Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Tomes County Club Acres | Locale | 297 | Pottawattamie | 41 13 06 N | 095 50 49 W |
| Toolesboro | Populated Place | 206 | Louisa | 41 08 31 N | 091 03 44 W |
| Toolesboro Access | Locale | 165 | Louisa | 41 08 40 N | 091 03 36 W |
| Toolesboro Mounds State Preserve | Park | 176 | Louisa | 41 08 35 N | 091 03 41 W |
| Tools Chapel | Church | 271 | Jasper | 41 31 18 N | 093 01 48 W |
| Toosesboro Post Office (historical) | Post Office | 206 | Louisa | 41 08 31 N | 091 03 44 W |
| Top Line Feed and Supply Incorporated Elevator | Locale | 434 | O'Brien | 42 57 12 N | 095 46 51 W |
| Top of Iowa Co-op Elevator | Locale | 382 | Winnebago | 43 28 14 N | 093 37 04 W |
| Top of Iowa Cooperative Elevator | Locale | 389 | Winnebago | 43 25 21 N | 093 32 04 W |
| Top of Iowa Cooperative Elevator | Locale | 384 | Worth | 43 21 46 N | 093 27 11 W |
| Top of Iowa Cooperative Elevator | Locale | 368 | Worth | 43 17 02 N | 093 22 44 W |
| Topping Cemetery | Cemetery | 211 | Van Buren | 40 51 00 N | 091 53 01 W |
| Torah Post Office (historical) | Post Office | 289 | Linn | 42 14 17 N | 091 31 12 W |
| Toriver County Access | Locale | 250 | Black Hawk | 42 27 13 N | 092 16 05 W |
| Torkleson Pits Wildlife Area | Park | 364 | Hancock | 43 12 10 N | 093 31 51 W |
| Toronto | Populated Place | 220 | Clinton | 41 54 18 N | 090 51 51 W |
| Toronto (historical) | Locale | 220 | Clinton | 41 54 18 N | 090 51 51 W |
| Toronto Fire Department | Building | 220 | Clinton | 41 54 18 N | 090 51 51 W |
| Toronto Post Office | Post Office | 220 | Clinton | 41 54 18 N | 090 51 51 W |
| Torrence School | School | 191 | Lee | 40 24 32 N | 091 23 18 W |
| Tostenson Wildlife Area | Park | 363 | Worth | 43 18 50 N | 093 13 11 W |
| Total Foot Care Center | Hospital | 204 | Clinton | 41 51 33 N | 090 11 44 W |
| Total Foot Care Center | Hospital | 214 | Jackson | 42 04 10 N | 090 40 25 W |
| Touchae Park | Park | 254 | Black Hawk | 42 30 20 N | 092 20 51 W |
| Tourist Park | Park | 261 | Black Hawk | 42 32 27 N | 092 26 56 W |
| Tourist Park | Park | 375 | Cerro Gordo | 43 07 23 N | 093 23 01 W |
| Tourist Park | Park | 329 | Humboldt | 42 43 12 N | 094 13 19 W |
| Towell Avenue School | School | 296 | Page | 40 46 02 N | 095 22 49 W |
| Tower | Locale | 241 | Monroe | 41 01 22 N | 092 52 40 W |
| Tower Apartments | Building | 345 | Decatur | 40 37 06 N | 093 55 26 W |
| Tower Fields | Park | 446 | Sioux | 43 04 15 N | 096 10 46 W |
| Tower Hill | Locale | 320 | Delaware | 42 22 15 N | 091 31 12 W |
| Tower Park | Park | 297 | Polk | 41 36 50 N | 093 41 11 W |
| Tower Rock | Cliff | 341 | Hardin | 42 24 11 N | 092 55 28 W |
| Tower Station (historical) | Populated Place | 241 | Monroe | 41 01 37 N | 092 52 23 W |
| Tower Terrace Mobile Home Park | Populated Place | 260 | Linn | 42 03 33 N | 091 41 41 W |
