Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Howard Residential Care Facility | Hospital | 384 | Howard | 43 23 59 N | 092 08 44 W |
| Howard Street Christian Church | Church | 243 | Jasper | 41 40 39 N | 093 14 50 W |
| Howards Bay | Bay | 426 | Dickinson | 43 24 08 N | 095 09 18 W |
| Howards Wood Recreation Area | Park | 299 | Floyd | 42 59 04 N | 092 33 43 W |
| Howardville | Populated Place | 347 | Floyd | 43 11 27 N | 092 42 45 W |
| Howardville Cemetery | Cemetery | 343 | Floyd | 43 11 12 N | 092 42 07 W |
| Howardville Post Office (historical) | Post Office | 347 | Floyd | 43 11 27 N | 092 42 31 W |
| Howardville Wesleyan Church | Church | 347 | Floyd | 43 11 27 N | 092 42 45 W |
| Howe | Populated Place | 365 | Adair | 41 24 11 N | 094 22 34 W |
| Howe Cabin Historical Marker | Park | 452 | Dickinson | 43 23 35 N | 095 04 11 W |
| Howe Hall | Building | 294 | Story | 42 01 37 N | 093 39 11 W |
| Howe Post Office (historical) | Post Office | 365 | Adair | 41 24 11 N | 094 22 34 W |
| Howe School | School | 332 | Boone | 42 02 09 N | 094 01 31 W |
| Howe School | School | 286 | Polk | 41 33 32 N | 093 36 15 W |
| Howell (historical) | Locale | 248 | Marion | 41 22 32 N | 092 58 01 W |
| Howell (historical) | Populated Place | 245 | Marion | 41 22 45 N | 092 58 06 W |
| Howell Cemetery | Cemetery | 269 | Davis | 40 36 54 N | 092 29 18 W |
| Howell Post Office (historical) | Post Office | 248 | Marion | 41 22 32 N | 092 58 01 W |
| Howell Station Campground Lake Red Rock | Locale | 213 | Marion | 41 21 54 N | 092 58 26 W |
| Howell Tree Farm | Locale | 303 | Madison | 41 27 30 N | 093 49 56 W |
| Howerdon Creek | Stream | | Madison | 41 22 52 N | 094 05 45 W |
| Hoyt Middle School | School | 268 | Polk | 41 37 10 N | 093 31 59 W |
| Hoyt Post Office (historical) | Post Office | 378 | Adams | 41 00 05 N | 094 52 11 W |
| Hoyt Sherman Place | Building | 270 | Polk | 41 35 20 N | 093 38 17 W |
| Hoyts Branch | Stream | | Cass | 41 15 47 N | 094 54 03 W |
| Hub City Heritage Railway Museum | Building | 318 | Fayette | 42 40 40 N | 091 55 02 W |
| Hubbard | Populated Place | 333 | Hardin | 42 18 20 N | 093 18 01 W |
| Hubbard (historical) | Locale | 335 | Hardin | 42 18 27 N | 093 17 56 W |
| Hubbard Cemetery | Cemetery | 240 | Davis | 40 37 20 N | 092 14 29 W |
| Hubbard Cemetery | Cemetery | 329 | Hardin | 42 17 58 N | 093 18 03 W |
| Hubbard City Hall | Building | 336 | Hardin | 42 18 21 N | 093 17 48 W |
| Hubbard Golf and Recreation Club | Locale | 337 | Hardin | 42 17 50 N | 093 17 11 W |
| Hubbard Park | Park | 198 | Johnson | 41 39 43 N | 091 32 21 W |
| Hubbard Park | Park | 377 | Woodbury | 42 31 07 N | 096 24 01 W |
| Hubbard Post Office | Post Office | 335 | Hardin | 42 18 21 N | 093 17 52 W |
| Hubbard Prairie | Park | 333 | Hardin | 42 18 40 N | 093 20 56 W |
| Hubbard Public Library | Building | 336 | Hardin | 42 18 21 N | 093 17 48 W |
| Hubbard Radcliffe Community School | School | 335 | Hardin | 42 18 14 N | 093 17 52 W |
| Hubbard-Radcliffe School | School | 361 | Hardin | 42 19 03 N | 093 26 05 W |
| Hubbel Island | Island | 180 | Jackson | 42 03 14 N | 090 10 17 W |
| Hubbel Slough | Stream | | Jackson | 42 02 54 N | 090 10 22 W |
| Hubbell Dining Hall | Building | 289 | Polk | 41 36 09 N | 093 39 26 W |
| Hubbell School | School | 295 | Polk | 41 35 31 N | 093 40 29 W |
| Hubler School | School | 242 | Wapello | 40 57 12 N | 092 22 01 W |
| Huckleberry Park | Park | 213 | Scott | 41 35 37 N | 090 21 48 W |
| Hudson | Populated Place | 275 | Black Hawk | 42 24 24 N | 092 27 20 W |
| Hudson (historical) | Locale | 274 | Black Hawk | 42 24 20 N | 092 27 33 W |
| Hudson Cemetery | Cemetery | 276 | Black Hawk | 42 24 01 N | 092 27 57 W |
| Hudson Community School | School | 289 | Black Hawk | 42 24 03 N | 092 27 12 W |
| Hudson Depot Museum | Building | 274 | Black Hawk | 42 24 29 N | 092 27 04 W |
| Hudson Fire Department | Building | 272 | Black Hawk | 42 24 31 N | 092 27 06 W |
| Hudson Park | Park | 286 | Black Hawk | 42 24 11 N | 092 27 17 W |
| Hudson Post Office | Post Office | 274 | Black Hawk | 42 24 23 N | 092 27 22 W |
| Hudson Public Library | Building | 274 | Black Hawk | 42 24 25 N | 092 27 19 W |
| Hudson Town Hall | Building | 272 | Black Hawk | 42 24 27 N | 092 27 19 W |
| Hudson United Methodist Church | Church | 282 | Black Hawk | 42 24 16 N | 092 27 13 W |
