Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Messiah Lutheran Church | Church | 314 | Floyd | 43 03 57 N | 092 39 41 W |
| Messiah Lutheran Church | Church | 181 | Lee | 40 24 25 N | 091 23 06 W |
| Messiahs Temple | Church | 215 | Scott | 41 32 03 N | 090 34 20 W |
| Mestad Spring | Spring | 315 | Winneshiek | 43 26 47 N | 091 41 25 W |
| Mestad Spring Access Area | Locale | 298 | Winneshiek | 43 26 43 N | 091 41 19 W |
| Metals Development Building | Building | 290 | Story | 42 01 51 N | 093 38 54 W |
| Metcalf Cemetery | Cemetery | 347 | Winneshiek | 43 27 00 N | 091 57 31 W |
| Methodist Camp Post Office (historical) | Post Office | 444 | Dickinson | 43 25 28 N | 095 09 43 W |
| Methodist Cemetery | Cemetery | 330 | Floyd | 43 03 29 N | 092 47 24 W |
| Methodist Cemetery | Cemetery | 312 | Marshall | 41 53 56 N | 092 56 29 W |
| Methodist Cemetery | Cemetery | 348 | Winneshiek | 43 25 20 N | 091 39 34 W |
| Methodist Church | Church | 302 | Appanoose | 40 41 06 N | 092 40 32 W |
| Methodist Church | Church | 268 | Benton | 42 15 18 N | 092 05 34 W |
| Methodist Church | Church | 338 | Boone | 42 09 52 N | 094 00 60 W |
| Methodist Church | Church | 286 | Bremer | 42 50 48 N | 092 32 07 W |
| Methodist Church | Church | 362 | Cerro Gordo | 42 56 41 N | 093 23 01 W |
| Methodist Church | Church | 361 | Cherokee | 42 37 54 N | 095 38 25 W |
| Methodist Church | Church | 415 | Crawford | 41 53 16 N | 095 13 56 W |
| Methodist Church | Church | 314 | Grundy | 42 21 38 N | 092 46 18 W |
| Methodist Church | Church | 342 | Guthrie | 41 46 30 N | 094 21 26 W |
| Methodist Church | Church | 341 | Hamilton | 42 23 36 N | 093 43 46 W |
| Methodist Church | Church | 346 | Harrison | 41 51 13 N | 095 36 01 W |
| Methodist Church | Church | 374 | Howard | 43 29 28 N | 092 21 36 W |
| Methodist Church | Church | 398 | Ida | 42 20 12 N | 095 20 50 W |
| Methodist Church | Church | 252 | Iowa | 41 30 55 N | 092 04 47 W |
| Methodist Church | Church | 247 | Iowa | 41 39 36 N | 092 00 31 W |
| Methodist Church | Church | 267 | Iowa | 41 34 30 N | 092 09 39 W |
| Methodist Church | Church | 225 | Iowa | 41 47 51 N | 092 04 14 W |
| Methodist Church | Church | 238 | Iowa | 41 45 17 N | 092 11 01 W |
| Methodist Church | Church | 180 | Jackson | 42 04 04 N | 090 10 24 W |
| Methodist Church | Church | 200 | Jackson | 42 03 01 N | 090 23 40 W |
| Methodist Church | Church | 244 | Jackson | 42 02 50 N | 090 18 50 W |
| Methodist Church | Church | 250 | Jones | 42 03 35 N | 091 00 23 W |
| Methodist Church | Church | 293 | Marshall | 42 06 49 N | 092 59 25 W |
| Methodist Church | Church | 364 | Mitchell | 43 22 49 N | 092 43 33 W |
| Methodist Church | Church | 214 | Muscatine | 41 35 54 N | 091 01 03 W |
| Methodist Church | Church | 480 | Osceola | 43 24 58 N | 095 32 05 W |
