Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Pomo Post Office (historical) | Post Office | 395 | Shelby | 41 47 12 N | 095 27 11 W |
| Pond Creek Lake (historical) | Lake | 368 | Calhoun | 42 16 27 N | 094 40 51 W |
| Pond Valley Post Office (historical) | Post Office | 364 | Howard | 43 15 25 N | 092 12 29 W |
| Ponderosa Park Mobile Home Park | Populated Place | 183 | Scott | 41 30 58 N | 090 38 05 W |
| Ponderosa Public Golf Course | Locale | 293 | Polk | 41 33 45 N | 093 47 01 W |
| Ponona Post Office (historical) | Post Office | 423 | Plymouth | 42 47 37 N | 096 22 51 W |
| Pontoppidan Cemetery | Cemetery | 353 | Winneshiek | 43 16 29 N | 091 38 03 W |
| Pony | Locale | 329 | Bremer | 42 52 58 N | 092 23 49 W |
| Pony Creek | Stream | | Mills | 40 59 09 N | 095 48 59 W |
| Pony Creek Ditch | Canal | 292 | Mills | 41 01 01 N | 095 48 24 W |
| Pony Creek Lake | Reservoir | 317 | Mills | 41 04 12 N | 095 47 26 W |
| Pony Creek Park | Park | 324 | Mills | 41 04 16 N | 095 47 11 W |
| Pony Hollow Trail | Trail | 218 | Clayton | 42 50 25 N | 091 22 32 W |
| Pony Post Office (historical) | Post Office | 329 | Bremer | 42 52 58 N | 092 23 49 W |
| Pool Park | Park | 392 | Plymouth | 42 46 42 N | 096 09 45 W |
| Pool Slough | Gut | 194 | Allamakee | 43 29 09 N | 091 17 19 W |
| Pool Slough Wildlife Management Area | Park | 193 | Allamakee | 43 29 45 N | 091 16 40 W |
| Pool Wildlife Area | Park | 222 | Keokuk | 41 10 50 N | 092 01 41 W |
| Poor Farm Cemetery | Cemetery | 272 | Marion | 41 18 00 N | 093 07 51 W |
| Poor Farm Creek | Stream | | Buena Vista | 42 42 01 N | 095 04 38 W |
| Popejoy | Populated Place | 353 | Franklin | 42 35 38 N | 093 25 34 W |
| Popejoy (historical) | Locale | 351 | Franklin | 42 35 44 N | 093 25 37 W |
| Popejoy County Park | Park | 342 | Franklin | 42 35 00 N | 093 25 56 W |
| Popejoy Post Office | Post Office | 353 | Franklin | 42 35 38 N | 093 25 34 W |
| Poplar | Populated Place | 441 | Audubon | 41 41 20 N | 095 05 33 W |
| Poplar | Populated Place | 435 | Shelby | 41 41 18 N | 095 05 37 W |
| Poplar Cemetery | Cemetery | 388 | Shelby | 41 44 20 N | 095 09 41 W |
| Poplar Grove Post Office (historical) | Post Office | 338 | Hamilton | 42 24 50 N | 093 51 16 W |
| Poplar Grove Post Office (historical) | Post Office | 359 | Palo Alto | 42 57 55 N | 094 33 21 W |
| Poplar Post Office (historical) | Post Office | 441 | Audubon | 41 41 20 N | 095 05 33 W |
| Popp Access | Locale | 269 | Black Hawk | 42 23 45 N | 092 29 16 W |
| Port Allen | Locale | 185 | Louisa | 41 21 00 N | 091 22 46 W |
| Port Allen (historical) | Locale | 184 | Muscatine | 41 20 16 N | 091 21 12 W |
| Port Allen (historical) | Populated Place | 184 | Muscatine | 41 20 16 N | 091 21 12 W |
| Port Allen Post Office (historical) | Post Office | 184 | Muscatine | 41 20 16 N | 091 21 12 W |
| Port Louisa | Populated Place | 168 | Louisa | 41 14 21 N | 091 07 53 W |
