Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Murphy Park | Park | 277 | Polk | 41 37 27 N | 093 42 23 W |
| Murphy Post Office (historical) | Post Office | 253 | Jasper | 41 39 35 N | 092 58 26 W |
| Murphys Guest Home | Hospital | 295 | Warren | 41 21 36 N | 093 33 31 W |
| Murphys Landing Strip | Airport | 306 | Monroe | 40 54 51 N | 093 02 51 W |
| Murray | Locale | 372 | Clarke | 41 02 33 N | 093 57 01 W |
| Murray | Populated Place | 371 | Clarke | 41 02 30 N | 093 56 58 W |
| Murray Baptist Church | Church | 369 | Clarke | 41 02 22 N | 093 57 02 W |
| Murray Cemetery | Cemetery | 364 | Clarke | 41 01 40 N | 093 56 45 W |
| Murray Cemetery | Cemetery | 321 | Lucas | 40 55 10 N | 093 24 50 W |
| Murray Cemetery | Cemetery | 248 | Warren | 41 28 04 N | 093 19 43 W |
| Murray City hall | Building | 370 | Clarke | 41 02 29 N | 093 56 57 W |
| Murray Creek | Stream | | Clay | 42 57 10 N | 095 25 25 W |
| Murray Fire Department | Building | 370 | Clarke | 41 02 29 N | 093 56 57 W |
| Murray Hall | Building | 225 | Linn | 41 59 14 N | 091 39 37 W |
| Murray Hill Overlook | Locale | 344 | Harrison | 41 50 08 N | 096 00 07 W |
| Murray Island | Island | 188 | Allamakee | 43 10 54 N | 091 09 25 W |
| Murray Junior-Senior High School | School | 371 | Clarke | 41 02 20 N | 093 57 15 W |
| Murray Medical Clinic | Hospital | 371 | Clarke | 41 02 30 N | 093 56 59 W |
| Murray Post Office | Post Office | 370 | Clarke | 41 02 29 N | 093 56 57 W |
| Murray Public Library | Building | 370 | Clarke | 41 02 29 N | 093 56 57 W |
| Murray Roadside Rest Area | Locale | 361 | Clarke | 41 01 34 N | 093 56 51 W |
| Murray United Methodist Church | Church | 372 | Clarke | 41 02 38 N | 093 57 01 W |
| Murray Wildlife Area | Park | 374 | Howard | 43 20 40 N | 092 08 21 W |
| Murty Cemetery (historical) | Cemetery | 268 | Tama | 42 01 00 N | 092 43 01 W |
| Muscatine | Locale | 178 | Muscatine | 41 25 10 N | 091 02 46 W |
| Muscatine | Populated Place | 177 | Muscatine | 41 25 28 N | 091 02 36 W |
| Muscatine Baptist Chapel | Church | 167 | Muscatine | 41 24 25 N | 091 03 46 W |
| Muscatine Care Center | Hospital | 201 | Muscatine | 41 26 08 N | 091 03 57 W |
| Muscatine City Hall | Building | 172 | Muscatine | 41 25 19 N | 091 02 40 W |
| Muscatine Community College | School | 200 | Muscatine | 41 26 27 N | 091 01 33 W |
| Muscatine County | Civil | 213 | Muscatine | 41 28 00 N | 091 08 01 W |
| Muscatine County Care Facility | Building | 219 | Muscatine | 41 25 47 N | 091 04 47 W |
| Muscatine County Courthouse | Building | 175 | Muscatine | 41 25 30 N | 091 02 43 W |
| Muscatine County Home | Building | 211 | Muscatine | 41 25 58 N | 091 05 05 W |
| Muscatine County Sheriffs Department | Building | 176 | Muscatine | 41 25 32 N | 091 02 44 W |
| Muscatine Fire Department | Building | 167 | Muscatine | 41 24 17 N | 091 03 47 W |