| Methodist Church | Church | 482 | Osceola | 43 17 14 N | 095 36 31 W |
| Methodist Church | Church | 290 | Poweshiek | 41 35 02 N | 092 31 24 W |
| Methodist Church | Church | 281 | Poweshiek | 41 44 02 N | 092 26 38 W |
| Methodist Church | Church | 349 | Ringgold | 40 36 17 N | 094 23 16 W |
| Methodist Church | Church | 366 | Ringgold | 40 42 39 N | 094 03 00 W |
| Methodist Church | Church | 438 | Sac | 42 29 53 N | 095 17 46 W |
| Methodist Church | Church | 420 | Sac | 42 18 39 N | 095 15 11 W |
| Methodist Church | Church | 435 | Sioux | 42 58 27 N | 096 19 08 W |
| Methodist Church | Church | 385 | Taylor | 40 48 03 N | 094 28 33 W |
| Methodist Church | Church | 386 | Union | 40 56 53 N | 094 13 12 W |
| Methodist Church | Church | 374 | Union | 41 01 37 N | 094 11 52 W |
| Methodist Church | Church | 202 | Washington | 41 29 03 N | 091 42 27 W |
| Methodist Church | Church | 357 | Webster | 42 15 47 N | 094 10 37 W |
| Methodist Church | Church | 388 | Winnebago | 43 22 14 N | 093 46 28 W |
| Methodist Church | Church | 351 | Wright | 42 39 32 N | 093 30 03 W |
| Methodist Church Wesley | Church | 245 | Polk | 41 35 41 N | 093 34 06 W |
| Methodist Episcopal Cemetery | Cemetery | 229 | Van Buren | 40 52 43 N | 091 56 33 W |
| Methodist Episcopal Church | Church | 385 | Guthrie | 41 31 13 N | 094 24 27 W |
| Methodist Episcopal Church | Church | 402 | Ida | 42 28 00 N | 095 39 41 W |
| Methodist Episcopal Church (historical) | Church | 351 | Ringgold | 40 37 03 N | 094 09 53 W |
| Methodist Grove Cemetery | Cemetery | 385 | Adams | 40 54 49 N | 094 50 01 W |
| Methodist Lutheran Physicians | Hospital | 252 | Polk | 41 39 50 N | 093 42 06 W |
| Methodist Lutheran Physicians Center | Hospital | 282 | Jasper | 41 35 55 N | 093 14 09 W |
| Methodist Lutheran Physicians Center | Hospital | 285 | Polk | 41 35 07 N | 093 45 04 W |
| Methodist Manor | Hospital | 427 | Buena Vista | 42 38 31 N | 095 13 01 W |
| Metier Cemetery | Cemetery | 332 | Decatur | 40 52 51 N | 093 39 02 W |
| Metro Assembly of God Church | Church | 268 | Polk | 41 37 32 N | 093 37 17 W |
| Metro High School | School | 219 | Linn | 41 58 18 N | 091 39 24 W |
| Metro West Learning Academy | School | 295 | Polk | 41 39 27 N | 093 46 39 W |
| Metropolitan Community Church | Church | 196 | Scott | 41 33 05 N | 090 34 34 W |
| Metz | Locale | 248 | Jasper | 41 39 59 N | 093 08 09 W |
| Metz | Populated Place | 248 | Jasper | 41 39 59 N | 093 08 09 W |
| Metz Community Church | Church | 237 | Jasper | 41 39 60 N | 093 08 31 W |
| Metz Creek | Stream | | Adams | 40 58 16 N | 094 30 36 W |
| Metz Post Office (historical) | Post Office | 248 | Jasper | 41 39 59 N | 093 08 09 W |
| Meyer | Populated Place | 388 | Mitchell | 43 27 28 N | 092 41 34 W |
| Meyer Cemetery | Cemetery | 338 | Clayton | 42 48 40 N | 091 26 16 W |
