Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lucky Valley Cemetery | Cemetery | 383 | Woodbury | 42 22 54 N | 095 56 31 W |
| Luckyvalley Post Office (historical) | Post Office | 369 | Woodbury | 42 23 06 N | 095 55 51 W |
| Ludlow | Populated Place | 367 | Allamakee | 43 13 35 N | 091 34 01 W |
| Ludlow Post Office (historical) | Post Office | 367 | Allamakee | 43 13 35 N | 091 34 01 W |
| Ludwig County Park | Park | 346 | Winneshiek | 43 12 52 N | 092 03 50 W |
| Ludwig Reserve | Park | 325 | Winneshiek | 43 11 60 N | 091 58 51 W |
| Luella Post Office (historical) | Post Office | 385 | Pocahontas | 42 49 15 N | 094 44 60 W |
| Luers Park | Park | 204 | Des Moines | 40 49 30 N | 091 09 01 W |
| Luicks Creek | Stream | | Wright | 42 49 50 N | 093 36 33 W |
| Luke Rossiter Wildlife Area | Park | 372 | Winnebago | 43 20 45 N | 093 49 52 W |
| Lull's Park | Park | 351 | Allamakee | 43 05 00 N | 091 33 35 W |
| Lum Hollow Creek | Stream | | Woodbury | 42 16 13 N | 096 03 12 W |
| Lund Creek | Stream | | Ida | 42 18 16 N | 095 36 14 W |
| Lundgren | Populated Place | 348 | Webster | 42 22 07 N | 094 10 29 W |
| Lundgren (historical) | Locale | 348 | Webster | 42 22 07 N | 094 10 29 W |
| Lundgren Church Nature Park | Park | 347 | Webster | 42 21 60 N | 094 10 11 W |
| Lundgren Post Office (historical) | Post Office | 348 | Webster | 42 22 07 N | 094 10 29 W |
| Lundy Acres | Park | 244 | Warren | 41 25 10 N | 093 35 21 W |
| Lundys Creek | Stream | | Boone | 42 07 00 N | 093 43 04 W |
| Lunni Post Office (historical) | Post Office | 340 | Wright | 42 51 51 N | 093 56 36 W |
| Lunsford | Populated Place | 273 | Davis | 40 36 10 N | 092 26 08 W |
| Lunsford Post Office (historical) | Post Office | 273 | Davis | 40 36 10 N | 092 26 08 W |
| Luray | Populated Place | 287 | Marshall | 41 59 26 N | 092 59 60 W |
| Luray (historical) | Locale | 287 | Marshall | 41 59 25 N | 092 59 59 W |
| Luray Post Office (historical) | Post Office | 287 | Marshall | 41 59 25 N | 092 59 59 W |
| Lush Auditorium | Building | 284 | Story | 42 01 45 N | 093 38 36 W |
| Luster Heights Prison Farm | Locale | 302 | Allamakee | 43 08 20 N | 091 11 08 W |
| Lutes Creek | Stream | | Marshall | 41 55 06 N | 092 52 46 W |
| Luther | Populated Place | 333 | Boone | 41 58 04 N | 093 49 08 W |
| Luther (historical) | Locale | 333 | Boone | 41 58 04 N | 093 49 08 W |
| Luther College | School | 287 | Winneshiek | 43 18 45 N | 091 48 18 W |
| Luther College Observatory | Locale | 374 | Winneshiek | 43 24 15 N | 091 47 09 W |
| Luther College Tennis Courts | Park | 274 | Winneshiek | 43 18 32 N | 091 48 23 W |
| Luther Hall | Building | 283 | Bremer | 42 43 40 N | 092 28 53 W |
| Luther Manor | Hospital | 264 | Dubuque | 42 30 15 N | 090 42 56 W |
| Luther Memorial Church | Church | 264 | Polk | 41 37 13 N | 093 36 16 W |
