Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Middle Branch Wapsinonoc Creek | Stream | | Muscatine | 41 34 31 N | 091 14 60 W |
| Middle Buck Creek | Stream | | Poweshiek | 41 33 13 N | 092 38 03 W |
| Middle Creek | Stream | | Mahaska | 41 20 36 N | 092 26 28 W |
| Middle Creek | Stream | | Warren | 41 29 10 N | 093 06 04 W |
| Middle Decature Bend | Bend | 316 | Monona | 42 00 24 N | 096 14 31 W |
| Middle English River | Stream | | Iowa | 41 32 33 N | 092 01 59 W |
| Middle Fork Catfish Creek | Stream | | Dubuque | 42 28 11 N | 090 40 38 W |
| Middle Fork Cemetery | Cemetery | 331 | Ringgold | 40 35 46 N | 094 19 02 W |
| Middle Fork Church | Church | 330 | Ringgold | 40 35 47 N | 094 19 03 W |
| Middle Fork Little Maquoketa River | Stream | | Dubuque | 42 34 08 N | 090 48 18 W |
| Middle Fork Medicine Creek | Stream | | Wayne | 40 35 47 N | 093 21 21 W |
| Middle Fork One Hundred and Two River | Stream | | Taylor | 40 33 29 N | 094 49 27 W |
| Middle Fork South Beaver Creek | Stream | | Grundy | 42 29 56 N | 092 51 36 W |
| Middle Junior High School | School | 279 | Buchanan | 42 28 01 N | 091 54 33 W |
| Middle Mill Creek | Stream | | Page | 40 36 24 N | 095 06 37 W |
| Middle Minerva Creek | Stream | | Marshall | 42 07 19 N | 093 08 44 W |
| Middle Nodaway River | Stream | | Montgomery | 40 54 17 N | 094 59 55 W |
| Middle Otter Creek | Stream | | Clarke | 41 07 09 N | 093 38 31 W |
| Middle Platte River | Stream | | Taylor | 40 53 00 N | 094 26 06 W |
| Middle Pond | Lake | 233 | Iowa | 41 48 30 N | 091 54 26 W |
| Middle Raccoon River | Stream | | Dallas | 41 34 20 N | 094 11 42 W |
| Middle Raccoon River Access | Locale | 299 | Guthrie | 41 38 55 N | 094 19 41 W |
| Middle Racoon River Access | Locale | 398 | Carroll | 41 54 55 N | 094 45 03 W |
| Middle River | Stream | | Warren | 41 28 57 N | 093 24 07 W |
| Middle River Cemetery | Cemetery | 273 | Warren | 41 28 10 N | 093 27 47 W |
| Middle River Church | Church | 275 | Warren | 41 28 07 N | 093 27 49 W |
| Middle River County Forest | Forest | 330 | Adair | 41 21 06 N | 094 16 36 W |
| Middle River Post Office (historical) | Post Office | 336 | Madison | 41 19 45 N | 094 13 58 W |
| Middle River School | Locale | 289 | Madison | 41 18 22 N | 094 01 58 W |
| Middle Road Park | Park | 181 | Scott | 41 32 33 N | 090 30 04 W |
| Middle Silver Creek | Stream | | Pottawattamie | 41 09 59 N | 095 35 42 W |
| Middle Slough | Channel | 189 | Allamakee | 43 23 45 N | 091 13 48 W |
| Middle Soldier River | Stream | | Monona | 42 02 57 N | 095 40 33 W |
| Middle Timber Creek | Stream | | Marshall | 41 58 47 N | 092 53 35 W |
| Middle Walnut Creek | Stream | | Jefferson | 41 06 33 N | 091 53 04 W |
| Middle Willow Creek | Stream | | Crawford | 41 57 48 N | 095 40 05 W |
| Middleburg | Populated Place | 428 | Sioux | 43 06 49 N | 096 04 08 W |
| Middleburg Cemetery | Cemetery | 417 | Sioux | 43 06 37 N | 096 04 39 W |
| Middleburg Cemetery | Cemetery | 232 | Washington | 41 29 27 N | 091 39 42 W |