| Huff Access County Park | Park | 315 | Monona | 41 55 30 N | 096 08 02 W |
| Huff Farm Cemetery | Cemetery | 249 | Jackson | 42 11 59 N | 090 25 40 W |
| Huff Farm Cemetery | Cemetery | 251 | Jackson | 42 12 00 N | 090 25 41 W |
| Huff Farm Cemetery | Cemetery | 265 | Jackson | 42 12 00 N | 090 26 30 W |
| Hughes (historical) | Locale | 337 | Hardin | 42 23 51 N | 093 08 16 W |
| Hughes Cemetery | Cemetery | 260 | Marion | 41 28 56 N | 093 13 28 W |
| Hughes Post Office (historical) | Post Office | 337 | Hardin | 42 23 51 N | 093 08 16 W |
| Hughs | Populated Place | 314 | Hardin | 42 23 51 N | 093 09 28 W |
| Hugo Post Office (historical) | Post Office | 267 | Jackson | 42 16 20 N | 090 53 24 W |
| Hukill Farm Cemetery | Cemetery | 214 | Des Moines | 40 59 35 N | 091 05 31 W |
| Hull | Populated Place | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull (historical) | Locale | 436 | Sioux | 43 11 13 N | 096 07 56 W |
| Hull Cemetery | Cemetery | 324 | Boone | 41 57 37 N | 093 51 60 W |
| Hull Christian School | School | 438 | Sioux | 43 11 34 N | 096 07 46 W |
| Hull City Fire Department | Building | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull Cooperative Association Elevator | Locale | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull Family Physicians Building | Hospital | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull Police Department | Building | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull Post Office | Post Office | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull Post Office (historical) | Post Office | 335 | Boone | 41 59 28 N | 093 47 46 W |
| Hull Protestant Reformed Christian School | School | 441 | Sioux | 43 11 21 N | 096 08 46 W |
| Hull Public Library | Building | 439 | Sioux | 43 11 19 N | 096 08 01 W |
| Hull State Game Management Area | Park | 227 | Mahaska | 41 17 13 N | 092 45 02 W |
| Human Nutritional Sciences Building | Building | 291 | Story | 42 01 41 N | 093 38 50 W |
| Human Resources | Building | 292 | Polk | 41 36 11 N | 093 39 10 W |
| Humbert School | School | 284 | Black Hawk | 42 32 15 N | 092 27 27 W |
| Humboldt | Populated Place | 330 | Humboldt | 42 43 15 N | 094 12 55 W |
| Humboldt (historical) | Locale | 329 | Humboldt | 42 43 15 N | 094 12 28 W |
| Humboldt Care Center North | Hospital | 338 | Humboldt | 42 44 02 N | 094 13 30 W |
| Humboldt Care Center South | Hospital | 331 | Humboldt | 42 43 48 N | 094 13 38 W |
| Humboldt Chiropractic Center | Hospital | 329 | Humboldt | 42 43 17 N | 094 12 48 W |
| Humboldt City Hall | Building | 329 | Humboldt | 42 43 14 N | 094 12 51 W |
| Humboldt College (historical) | School | 330 | Humboldt | 42 43 15 N | 094 12 55 W |
| Humboldt Country Club | Locale | 329 | Humboldt | 42 43 50 N | 094 15 16 W |
| Humboldt County | Civil | 344 | Humboldt | 42 52 00 N | 094 12 01 W |
| Humboldt County Courthouse | Building | 345 | Humboldt | 42 43 18 N | 094 12 18 W |
| Humboldt County Dragway | Locale | 344 | Humboldt | 42 44 25 N | 094 09 11 W |
| Humboldt County Fairgrounds | Locale | 329 | Humboldt | 42 43 48 N | 094 12 41 W |
| Humboldt County Historical Museum | Building | 323 | Humboldt | 42 43 22 N | 094 11 29 W |
| Humboldt County Memorial Hospital | Hospital | 334 | Humboldt | 42 43 58 N | 094 13 56 W |
| Humboldt Eye Clinic | Hospital | 336 | Humboldt | 42 43 60 N | 094 13 31 W |
| Humboldt Fire Department | Building | 329 | Humboldt | 42 43 10 N | 094 13 09 W |
| Humboldt Fish Hatchery | Locale | 328 | Humboldt | 42 43 23 N | 094 13 40 W |
| Humboldt Group Home | Hospital | 332 | Humboldt | 42 43 29 N | 094 13 16 W |
| Humboldt Junior High School | School | 331 | Humboldt | 42 43 26 N | 094 13 06 W |
| Humboldt Law Enforcement Center | Building | 329 | Humboldt | 42 43 15 N | 094 12 51 W |
| Humboldt Municipal Airport | Airport | 335 | Humboldt | 42 44 10 N | 094 14 43 W |
| Humboldt Post Office | Post Office | 330 | Humboldt | 42 43 19 N | 094 13 05 W |
| Humboldt Public Library | Building | 330 | Humboldt | 42 43 19 N | 094 12 60 W |
| Humbolt High School | School | 348 | Humboldt | 42 42 56 N | 094 13 46 W |
| Humbolt Junior High School | School | 331 | Humboldt | 42 43 27 N | 094 13 08 W |
| Hume Cemetery | Cemetery | 359 | Fremont | 40 45 02 N | 095 43 01 W |
| Humes Cemetery | Cemetery | 244 | Keokuk | 41 24 31 N | 092 17 50 W |
| Humeston | Populated Place | 336 | Wayne | 40 51 32 N | 093 29 51 W |