 56 42 W |
| Walnut City Fire Department | Building | 406 | Pottawattamie | 41 28 39 N | 095 13 19 W |
| Walnut City Post Office (historical) | Post Office | 302 | Appanoose | 40 48 44 N | 092 56 42 W |
| Walnut Community School | School | 409 | Pottawattamie | 41 28 47 N | 095 13 18 W |
| Walnut County Opera House | Building | 406 | Pottawattamie | 41 28 39 N | 095 13 19 W |
| Walnut Creek | Stream | | Appanoose | 40 48 01 N | 092 52 34 W |
| Walnut Creek | Stream | | Clarke | 41 09 00 N | 093 43 36 W |
| Walnut Creek | Stream | | Crawford | 42 00 60 N | 095 18 34 W |
| Walnut Creek | Stream | | Fremont | 40 47 12 N | 095 35 24 W |
| Walnut Creek | Stream | | Jefferson | 41 03 51 N | 091 44 24 W |
| Walnut Creek | Stream | | Jones | 42 00 08 N | 091 07 38 W |
| Walnut Creek | Stream | | Marion | 41 15 36 N | 092 52 24 W |
| Walnut Creek | Stream | | Marion | 41 27 58 N | 093 12 59 W |
| Walnut Creek | Stream | | Polk | 41 34 04 N | 093 40 34 W |
| Walnut Creek | Stream | | Poweshiek | 41 51 53 N | 092 17 35 W |
| Walnut Creek | Stream | | Ringgold | 40 40 31 N | 094 21 02 W |
| Walnut Creek | Stream | | Scott | 41 30 10 N | 090 37 28 W |
| Walnut Creek | Stream | | Scott | 41 44 38 N | 090 44 46 W |
| Walnut Creek | Stream | | Story | 41 56 22 N | 093 32 38 W |
| Walnut Creek | Stream | | Washington | 41 11 17 N | 091 44 58 W |
| Walnut Creek | Stream | | Winneshiek | 43 17 55 N | 091 58 16 W |
| Walnut Creek Community Church | Church | 297 | Polk | 41 39 55 N | 093 45 21 W |
| Walnut Creek Community Church | Church | 269 | Polk | 41 35 47 N | 093 42 19 W |
| Walnut Creek Duck Marsh Dam | Dam | 318 | Ringgold | 40 41 30 N | 094 20 01 W |
| Walnut Creek Historical Museum | Building | 408 | Pottawattamie | 41 28 40 N | 095 13 21 W |
| Walnut Creek Lake | Reservoir | 322 | Ringgold | 40 41 38 N | 094 20 07 W |
| Walnut Creek National Wildlife Refuge | Park | 262 | Jasper | 41 34 20 N | 093 16 11 W |
| Walnut Creek Post Office (historical) | Post Office | 336 | Fremont | 40 46 42 N | 095 26 28 W |
| Walnut Elevator | Locale | 397 | Pottawattamie | 41 28 32 N | 095 13 19 W |
| Walnut Grove | Populated Place | 174 | Scott | 41 28 13 N | 090 39 41 W |
| Walnut Grove Baptist Church | Church | 299 | Pottawattamie | 41 16 16 N | 095 55 33 W |
| Walnut Grove Cemetery | Cemetery | 371 | Adams | 40 59 55 N | 094 44 26 W |
| Walnut Grove Cemetery | Cemetery | 256 | Jones | 41 57 57 N | 091 12 35 W |
| Walnut Grove Cemetery | Cemetery | 291 | Story | 41 56 49 N | 093 35 26 W |
| Walnut Grove Cemetery | Cemetery | 329 | Woodbury | 42 17 38 N | 096 16 47 W |
| Walnut Grove County Park | Park | 211 | Clinton | 41 54 37 N | 090 51 45 W |
| Walnut Grove Pioneer Village | Locale | 205 | Scott | 41 43 40 N | 090 31 50 W |
| Walnut Grove Post Office (historical) | Post Office | 212 | Scott | 41 43 40 N | 090 32 20 W |
| Walnut Grove School | School | 370 | Mills | 40 55 23 N | 095 45 09 W |
| Walnut Grove School | School | 300 | Pottawattamie | 41 16 17 N | 095 53 29 W |
| Walnut Grove School | School | 208 | Scott | 41 43 39 N | 090 31 54 W |
| Walnut Hill Cemetery | Cemetery | 225 | Jefferson | 41 02 30 N | 092 08 09 W |
| Walnut Hill Cemetery | Cemetery | 353 | Pottawattamie | 41 16 19 N | 095 49 33 W |
| Walnut Hill School (historical) | School | 188 | Scott | 41 30 31 N | 090 38 25 W |
| Walnut Hills United Methodist Church | Church | 287 | Polk | 41 36 55 N | 093 47 19 W |
| Walnut Medical Center | Hospital | 402 | Pottawattamie | 41 28 34 N | 095 13 19 W |
| Walnut Park | Park | 381 | Plymouth | 42 46 49 N | 096 10 04 W |
| Walnut Park Church | Church | 191 | Muscatine | 41 26 34 N | 091 01 08 W |
| Walnut Post Office | Post Office | 405 | Pottawattamie | 41 28 38 N | 095 13 18 W |