| Middleburg Free Grace Reformed Church | Church | 427 | Sioux | 43 06 51 N | 096 04 14 W |
| Middleburg Post Office (historical) | Post Office | 428 | Sioux | 43 06 49 N | 096 04 08 W |
| Middleburg Post Office (historical) | Post Office | 225 | Washington | 41 29 26 N | 091 39 31 W |
| Middleburg School | School | 216 | Washington | 41 29 26 N | 091 39 26 W |
| Middlefield (historical) | Locale | 311 | Buchanan | 42 25 42 N | 091 41 11 W |
| Middlefield Post Office (historical) | Post Office | 318 | Buchanan | 42 24 20 N | 091 41 31 W |
| Middlekoop Landing Strip | Airport | 240 | Jefferson | 41 05 18 N | 092 03 17 W |
| Middleport Post Office (historical) | Post Office | 318 | Clarke | 41 06 00 N | 093 35 11 W |
| Middleton Cemetery | Cemetery | 230 | Washington | 41 17 10 N | 091 52 51 W |
| Middleton City Hall | Building | 222 | Des Moines | 40 49 40 N | 091 15 31 W |
| Middleton Post Office | Post Office | 222 | Des Moines | 40 49 40 N | 091 15 31 W |
| Middletown | Locale | 222 | Des Moines | 40 49 50 N | 091 15 46 W |
| Middletown | Populated Place | 220 | Des Moines | 40 49 42 N | 091 15 33 W |
| Middletown Cemetery | Cemetery | 219 | Des Moines | 40 50 05 N | 091 15 40 W |
| Midland | Populated Place | 437 | Lyon | 43 28 35 N | 096 06 01 W |
| Midland Cemetery | Cemetery | 307 | Jones | 42 07 17 N | 091 12 09 W |
| Midland Community School | School | 250 | Jones | 42 03 40 N | 091 00 26 W |
| Midland Community School | School | 229 | Jones | 41 59 19 N | 090 57 13 W |
| Midland Evangelical Free Church | Church | 322 | Pottawattamie | 41 16 48 N | 095 46 11 W |
| Midland Intermediate School | School | 230 | Jones | 41 59 10 N | 090 57 15 W |
| Midland Middle School | School | 226 | Clinton | 41 57 38 N | 090 48 56 W |
| Midland Post Office (historical) | Post Office | 299 | Hardin | 42 15 05 N | 093 09 59 W |
| Midland Post Office (historical) | Post Office | 305 | Tama | 42 17 30 N | 092 24 01 W |
| Midland School | School | 244 | Jackson | 42 04 44 N | 090 52 43 W |
| Midland Townhall | Building | 436 | Lyon | 43 26 52 N | 096 02 19 W |
| Midlands Clinic Hearing Services | Hospital | 437 | Sioux | 43 00 35 N | 096 03 31 W |
| Midlands Dental Center | Hospital | 335 | Harrison | 41 44 22 N | 095 42 07 W |
| Midlands Dental Center | Hospital | 304 | Pottawattamie | 41 15 35 N | 095 51 09 W |
| Midtown Dental Clinic | Hospital | 364 | Woodbury | 42 30 09 N | 096 24 19 W |
| Midtown Medical Clinic | Hospital | 364 | Woodbury | 42 30 09 N | 096 24 19 W |
| Midvale | Populated Place | 302 | Story | 41 55 46 N | 093 36 37 W |
| Midway | Populated Place | 308 | Floyd | 43 00 19 N | 092 36 20 W |
| Midway | Populated Place | 256 | Linn | 42 06 22 N | 091 41 49 W |
| Midway | Populated Place | 444 | Woodbury | 42 22 15 N | 095 43 44 W |
| Midway (historical) | Locale | 209 | Johnson | 41 37 08 N | 091 26 21 W |
| Midway (historical) | Populated Place | 209 | Johnson | 41 37 08 N | 091 26 21 W |
