Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Narrows River Access County Park | Park | 299 | Pottawattamie | 41 16 60 N | 095 52 33 W |
| Nasby Corner Cemetery | Cemetery | 239 | Wapello | 41 05 00 N | 092 20 31 W |
| Nasby School | School | 235 | Wapello | 41 04 34 N | 092 17 46 W |
| Nash Creek | Stream | | Buchanan | 42 24 20 N | 091 46 13 W |
| Nash Field | Airport | 299 | Warren | 41 18 14 N | 093 34 04 W |
| Nash Park | Park | 281 | Polk | 41 36 03 N | 093 37 48 W |
| Nash-Grover Residential Care Center | Hospital | 293 | Warren | 41 21 50 N | 093 34 27 W |
| Nasheim Post Office (historical) | Post Office | 386 | Winnebago | 43 28 24 N | 093 40 37 W |
| Nashua | Locale | 296 | Chickasaw | 42 57 05 N | 092 32 06 W |
| Nashua | Populated Place | 297 | Chickasaw | 42 57 10 N | 092 32 11 W |
| Nashua Area Medical Center | Hospital | 297 | Chickasaw | 42 57 09 N | 092 32 11 W |
| Nashua Cedar River Access | Locale | 292 | Chickasaw | 42 57 17 N | 092 32 09 W |
| Nashua Dental Office | Hospital | 296 | Chickasaw | 42 57 03 N | 092 32 11 W |
| Nashua Elementary School | School | 307 | Chickasaw | 42 56 59 N | 092 32 37 W |
| Nashua Plainfield High School | School | 302 | Chickasaw | 42 56 58 N | 092 32 25 W |
| Nashua Police Department | Building | 296 | Chickasaw | 42 57 06 N | 092 32 11 W |
| Nashua Post Office | Post Office | 297 | Chickasaw | 42 57 11 N | 092 32 11 W |
| Nashua Public Library | Building | 298 | Chickasaw | 42 57 10 N | 092 32 16 W |
| Nashua Town and Country Club | Locale | 309 | Chickasaw | 42 56 15 N | 092 32 16 W |
| Nashville | Populated Place | 220 | Jackson | 42 03 45 N | 090 47 02 W |
| Nashville (historical) | Locale | 220 | Jackson | 42 03 45 N | 090 47 02 W |
| Nashville Post Office (historical) | Post Office | 220 | Jackson | 42 03 45 N | 090 47 02 W |
| Nashville Post Office (historical) | Post Office | 164 | Lee | 40 30 01 N | 091 22 30 W |
| Nassau Township Cemetery | Cemetery | 422 | Sioux | 42 58 60 N | 096 01 56 W |
| Nassau Wildlife Area | Park | 392 | Sioux | 42 56 16 N | 096 01 53 W |
| Nasset | Populated Place | 292 | Winneshiek | 43 17 04 N | 091 40 01 W |
| Nasset Post Office (historical) | Post Office | 292 | Winneshiek | 43 17 04 N | 091 40 01 W |
| Natatorium | Building | 227 | Linn | 41 59 20 N | 091 39 32 W |
| Nathan Brown Historical Marker | Park | 263 | Linn | 42 03 22 N | 091 26 16 W |
| Nathan Winton Historical Marker | Park | 242 | Davis | 40 50 03 N | 092 14 39 W |
| Nathaniel Fellows Historical Marker | Park | 235 | Johnson | 41 41 21 N | 091 33 56 W |
| Nathaniel Hamlin Park | Park | 412 | Audubon | 41 41 45 N | 094 55 31 W |
| National | Locale | 328 | Clayton | 42 57 02 N | 091 17 21 W |
| National Balloon Museum | Building | 268 | Warren | 41 22 40 N | 093 33 34 W |
| National Cemetery | Cemetery | 338 | Clayton | 42 57 13 N | 091 17 25 W |
| National Cemetery | Cemetery | 187 | Lee | 40 23 55 N | 091 24 22 W |