| Port Louisa Cemetery | Cemetery | 202 | Louisa | 41 13 59 N | 091 08 17 W |
| Port Louisa Post Office (historical) | Post Office | 168 | Louisa | 41 14 21 N | 091 07 53 W |
| Port of Dubuque Iowa Welcome Center | Building | 190 | Dubuque | 42 29 48 N | 090 39 52 W |
| Port Richmond | Locale | 198 | Wapello | 41 00 27 N | 092 25 56 W |
| Port Richmond Post Office (historical) | Post Office | 198 | Wapello | 41 00 27 N | 092 25 56 W |
| Porter Cemetery | Cemetery | 301 | Appanoose | 40 40 27 N | 092 52 41 W |
| Porter Cemetery | Cemetery | 203 | Des Moines | 40 46 30 N | 091 10 11 W |
| Porter Cemetery | Cemetery | 264 | Keokuk | 41 29 47 N | 092 12 35 W |
| Porter Creek | Stream | | Crawford | 42 10 20 N | 095 14 11 W |
| Porter Grove Cemetery | Cemetery | 259 | Marion | 41 21 01 N | 092 52 36 W |
| Porter House Museum | Building | 275 | Winneshiek | 43 18 08 N | 091 47 23 W |
| Porter School | School | 350 | Pottawattamie | 41 27 48 N | 095 42 28 W |
| Portland | Locale | 327 | Cerro Gordo | 43 07 43 N | 093 07 25 W |
| Portland | Populated Place | 327 | Cerro Gordo | 43 07 43 N | 093 07 25 W |
| Portland Cemetery | Cemetery | 351 | Kossuth | 43 12 42 N | 094 08 57 W |
| Portland Post Office (historical) | Post Office | 327 | Cerro Gordo | 43 07 43 N | 093 07 25 W |
| Portland Post Office (historical) | Post Office | 190 | Van Buren | 40 50 02 N | 092 05 19 W |
| Portland Prairie Cemetery | Cemetery | 336 | Allamakee | 43 29 40 N | 091 27 31 W |
| Portland Townhall | Building | 351 | Kossuth | 43 12 36 N | 094 08 48 W |
| Portrait of Sir William Blackstone Historical Marker | Park | 211 | Johnson | 41 39 22 N | 091 32 06 W |
| Portsmouth | Locale | 365 | Shelby | 41 38 58 N | 095 31 01 W |
| Portsmouth | Populated Place | 373 | Shelby | 41 39 01 N | 095 31 07 W |
| Portsmouth Elevator | Locale | 373 | Shelby | 41 39 01 N | 095 31 07 W |
| Portsmouth Post Office | Post Office | 373 | Shelby | 41 39 01 N | 095 31 07 W |
| Posley Cemetery | Cemetery | 333 | Page | 40 42 53 N | 095 11 07 W |
| Possum Ditch | Canal | 283 | Fremont | 40 45 31 N | 095 45 23 W |
| Possum Hollow | Valley | | Lucas | 41 04 39 N | 093 10 09 W |
| Post Township Cemetery | Cemetery | 350 | Allamakee | 43 06 58 N | 091 32 57 W |
| Postville | Locale | 364 | Allamakee | 43 05 14 N | 091 34 16 W |
| Postville | Populated Place | 360 | Allamakee | 43 05 05 N | 091 34 06 W |
| Postville Cemetery | Cemetery | 359 | Clayton | 43 04 52 N | 091 33 57 W |
| Postville Chiropractic Clinic | Hospital | 365 | Allamakee | 43 05 18 N | 091 34 06 W |
| Postville City Ball Diamond | Locale | 365 | Allamakee | 43 05 19 N | 091 33 57 W |
| Postville Fire Department | Building | 360 | Allamakee | 43 05 13 N | 091 33 60 W |
| Postville Good Samaritan Center | Hospital | 351 | Allamakee | 43 04 56 N | 091 33 32 W |
| Postville High School | School | 360 | Allamakee | 43 04 58 N | 091 34 26 W |
| Postville Medical Clinic | Hospital | 360 | Allamakee | 43 05 11 N | 091 34 09 W |