| Towers Dining Center | Building | 273 | Black Hawk | 42 31 06 N | 092 27 44 W |
| Towhead Island | Island | 165 | Muscatine | 41 24 19 N | 091 03 14 W |
| Towhead Lake | Lake | 375 | Calhoun | 42 30 37 N | 094 49 01 W |
| Towhead Lake State Game Management Area | Park | 375 | Calhoun | 42 30 37 N | 094 49 09 W |
| Towle Cemetery | Cemetery | 345 | Franklin | 42 41 01 N | 093 10 44 W |
| Towler Cemetery | Cemetery | 269 | Wapello | 40 59 40 N | 092 37 01 W |
| Town and Country Golf Club | Locale | 302 | Grundy | 42 21 14 N | 092 46 49 W |
| Town and Country Plaza | Locale | 356 | Mitchell | 43 17 07 N | 092 47 41 W |
| Town and Country Shopping Center | Locale | 249 | Linn | 42 01 10 N | 091 37 54 W |
| Town Branch | Stream | | Van Buren | 40 44 20 N | 091 59 47 W |
| Town Clock - 108 Feet High Historical Marker | Park | 193 | Dubuque | 42 29 58 N | 090 40 00 W |
| Town Clock Plaza | Locale | 191 | Dubuque | 42 30 03 N | 090 39 58 W |
| Town Clock Plaza | Park | 193 | Dubuque | 42 29 58 N | 090 40 00 W |
| Town Engineering Building | Building | 293 | Story | 42 01 47 N | 093 39 10 W |
| Town House D | Building | 214 | Scott | 41 32 25 N | 090 34 45 W |
| Town Lake | Lake | 178 | Jackson | 42 04 51 N | 090 11 03 W |
| Town Square | Locale | 337 | Woodbury | 42 29 40 N | 096 24 22 W |
| Town Square Allergy and Asthma Center | Hospital | 210 | Johnson | 41 40 35 N | 091 34 43 W |
| Town Square Dental Care Center | Hospital | 208 | Johnson | 41 40 30 N | 091 34 43 W |
| Town Square Family Foot Care Center | Hospital | 208 | Johnson | 41 40 30 N | 091 34 43 W |
| Towne Cemetery | Cemetery | 384 | Worth | 43 28 50 N | 093 21 01 W |
| Towner Post Office (historical) | Post Office | 256 | Polk | 41 43 25 N | 093 46 51 W |
| Townhead Lake State Game Mgt Area | Park | 375 | Calhoun | 42 30 37 N | 094 49 09 W |
| Townsend Wildlife Area | Park | 240 | Cedar | 41 49 00 N | 090 57 16 W |
| Township of Adams | Civil | 287 | Dallas | 41 33 24 N | 094 04 09 W |
| Township of Adams | Civil | 300 | Delaware | 42 20 25 N | 091 32 38 W |
| Township of Adams | Civil | 232 | Keokuk | 41 28 13 N | 092 14 19 W |
| Township of Adams | Civil | 243 | Mahaska | 41 22 47 N | 092 34 55 W |
| Township of Adams | Civil | 265 | Wapello | 40 56 55 N | 092 35 19 W |
| Township of Adel | Civil | 280 | Dallas | 41 37 54 N | 093 59 27 W |
| Township of Afton | Civil | 416 | Cherokee | 42 46 31 N | 095 26 41 W |
| Township of Afton | Civil | 382 | Howard | 43 16 38 N | 092 29 44 W |
| Township of Agency | Civil | 247 | Wapello | 40 59 48 N | 092 18 51 W |
| Township of Albion | Civil | 284 | Butler | 42 35 32 N | 092 43 36 W |
| Township of Albion | Civil | 378 | Howard | 43 27 59 N | 092 08 40 W |
| Township of Alden | Civil | 359 | Hardin | 42 31 06 N | 093 24 57 W |