| Midway Beach | Populated Place | 174 | Muscatine | 41 27 33 N | 090 49 43 W |
| Midway Church | Church | 256 | Davis | 40 51 35 N | 092 23 52 W |
| Midway County Park | Park | 359 | Woodbury | 42 32 22 N | 096 01 52 W |
| Midway Mall | Locale | 287 | Black Hawk | 42 30 23 N | 092 24 04 W |
| Midway Park | Park | 361 | Woodbury | 42 32 22 N | 096 01 43 W |
| Midway Post Office (historical) | Post Office | 284 | Polk | 41 34 20 N | 093 25 01 W |
| Midway Post Office (historical) | Post Office | 444 | Woodbury | 42 22 15 N | 095 43 44 W |
| Midway Trailer Court | Populated Place | 294 | Buchanan | 42 28 05 N | 092 03 16 W |
| Midwest Church of God | Church | 299 | Pottawattamie | 41 15 23 N | 095 53 02 W |
| Midwest Country Estates | Populated Place | 316 | Dallas | 41 36 45 N | 093 52 01 W |
| Midwest Eye Care Center | Hospital | 321 | Pottawattamie | 41 16 03 N | 095 50 31 W |
| Midwest Eye Care Center | Hospital | 381 | Shelby | 41 38 48 N | 095 19 34 W |
| Midwest Eyecare Center | Hospital | 358 | Montgomery | 41 01 38 N | 095 12 53 W |
| Midwest Farmers Co-op Association Elevator | Locale | 402 | Sioux | 42 57 59 N | 096 10 50 W |
| Midwest Farmers Co-op Elevator | Locale | 427 | Sioux | 43 14 38 N | 095 56 07 W |
| Midwest Farmers Cooperative Elevator | Locale | 398 | Sioux | 42 59 20 N | 096 00 25 W |
| Midwest Health and Wellness Center | Hospital | 352 | Monona | 42 09 35 N | 095 47 32 W |
| Midwest Medical Center | Hospital | 366 | Cass | 41 24 14 N | 094 59 51 W |
| Midwest Old Settlers and Threshers Park | Park | 218 | Henry | 40 57 10 N | 091 33 19 W |
| Midwest Old Threshers Heritage Museum | Building | 220 | Henry | 40 57 18 N | 091 32 51 W |
| Midwest Pain Management Center | Hospital | 325 | Pottawattamie | 41 16 05 N | 095 50 24 W |
| Midwest Pathology Specialists Center | Hospital | 327 | Pottawattamie | 41 16 09 N | 095 50 21 W |
| Midwest Therapeutic Clinic | Hospital | 224 | Wapello | 40 59 42 N | 092 26 46 W |
| Midwest Urology Associates Center | Hospital | 397 | Carroll | 42 03 24 N | 094 51 59 W |
| Midwest Urology Center | Hospital | 360 | Harrison | 41 33 45 N | 095 53 08 W |
| Midwest Womens Health Care Center | Hospital | 325 | Pottawattamie | 41 16 05 N | 095 50 24 W |
| Miedema Chiropractic Clinic | Hospital | 437 | O'Brien | 43 10 50 N | 095 51 11 W |
| Mifford Consolidated School | School | 303 | Story | 42 04 44 N | 093 31 16 W |
| Mike Macke Memorial Park | Park | 378 | Calhoun | 42 16 03 N | 094 44 02 W |
| Mike Mickelson Park | Park | 384 | Emmet | 43 24 00 N | 094 50 41 W |
| Mike Zack Wildlife Area | Park | 368 | Cerro Gordo | 43 06 05 N | 093 11 06 W |
| Mikesell Cemetery | Cemetery | 252 | Marion | 41 26 40 N | 093 05 31 W |
| Mikesville Post Office (historical) | Post Office | 357 | Hancock | 42 55 22 N | 093 50 01 W |
| Mikkelson Park | Park | 352 | Chickasaw | 43 03 28 N | 092 17 59 W |
| Milan (historical) | Locale | 254 | Keokuk | 41 25 25 N | 092 21 38 W |