| Postville Memorial Hall | Building | 360 | Allamakee | 43 05 13 N | 091 34 01 W |
| Postville Police Department | Building | 358 | Allamakee | 43 04 57 N | 091 33 41 W |
| Postville Post Office | Post Office | 360 | Allamakee | 43 05 03 N | 091 34 11 W |
| Postville Public Library | Building | 360 | Allamakee | 43 05 05 N | 091 34 16 W |
| Pot Hole Creek | Stream | | Decatur | 40 42 06 N | 093 54 09 W |
| Potato Creek | Stream | | Pottawattamie | 41 26 58 N | 095 44 54 W |
| Potatoe Creek | Stream | | Jasper | 41 49 33 N | 092 57 13 W |
| Potosia | Populated Place | 384 | Plymouth | 42 39 49 N | 096 22 19 W |
| Potosia Post Office (historical) | Post Office | 384 | Plymouth | 42 39 49 N | 096 22 19 W |
| Pottawattami County Home | Building | 386 | Pottawattamie | 41 19 37 N | 095 40 09 W |
| Pottawattamie County | Civil | 373 | Pottawattamie | 41 20 00 N | 095 32 01 W |
| Pottawattamie County Courthouse | Building | 303 | Pottawattamie | 41 15 26 N | 095 51 11 W |
| Pottawattamie County Home Cemetery | Cemetery | 386 | Pottawattamie | 41 19 37 N | 095 40 09 W |
| Pottawattamie County Sheriffs Office | Building | 299 | Pottawattamie | 41 16 60 N | 095 51 56 W |
| Potter | Populated Place | 262 | Tama | 41 57 36 N | 092 40 31 W |
| Potter (historical) | Locale | 262 | Tama | 41 57 36 N | 092 40 31 W |
| Potter Cemetery | Cemetery | 230 | Jackson | 42 17 35 N | 090 29 15 W |
| Potter Post Office (historical) | Post Office | 262 | Tama | 41 57 36 N | 092 40 31 W |
| Potter's Mill (historical) | Locale | 183 | Jackson | 42 15 03 N | 090 25 16 W |
| Potter's Timber Cemetery | Cemetery | 192 | Louisa | 41 05 30 N | 091 07 51 W |
| Potteroff Creek | Stream | | Decatur | 40 39 35 N | 093 51 40 W |
| Potters Branch | Stream | | Van Buren | 40 41 42 N | 091 46 54 W |
| Potters Park | Park | 390 | Shelby | 41 39 03 N | 095 19 37 W |
| Potterweld Apartments | Building | 259 | Dubuque | 42 29 37 N | 090 41 52 W |
| Pottsville Post Office (historical) | Post Office | 226 | Washington | 41 16 20 N | 091 33 11 W |
| Poultney Post Office (historical) | Post Office | 324 | Delaware | 42 35 00 N | 091 09 30 W |
| Pound Pits | Park | 314 | Greene | 42 04 30 N | 094 14 51 W |
| Poverty Hollow | Valley | | Monona | 42 12 53 N | 095 54 34 W |
| Powell Cemetery | Cemetery | 323 | Madison | 41 27 00 N | 094 01 01 W |
| Powell Creek | Stream | | Buena Vista | 42 38 39 N | 095 14 41 W |
| Powell School | School | 319 | Clarke | 41 05 07 N | 093 34 43 W |
| Power Plant | Building | 196 | Johnson | 41 39 26 N | 091 32 20 W |
| Powers-Warren Cemetery | Cemetery | 273 | Polk | 41 32 41 N | 093 25 22 W |
| Powersville | Populated Place | 315 | Floyd | 42 56 11 N | 092 41 14 W |
| Powersville Post Office (historical) | Post Office | 315 | Floyd | 42 56 11 N | 092 41 14 W |
| Poweshiek County | Civil | 273 | Poweshiek | 41 41 00 N | 092 32 01 W |
| Poweshiek County Courthouse | Building | 290 | Poweshiek | 41 35 06 N | 092 31 37 W |