| Township of Allen | Civil | 372 | Harrison | 41 49 31 N | 095 51 07 W |
| Township of Allen | Civil | 240 | Polk | 41 31 32 N | 093 30 20 W |
| Township of Allen | Civil | 277 | Warren | 41 28 47 N | 093 30 20 W |
| Township of Allens Grove | Civil | 195 | Scott | 41 43 22 N | 090 43 17 W |
| Township of Allison | Civil | 452 | Lyon | 43 28 10 N | 096 16 16 W |
| Township of Allison | Civil | 457 | Osceola | 43 23 01 N | 095 26 22 W |
| Township of Amaqua | Civil | 336 | Boone | 42 05 07 N | 094 06 40 W |
| Township of America | Civil | 408 | Plymouth | 42 46 46 N | 096 09 17 W |
| Township of Amherst | Civil | 425 | Cherokee | 42 46 30 N | 095 47 53 W |
| Township of Amity | Civil | 334 | Page | 40 36 38 N | 095 05 27 W |
| Township of Amsterdam | Civil | 356 | Hancock | 42 57 06 N | 093 47 34 W |
| Township of Anderson | Civil | 314 | Mills | 41 06 35 N | 095 28 18 W |
| Township of Arcadia | Civil | 437 | Carroll | 42 04 40 N | 095 01 49 W |
| Township of Arlington | Civil | 354 | Woodbury | 42 31 13 N | 096 02 30 W |
| Township of Armstrong Grove | Civil | 380 | Emmet | 43 23 06 N | 094 30 10 W |
| Township of Ashton | Civil | 321 | Monona | 42 05 24 N | 096 05 31 W |
| Township of Athens | Civil | 353 | Ringgold | 40 41 07 N | 094 04 00 W |
| Township of Auburn | Civil | 351 | Fayette | 43 02 34 N | 091 53 46 W |
| Township of Audubon | Civil | 410 | Audubon | 41 33 40 N | 094 45 04 W |
| Township of Avery | Civil | 380 | Hancock | 42 56 49 N | 093 33 46 W |
| Township of Avery | Civil | 348 | Humboldt | 42 46 26 N | 094 22 52 W |
| Township of Badger | Civil | 345 | Webster | 42 36 14 N | 094 09 36 W |
| Township of Baker | Civil | 392 | Guthrie | 41 38 57 N | 094 34 08 W |
| Township of Baker | Civil | 430 | O'Brien | 43 02 44 N | 095 48 16 W |
| Township of Baker | Civil | 462 | Osceola | 43 18 02 N | 095 33 48 W |
| Township of Baltimore | Civil | 187 | Henry | 40 51 31 N | 091 25 58 W |
| Township of Bangor | Civil | 282 | Marshall | 42 09 48 N | 093 04 47 W |
| Township of Banks | Civil | 345 | Fayette | 42 51 52 N | 092 01 31 W |
| Township of Banner | Civil | 396 | Woodbury | 42 31 04 N | 096 09 25 W |
| Township of Barclay | Civil | 302 | Black Hawk | 42 31 02 N | 092 07 54 W |
| Township of Barnes | Civil | 411 | Buena Vista | 42 51 31 N | 095 12 54 W |
| Township of Barton | Civil | 371 | Worth | 43 23 07 N | 093 05 22 W |
| Township of Bath | Civil | 354 | Cerro Gordo | 43 02 21 N | 093 12 13 W |
| Township of Battle | Civil | 429 | Ida | 42 25 44 N | 095 36 49 W |
| Township of Bear Creek | Civil | 286 | Poweshiek | 41 44 19 N | 092 28 29 W |
| Township of Bear Grove | Civil | 364 | Cass | 41 17 19 N | 094 59 08 W |
| Township of Bear Grove | Civil | 419 | Guthrie | 41 38 56 N | 094 41 42 W |
| Township of Beaver | Civil | 305 | Boone | 41 59 26 N | 094 06 28 W |