| National Cemetery | Cemetery | 304 | Tama | 41 58 13 N | 092 22 15 W |
| National Czech and Slovak Museum and Library | Building | 222 | Linn | 41 57 47 N | 091 39 50 W |
| National Farm Toy Museum | Building | 294 | Dubuque | 42 28 05 N | 091 06 52 W |
| National Mississippi River Museum | Building | 184 | Dubuque | 42 29 48 N | 090 39 38 W |
| National Motorcycle Museum | Building | 252 | Jones | 42 06 32 N | 091 17 03 W |
| National Post Office (historical) | Post Office | 328 | Clayton | 42 57 02 N | 091 17 21 W |
| National River Hall of Fame | Building | 184 | Dubuque | 42 29 48 N | 090 39 37 W |
| National Soil Tilth Lab | Building | 284 | Story | 42 01 45 N | 093 38 36 W |
| National Sprint Car Hall of Fame and Museum | Building | 278 | Marion | 41 19 41 N | 093 06 39 W |
| National Swine Research Center | Building | 284 | Story | 42 01 45 N | 093 38 36 W |
| Nations Bridge County Park | Park | 302 | Guthrie | 41 34 36 N | 094 19 52 W |
| Nativity Catholic Church | Church | 273 | Dubuque | 42 30 01 N | 090 40 43 W |
| Nativity Church | Church | 386 | Woodbury | 42 27 08 N | 096 21 16 W |
| Nativity School | School | 266 | Dubuque | 42 30 00 N | 090 40 51 W |
| Nautrille Post Office (historical) | Post Office | 291 | Black Hawk | 42 38 06 N | 092 21 28 W |
| Navajo Park | Park | 246 | Linn | 41 55 52 N | 091 37 28 W |
| Naval Air Station Ottumwa (historical) | Military (Historical) | | Wapello | 41 06 24 N | 092 26 50 W |
| Navan | Populated Place | 329 | Winneshiek | 43 05 52 N | 092 03 46 W |
| Navan Post Office (historical) | Post Office | 349 | Winneshiek | 43 05 52 N | 092 02 31 W |
| Nazarene Church | Church | 301 | Mills | 41 02 29 N | 095 44 45 W |
| Nazarene Church | Church | 295 | Warren | 41 21 27 N | 093 33 39 W |
| Nazarene Church | Church | 356 | Wright | 42 43 22 N | 093 44 09 W |
| Nazareth Evangelical Lutheran Church | Church | 267 | Black Hawk | 42 30 43 N | 092 26 49 W |
| Nazareth Lutheran Church | Church | 382 | Emmet | 43 23 57 N | 094 28 58 W |
| Nazareth Lutheran Church | Church | 378 | Franklin | 42 44 14 N | 093 22 12 W |
| Nazareth Lutheran Church | Church | 264 | Story | 41 54 06 N | 093 32 03 W |
| NE Lutheran Congregational Carpenter Cemetery | Cemetery | 360 | Mitchell | 43 25 43 N | 093 01 26 W |
| Neal Cemetery | Cemetery | 289 | Madison | 41 23 40 N | 093 54 31 W |
| Neberry Cemetery | Cemetery | 162 | Des Moines | 40 58 00 N | 091 02 11 W |
| Nebowa Camp | Locale | 319 | Monona | 42 02 51 N | 096 09 24 W |
| Necot | Locale | 265 | Linn | 42 09 08 N | 091 24 15 W |
| Necot Post Office (historical) | Post Office | 277 | Linn | 42 08 50 N | 091 22 36 W |
| Needham Cemetery | Cemetery | 308 | Butler | 42 47 45 N | 092 58 31 W |
| Needmore Post Office (historical) | Post Office | 365 | Harrison | 41 39 05 N | 095 38 41 W |
| Neele Branch | Stream | | Page | 40 46 29 N | 094 59 43 W |