| Luther Post Office | Post Office | 333 | Boone | 41 58 04 N | 093 49 08 W |
| Lutheran Campus Ministry | Church | 216 | Johnson | 41 39 50 N | 091 32 06 W |
| Lutheran Cemetery | Cemetery | 240 | Allamakee | 43 17 52 N | 091 19 27 W |
| Lutheran Cemetery | Cemetery | 287 | Benton | 41 53 57 N | 092 11 07 W |
| Lutheran Cemetery | Cemetery | 336 | Chickasaw | 43 03 50 N | 092 08 42 W |
| Lutheran Cemetery | Cemetery | 252 | Keokuk | 41 24 36 N | 092 17 50 W |
| Lutheran Cemetery | Cemetery | 368 | Kossuth | 43 25 06 N | 094 21 16 W |
| Lutheran Cemetery | Cemetery | 396 | Palo Alto | 43 10 11 N | 094 30 28 W |
| Lutheran Cemetery | Cemetery | 405 | Winneshiek | 43 28 58 N | 091 46 04 W |
| Lutheran Cemetery | Church | 281 | Winneshiek | 43 17 57 N | 091 46 36 W |
| Lutheran Chapel of Saint James German (historical) | Church | 333 | Winneshiek | 43 08 44 N | 091 56 23 W |
| Lutheran Church | Church | 405 | Cass | 41 26 54 N | 094 45 50 W |
| Lutheran Church | Church | 312 | Grundy | 42 21 46 N | 092 46 42 W |
| Lutheran Church | Church | 280 | Jasper | 41 34 42 N | 092 50 42 W |
| Lutheran Church | Church | 274 | Jasper | 41 43 02 N | 092 54 17 W |
| Lutheran Church | Church | 249 | Jones | 42 03 35 N | 091 00 33 W |
| Lutheran Church | Church | 228 | Jones | 41 59 54 N | 091 08 39 W |
| Lutheran Church | Church | 250 | Keokuk | 41 10 21 N | 092 18 32 W |
| Lutheran Church | Church | 383 | Sac | 42 18 24 N | 095 03 12 W |
| Lutheran Church | Church | 373 | Sac | 42 25 25 N | 094 51 39 W |
| Lutheran Church | Church | 357 | Wright | 42 44 06 N | 093 44 03 W |
| Lutheran Church East Side | Church | 189 | Scott | 41 31 41 N | 090 33 39 W |
| Lutheran Church of Galva | Church | 406 | Ida | 42 30 14 N | 095 25 09 W |
| Lutheran Church West | Church | 258 | Fayette | 43 00 07 N | 091 39 11 W |
| Lutheran Emanuel Cemetery | Cemetery | 377 | Sac | 42 22 09 N | 094 52 39 W |
| Lutheran Interparish School | School | 253 | Iowa | 41 39 28 N | 092 00 34 W |
| Lutheran Lakeside Camp | Locale | 430 | Dickinson | 43 23 52 N | 095 05 46 W |
| Lutheran Retirement Home | Hospital | 374 | Worth | 43 27 07 N | 093 13 08 W |
| Lutherische Kirche | Locale | 384 | Mills | 41 09 20 N | 095 45 47 W |
| Luton | Populated Place | 329 | Woodbury | 42 20 23 N | 096 13 35 W |
| Luton (historical) | Locale | 329 | Woodbury | 42 20 20 N | 096 13 31 W |
| Luton Post Office (historical) | Post Office | 329 | Woodbury | 42 20 23 N | 096 13 35 W |
| Lutton Cemetery | Cemetery | 261 | Keokuk | 41 29 47 N | 092 08 04 W |
| Luverne Township Cemetery | Cemetery | 351 | Kossuth | 42 54 57 N | 094 04 16 W |
| Lux Creek | Stream | | Jackson | 42 21 32 N | 090 32 24 W |
| Luxemburg | Populated Place | 358 | Dubuque | 42 36 10 N | 091 04 26 W |
| Luxemburg City Hall | Building | 357 | Dubuque | 42 36 10 N | 091 04 24 W |
| Luxwmburg Post Office | Post Office | 357 | Dubuque | 42 36 09 N | 091 04 23 W |