| Meyer Post Office (historical) | Post Office | 388 | Mitchell | 43 27 28 N | 092 41 34 W |
| Meyerholz Lake | Lake | 166 | Louisa | 41 09 09 N | 091 08 52 W |
| Meyers Family Plot | Cemetery | 171 | Des Moines | 40 52 00 N | 091 07 01 W |
| Meyers Lake | Lake | 251 | Black Hawk | 42 27 43 N | 092 17 21 W |
| MFL Mar Mac Community Schools | School | 367 | Clayton | 43 02 49 N | 091 23 30 W |
| Miami | Populated Place | 235 | Monroe | 41 08 50 N | 092 50 24 W |
| Miami Lake State Game Management Area | Area | 248 | Monroe | 41 06 55 N | 092 50 52 W |
| Michael Park | Park | 283 | Polk | 41 44 05 N | 093 35 11 W |
| Michael Schmitt Cemetery | Cemetery | 320 | Dubuque | 42 26 30 N | 090 51 00 W |
| Michaelius Honor House | Building | 267 | Marion | 41 24 12 N | 092 55 09 W |
| Michaels Creek | Stream | | Louisa | 41 14 00 N | 091 06 39 W |
| Michaelsen Marsh | Swamp | 348 | Palo Alto | 43 14 45 N | 094 05 31 W |
| Mickey Fox Wildlife Area | Park | 279 | Buchanan | 42 32 20 N | 092 03 01 W |
| Mid America Air Museum | Building | 335 | Woodbury | 42 24 35 N | 096 22 13 W |
| Mid City Park | Park | 359 | Woodbury | 42 29 57 N | 096 23 49 W |
| Mid Iowa Diagnostic Services Center | Hospital | 271 | Polk | 41 35 22 N | 093 37 59 W |
| Mid Iowa Pediatrics Center | Hospital | 340 | Webster | 42 28 19 N | 094 11 49 W |
| Mid Prairie Post Office (historical) | Post Office | 220 | Louisa | 41 07 00 N | 091 21 11 W |
| Mid River Public Use Area | Park | 237 | Johnson | 41 47 28 N | 091 38 06 W |
| Mid-Iowa Co-op Company Elevator | Locale | 300 | Grundy | 42 13 07 N | 092 49 25 W |
| Mid-Iowa Co-op Elevator | Locale | 305 | Marshall | 42 11 17 N | 093 00 26 W |
| Mid-Iowa Co-op Elevator | Locale | 290 | Marshall | 42 06 59 N | 093 09 32 W |
| Mid-Iowa Co-op Elevator | Locale | 283 | Marshall | 42 06 35 N | 092 59 38 W |
| Mid-Iowa Surgery | Hospital | 357 | Wright | 42 43 16 N | 093 44 01 W |
| Mid-Iowa Surgery Center | Hospital | 327 | Hamilton | 42 27 33 N | 093 49 25 W |
| Mid-Prairie Middle School | School | 205 | Washington | 41 29 18 N | 091 42 04 W |
| Mid-Prairie Park | Park | 378 | Carroll | 42 04 10 N | 094 53 51 W |
| Mid-Prairie Senior High School | School | 229 | Washington | 41 28 05 N | 091 49 26 W |
| Middle Amana | Populated Place | 226 | Iowa | 41 47 44 N | 091 53 59 W |
| Middle Amana Post Office | Post Office | 229 | Iowa | 41 47 40 N | 091 54 04 W |
| Middle Avery Creek | Stream | | Wapello | 41 05 52 N | 092 32 28 W |
| Middle Beaver Creek | Stream | | Boone | 41 59 23 N | 094 06 48 W |
| Middle Branch Blue Earth River | Stream | | Kossuth | 43 34 19 N | 094 06 12 W |
| Middle Branch Boone River | Stream | | Hancock | 42 54 41 N | 093 52 18 W |
| Middle Branch Buckley Creek | Stream | | Mahaska | 41 29 40 N | 092 49 23 W |
| Middle Branch One Hundred and Two River | Stream | | Taylor | 40 48 11 N | 094 48 25 W |