| Neeley Creek | Stream | | Fremont | 40 41 42 N | 095 42 33 W |
| Negro Creek | Stream | | Clinton | 41 53 10 N | 090 35 34 W |
| Negus Recreation Area | Park | 429 | O'Brien | 42 56 15 N | 095 29 14 W |
| Neil Armstrong School | School | 218 | Scott | 41 35 45 N | 090 30 02 W |
| Neil Armstrong School | School | 242 | Scott | 41 41 26 N | 090 32 32 W |
| Neils Post Office (historical) | Post Office | 393 | Winnebago | 43 19 37 N | 093 42 01 W |
| Neils Spur | Locale | 393 | Winnebago | 43 19 37 N | 093 42 01 W |
| Nelson | Locale | 435 | Guthrie | 41 41 21 N | 094 42 24 W |
| Nelson | Locale | 374 | Mitchell | 43 19 39 N | 092 36 04 W |
| Nelson Area County Park | Park | 365 | Cherokee | 42 51 52 N | 095 27 56 W |
| Nelson Cemetery | Cemetery | 277 | Iowa | 41 46 00 N | 091 59 51 W |
| Nelson Creek | Stream | | Linn | 42 07 37 N | 091 45 56 W |
| Nelson Creek | Stream | | Lyon | 43 15 31 N | 096 33 12 W |
| Nelson Creek | Stream | | O'Brien | 42 55 31 N | 095 38 14 W |
| Nelson Ditch | Canal | 310 | Harrison | 41 40 59 N | 095 59 06 W |
| Nelson Manor Nursing Home | Hospital | 287 | Jasper | 41 41 59 N | 093 02 04 W |
| Nelson Paradise Wildlife Area | Park | 353 | Mitchell | 43 28 20 N | 092 57 31 W |
| Nelson Park | Park | 394 | Crawford | 41 56 19 N | 095 35 26 W |
| Nelson Pioneer Farm Museum | Building | 238 | Mahaska | 41 19 57 N | 092 37 19 W |
| Nelson Plot | Cemetery | 346 | Allamakee | 43 14 40 N | 091 25 30 W |
| Nelson Post Office (historical) | Post Office | 435 | Guthrie | 41 41 21 N | 094 42 24 W |
| Nelson Post Office (historical) | Post Office | 363 | Mitchell | 43 18 45 N | 092 36 46 W |
| Nelson School | School | 216 | Johnson | 41 39 13 N | 091 31 10 W |
| Nelson Wildlife Area | Park | 316 | Chickasaw | 42 59 50 N | 092 29 16 W |
| Nem Con Post Office (historical) | Post Office | 273 | Madison | 41 20 05 N | 093 53 56 W |
| Nemaha | Populated Place | 403 | Sac | 42 30 57 N | 095 05 18 W |
| Nemaha (historical) | Locale | 403 | Sac | 42 30 60 N | 095 05 15 W |
| Nemaha Cemetery | Cemetery | 408 | Sac | 42 30 37 N | 095 05 27 W |
| Nemaha Community Hall | Building | 403 | Sac | 42 30 57 N | 095 05 18 W |
| Nemaha Post Office | Post Office | 403 | Sac | 42 30 57 N | 095 05 18 W |
| Nemaha United Methodist Church | Church | 403 | Sac | 42 30 57 N | 095 05 18 W |
| Neoga (historical) | Locale | 311 | Pottawattamie | 41 12 54 N | 095 47 01 W |
| Neoga Post Office (historical) | Post Office | 311 | Pottawattamie | 41 12 54 N | 095 47 01 W |
| Neola | Locale | 333 | Pottawattamie | 41 26 48 N | 095 37 11 W |
| Neola | Populated Place | 335 | Pottawattamie | 41 26 56 N | 095 36 56 W |
| Neola Cemetery | Cemetery | 373 | Pottawattamie | 41 27 31 N | 095 37 11 W |
| Neola City Hall | Building | 336 | Pottawattamie | 41 26 57 N | 095 36 59 W |
| Neola Creek | Stream | | Pottawattamie | 41 26 28 N | 095 37 09 W |
| Neola Elevator | Locale | 334 | Pottawattamie | 41 26 53 N | 095 37 02 W |