| Luzerne | Locale | 274 | Benton | 41 54 20 N | 092 10 48 W |
| Luzerne | Populated Place | 286 | Benton | 41 53 53 N | 092 10 48 W |
| Luzerne Post Office | Post Office | 274 | Benton | 41 54 20 N | 092 10 48 W |
| Lycurgus | Populated Place | 387 | Allamakee | 43 19 52 N | 091 25 26 W |
| Lycurgus Cemetery | Cemetery | 380 | Allamakee | 43 19 57 N | 091 25 26 W |
| Lycurgus Post Office (historical) | Post Office | 387 | Allamakee | 43 19 50 N | 091 25 26 W |
| Lycurgus School (historical) | School | 311 | Allamakee | 42 19 56 N | 091 25 14 W |
| Lyla Marsh | Reservoir | 361 | Howard | 43 17 06 N | 092 28 07 W |
| Lyla Marsh Dam | Dam | 361 | Howard | 43 17 06 N | 092 28 07 W |
| Lylahs Marsh County Park | Park | 362 | Howard | 43 17 10 N | 092 28 03 W |
| Lyle Retz Memorial County Park | Park | 269 | Delaware | 42 23 35 N | 091 19 01 W |
| Lyman | Populated Place | 392 | Cass | 41 13 52 N | 094 59 04 W |
| Lyman Post Office (historical) | Post Office | 392 | Cass | 41 13 52 N | 094 59 04 W |
| Lyndale | Populated Place | 222 | Allamakee | 43 17 56 N | 091 17 00 W |
| Lyndale Post Office (historical) | Post Office | 222 | Allamakee | 43 17 56 N | 091 17 00 W |
| Lynn Creek | Stream | | Henry | 41 00 59 N | 091 34 52 W |
| Lynn Post Office (historical) | Post Office | 296 | Warren | 41 24 43 N | 093 43 41 W |
| Lynnville | Populated Place | 253 | Jasper | 41 34 39 N | 092 47 01 W |
| Lynnville (historical) | Locale | 249 | Jasper | 41 34 45 N | 092 46 58 W |
| Lynnville City Hall | Building | 249 | Jasper | 41 34 45 N | 092 46 58 W |
| Lynnville Fire Department | Building | 249 | Jasper | 41 34 45 N | 092 46 58 W |
| Lynnville Library | Building | 249 | Jasper | 41 34 45 N | 092 46 58 W |
| Lynnville Medical Clinic | Hospital | 249 | Jasper | 41 34 45 N | 092 46 58 W |
| Lynnville Post Office | Post Office | 250 | Jasper | 41 34 42 N | 092 46 58 W |
| Lynnville-Sully School | School | 278 | Jasper | 41 34 54 N | 092 50 32 W |
| Lynwood Cemetery | Cemetery | 285 | Butler | 42 47 00 N | 092 40 53 W |
| Lyon County | Civil | 438 | Lyon | 43 23 00 N | 096 15 03 W |
| Lyon County Courthouse | Building | 412 | Lyon | 43 25 48 N | 096 10 03 W |
| Lyon County Fairgrounds | Locale | 406 | Lyon | 43 25 37 N | 096 09 41 W |
| Lyon County First Presbyterian Church Cemetery | Cemetery | 439 | Lyon | 43 18 60 N | 095 58 13 W |
| Lyon County Historical Society Museum Complex | Building | 409 | Lyon | 43 25 58 N | 096 10 03 W |
| Lyon County Sheriffs Office | Building | 411 | Lyon | 43 25 42 N | 096 10 09 W |
| Lyon Hall | Building | 283 | Story | 42 01 25 N | 093 38 31 W |
| Lyon Manor Care Center | Hospital | 418 | Lyon | 43 25 14 N | 096 10 31 W |
| Lyons | Populated Place | 198 | Clinton | 41 52 02 N | 090 11 10 W |
| Lyons (historical) | Locale | 198 | Clinton | 41 52 02 N | 090 11 10 W |