| Muscatine Fire Department | Building | 175 | Muscatine | 41 25 30 N | 091 02 43 W |
| Muscatine Foot and Ankle Clinic | Hospital | 203 | Muscatine | 41 27 00 N | 091 01 51 W |
| Muscatine General Hospital | Hospital | 196 | Muscatine | 41 25 59 N | 091 03 17 W |
| Muscatine Health Center | Hospital | 198 | Muscatine | 41 26 00 N | 091 03 16 W |
| Muscatine Iowa Associates Building | Hospital | 198 | Muscatine | 41 26 31 N | 091 01 51 W |
| Muscatine Island | Island | 165 | Louisa | 41 20 00 N | 091 06 16 W |
| Muscatine Island | Island | 165 | Muscatine | 41 23 23 N | 091 05 48 W |
| Muscatine Island Pumping Station | Locale | 165 | Louisa | 41 14 05 N | 091 06 51 W |
| Muscatine Mall | Locale | 198 | Muscatine | 41 26 50 N | 091 01 41 W |
| Muscatine Medical Surgical Center | Hospital | 194 | Muscatine | 41 26 03 N | 091 03 21 W |
| Muscatine Municipal Airport | Airport | 165 | Muscatine | 41 22 00 N | 091 08 44 W |
| Muscatine Municipal Electric Plant | Locale | 168 | Muscatine | 41 23 30 N | 091 03 20 W |
| Muscatine Musicipal Golf Course | Locale | 212 | Muscatine | 41 28 30 N | 091 02 41 W |
| Muscatine Police Department | Building | 175 | Muscatine | 41 25 30 N | 091 02 43 W |
| Muscatine Post Office | Post Office | 214 | Muscatine | 41 26 08 N | 091 04 47 W |
| Muscatine Slough | Stream | | Louisa | 41 15 07 N | 091 06 58 W |
| Museum of Amana History | Building | 224 | Iowa | 41 48 01 N | 091 52 11 W |
| Museum of Art | Building | 198 | Johnson | 41 39 55 N | 091 32 25 W |
| Museum of Natural History | Building | 211 | Johnson | 41 39 43 N | 091 32 03 W |
| Museum of Religious Arts | Building | 332 | Harrison | 41 38 35 N | 095 47 20 W |
| Museum of River History | Building | 206 | Allamakee | 43 21 44 N | 091 12 59 W |
| Musfeldt Cemetery | Cemetery | 263 | Clayton | 42 44 25 N | 091 20 02 W |
| Music Building | Building | 294 | Polk | 41 44 10 N | 093 37 35 W |
| Music Building | Building | 445 | Sioux | 43 04 58 N | 096 09 54 W |
| Music Hall | Building | 289 | Story | 42 01 29 N | 093 38 52 W |
| Music Practice House | Building | 271 | Linn | 41 55 34 N | 091 25 27 W |
| Muskrat Hollow | Valley | | Jackson | 42 08 33 N | 090 16 51 W |
| Muskrat Lake | Lake | 168 | Louisa | 41 12 26 N | 091 12 09 W |
| Muskrat Slough State Game Management Area | Park | 238 | Jones | 41 59 39 N | 091 12 18 W |
| Muslim Cemetery | Cemetery | 275 | Black Hawk | 42 29 02 N | 092 16 55 W |
| Musser Park | Park | 167 | Muscatine | 41 24 24 N | 091 03 44 W |
| Musser Public Library | Building | 179 | Muscatine | 41 25 20 N | 091 02 51 W |
| Musserville United Methodist Church | Church | 166 | Muscatine | 41 24 20 N | 091 03 50 W |
| Mustard Lateral | Canal | 284 | Fremont | 40 47 19 N | 095 47 03 W |
| Myer Property Cemetery | Cemetery | 331 | Dubuque | 42 37 40 N | 091 05 00 W |
| Myers Cemetery | Cemetery | 306 | Dallas | 41 45 21 N | 094 04 04 W |
| Myers Cemetery | Cemetery | 235 | Jefferson | 41 05 21 N | 092 07 20 W |