| Walnut Post Office (historical) | Post Office | 206 | Jefferson | 41 05 20 N | 091 54 31 W |
| Walnut Public Library | Building | 405 | Pottawattamie | 41 28 38 N | 095 13 21 W |
| Walnut Ridge Baptist Academy | School | 280 | Black Hawk | 42 28 08 N | 092 22 37 W |
| Walnut Ridge Baptist Church | Church | 280 | Black Hawk | 42 28 08 N | 092 22 37 W |
| Walnut Ridge Park | Park | 281 | Polk | 41 36 05 N | 093 45 57 W |
| Walnut School | School | 220 | Washington | 41 14 04 N | 091 46 13 W |
| Walnut Street First Baptist Church | Church | 206 | Des Moines | 40 46 40 N | 091 05 56 W |
| Walnut Welcome Center | Building | 406 | Pottawattamie | 41 28 39 N | 095 13 19 W |
| Walnut Woods State Park | Park | 250 | Polk | 41 32 33 N | 093 44 29 W |
| Walrod Cemetery | Cemetery | 210 | Clinton | 41 52 50 N | 090 34 40 W |
| Walsh Cemetery | Cemetery | 229 | Keokuk | 41 30 30 N | 091 59 31 W |
| Walsh High School | School | 198 | Wapello | 41 00 13 N | 092 25 38 W |
| Walsh Post Office (historical) | Post Office | 320 | Appanoose | 40 39 45 N | 093 05 49 W |
| Walters Heliport | Airport | 263 | Clayton | 42 48 21 N | 091 07 05 W |
| Walters Mill Post Office (historical) | Post Office | 279 | Jones | 42 10 58 N | 090 56 17 W |
| Walters Ridge Golf Course | Locale | 299 | Black Hawk | 42 31 60 N | 092 29 39 W |
| Waltham | Locale | 250 | Tama | 42 02 10 N | 092 21 08 W |
| Waltham Post Office (historical) | Post Office | 256 | Tama | 42 01 40 N | 092 20 51 W |
| Walthom Cemetery | Cemetery | 279 | Tama | 42 02 08 N | 092 19 59 W |
| Walton Cemetery | Cemetery | 257 | Clayton | 43 01 00 N | 091 12 00 W |
| Walton Cemetery | Cemetery | 242 | Keokuk | 41 21 30 N | 092 08 01 W |
| Walton Cemetery | Cemetery | 250 | Tama | 41 55 22 N | 092 21 57 W |
| Walton Creek | Stream | | Linn | 42 14 44 N | 091 34 34 W |
| Walton Dental Health Center | Hospital | 372 | Plymouth | 42 47 40 N | 096 10 08 W |
| Walton Golf Club | Locale | 231 | Jefferson | 41 00 50 N | 091 56 14 W |
| Walton Lake | Reservoir | 223 | Jefferson | 41 00 41 N | 091 56 02 W |
| Walton Picnic Area (historical) | Park | 229 | Johnson | 41 49 00 N | 091 40 10 W |
| Walz Cemetery | Cemetery | 265 | Tama | 41 56 03 N | 092 32 34 W |
| Wanamaker | Populated Place | 330 | Ringgold | 40 38 45 N | 094 06 35 W |
| Wanamaker Post Office (historical) | Post Office | 330 | Ringgold | 40 38 45 N | 094 06 35 W |
| Wanata State Park | Park | 372 | Clay | 42 54 44 N | 095 20 27 W |
| Wandering Creek Golf Course | Locale | 279 | Marshall | 42 01 05 N | 092 57 06 W |
| Waneta | Populated Place | 251 | Davis | 40 37 48 N | 092 16 11 W |
| Waneta Post Office (historical) | Post Office | 251 | Davis | 40 37 48 N | 092 16 11 W |
| Wanetta Corner | Populated Place | 253 | Davis | 40 37 28 N | 092 16 10 W |
| Wanetta School | School | 256 | Davis | 40 37 40 N | 092 16 09 W |
| Wanlock Post Office (historical) | Post Office | 255 | Monroe | 41 07 28 N | 092 59 01 W |
| Wantea Point | Cliff | 179 | Clinton | 42 01 42 N | 090 09 51 W |
| Wapello | Populated Place | 173 | Louisa | 41 10 53 N | 091 11 08 W |
| Wapello (historical) | Locale | 177 | Louisa | 41 10 45 N | 091 11 43 W |
| Wapello Cemetery | Cemetery | 177 | Louisa | 41 11 38 N | 091 12 22 W |
| Wapello Chiropractic Center | Hospital | 173 | Louisa | 41 10 50 N | 091 11 11 W |
| Wapello City Hall | Building | 175 | Louisa | 41 10 56 N | 091 11 13 W |
| Wapello County | Civil | 243 | Wapello | 41 02 00 N | 092 25 01 W |
| Wapello County Courthouse | Building | 208 | Wapello | 41 01 12 N | 092 24 39 W |
| Wapello County Fairgrounds | Locale | 187 | Wapello | 40 54 35 N | 092 12 51 W |
| Wapello County Grain Incorporated Elevator | Locale | 241 | Wapello | 41 03 20 N | 092 17 46 W |