| Myers Post Office (historical) | Post Office | 397 | Union | 41 02 10 N | 094 19 09 W |
| Myers School | School | 318 | Lucas | 40 55 23 N | 093 15 35 W |
| Myre Slough State Game Management Area | Park | 387 | Winnebago | 43 17 39 N | 093 46 07 W |
| Myre Timber | Park | 372 | Worth | 43 23 12 N | 093 16 16 W |
| Myrick Cemetery | Cemetery | 213 | Wapello | 41 05 00 N | 092 32 01 W |
| Myrland Ditch | Canal | 320 | Monona | 42 05 03 N | 096 09 58 W |
| Myron Post Office (historical) | Post Office | 269 | Allamakee | 43 09 42 N | 091 31 41 W |
| Myrtle Post Office (historical) | Post Office | 192 | Muscatine | 41 24 30 N | 091 16 06 W |
| Myrtue Memorial Hospital | Hospital | 381 | Shelby | 41 38 48 N | 095 19 34 W |
| Myrtue Memorial Hospital Heliport | Airport | 384 | Shelby | 41 38 57 N | 095 19 27 W |
| Mystic | Locale | 271 | Appanoose | 40 46 40 N | 092 56 31 W |
| Mystic | Populated Place | 274 | Appanoose | 40 46 39 N | 092 56 38 W |
| Mystic City Hall | Building | 274 | Appanoose | 40 46 39 N | 092 56 38 W |
| Mystic Elementary School | School | 274 | Appanoose | 40 46 39 N | 092 56 38 W |
| Mystic Fire Department | Building | 274 | Appanoose | 40 46 39 N | 092 56 38 W |
| Mystic Post Office | Post Office | 274 | Appanoose | 40 46 39 N | 092 56 38 W |
| Mystic Reservoir | Reservoir | 288 | Appanoose | 40 47 28 N | 092 56 44 W |
| Mystic Reservoir Dam | Dam | 271 | Appanoose | 41 47 29 N | 092 56 45 W |
| N J Nugen Public Library | Building | 233 | Henry | 40 55 32 N | 091 24 10 W |
| Nabotna Pond | Reservoir | 393 | Audubon | 41 45 31 N | 094 52 56 W |
| Nabotna Pond Park | Park | 392 | Audubon | 41 45 26 N | 094 52 57 W |
| Nagle Creek | Stream | | Fayette | 42 48 08 N | 091 31 58 W |
| Nagle Wildlife Area | Park | 313 | Floyd | 43 05 15 N | 092 59 21 W |
| Nahant | Populated Place | 171 | Scott | 41 29 15 N | 090 38 16 W |
| Nahant Marsh | Swamp | | Scott | 41 29 28 N | 090 38 15 W |
| Nahant Marsh Outdoor Education and Research Center | Building | | Scott | 41 29 14 N | 090 38 10 W |
| Nain Lutheran Church | Church | 388 | Buena Vista | 42 36 40 N | 095 00 23 W |
| Nancy Elaine Lake | Lake | 174 | Clinton | 41 47 06 N | 090 17 08 W |
| Nanito | Populated Place | 379 | Adair | 41 18 56 N | 094 17 23 W |
| Nanito Post Office (historical) | Post Office | 359 | Adair | 41 18 35 N | 094 19 46 W |
| Nansen | Populated Place | 385 | Chickasaw | 43 06 43 N | 092 14 16 W |
| Nansen Post Office (historical) | Post Office | 349 | Chickasaw | 43 08 60 N | 092 14 51 W |
| Napier | Populated Place | 320 | Boone | 41 58 47 N | 093 43 05 W |
| Napier Community Church | Church | 320 | Boone | 41 58 47 N | 093 43 05 W |
| Napier United Methodist Church | Church | 320 | Boone | 41 58 47 N | 093 43 05 W |
| Napoleon Park | Park | 195 | Johnson | 41 38 00 N | 091 32 11 W |
| Napsineke Heights | Locale | 206 | Scott | 41 36 49 N | 090 21 33 W |