Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jefferson School | School | 254 | Mahaska | 41 17 26 N | 092 38 50 W |
| Jefferson School | School | 291 | Monroe | 41 01 40 N | 092 48 58 W |
| Jefferson School | School | 261 | Polk | 41 33 22 N | 093 39 26 W |
| Jefferson School | School | 178 | Scott | 41 31 43 N | 090 31 24 W |
| Jefferson School | School | 218 | Scott | 41 31 50 N | 090 35 25 W |
| Jefferson School | School | 397 | Union | 41 03 45 N | 094 21 22 W |
| Jefferson School | School | 202 | Wapello | 40 59 40 N | 092 25 48 W |
| Jefferson School (historical) | School | 316 | Madison | 41 28 00 N | 094 01 01 W |
| Jefferson Senior High School | School | 324 | Greene | 42 00 07 N | 094 22 32 W |
| Jefferson Softball Park | Park | 322 | Greene | 42 00 53 N | 094 21 41 W |
| Jefferson Street Viaduct | Building | 192 | Wapello | 41 00 47 N | 092 24 45 W |
| Jefferson Telephone Company Museum | Building | 325 | Greene | 42 00 51 N | 094 22 32 W |
| Jefferson Townhall | Building | 390 | Adair | 41 27 37 N | 094 24 48 W |
| Jefferson Township Cemetery | Cemetery | 254 | Buchanan | 42 18 50 N | 091 59 36 W |
| Jeffersonville (historical) | Populated Place | 168 | Lee | 40 36 35 N | 091 26 46 W |
| Jehovah Witnesses Kingdom Hall | Church | 364 | Kossuth | 43 04 55 N | 094 12 49 W |
| Jehovah's Witness Kingdom Hall | Church | 430 | Cherokee | 42 47 41 N | 095 38 04 W |
| Jehovah's Witness Kingdom Hall | Church | 303 | Page | 40 46 05 N | 095 21 44 W |
| Jehovah's Witness Kingdom Hall | Church | 356 | Wright | 42 43 02 N | 093 43 41 W |
| Jehovah's Witness Virden Creek | Church | 260 | Black Hawk | 42 30 47 N | 092 19 60 W |
| Jehovah's Witness Woodland Congregation | Church | 202 | Des Moines | 40 46 30 N | 091 10 01 W |
| Jehovah's Witnesses | Church | 286 | Marshall | 42 01 41 N | 092 54 16 W |
| Jehovah's Witnesses Congregation | Church | 285 | Delaware | 42 28 41 N | 091 27 52 W |
| Jehovah's Witnesses Congregation | Church | 293 | Polk | 41 37 38 N | 093 42 36 W |
| Jehovah's Witnesses Congregation | Church | 253 | Polk | 41 35 55 N | 093 43 18 W |
| Jehovah's Witnesses Congregation | Church | 389 | Woodbury | 42 28 25 N | 096 19 51 W |
| Jehovah's Witnesses Congregation | Church | 378 | Woodbury | 42 29 56 N | 096 26 54 W |
| Jehovah's Witnesses Highland Park Congregation | Church | 291 | Polk | 41 40 25 N | 093 36 01 W |
| Jehovah's Witnesses Southern Hills Congregation | Church | 289 | Polk | 41 32 53 N | 093 37 16 W |
| Jehovah's Witnesses Union Park Congregation | Church | 253 | Polk | 41 36 29 N | 093 36 01 W |
| Jehovahs Spanish Christian Church | Church | 260 | Black Hawk | 42 30 47 N | 092 19 60 W |
| Jehovahs Witnesses | Church | 356 | Cass | 41 24 23 N | 095 00 03 W |
| Jehovahs Witnesses | Church | 320 | Fayette | 42 40 40 N | 091 54 49 W |
| Jehovahs Witnesses | Church | 314 | Floyd | 43 03 40 N | 092 41 13 W |
| Jehovahs Witnesses | Church | 301 | Lucas | 41 00 51 N | 093 19 01 W |
| Jehovahs Witnesses | Church | 248 | Mahaska | 41 17 10 N | 092 38 46 W |
| Jehovahs Witnesses | Church | 269 | Marion | 41 27 52 N | 093 02 09 W |
| Jehovahs Witnesses | Church | 315 | Montgomery | 41 00 20 N | 095 13 59 W |
| Jehovahs Witnesses | Church | 298 | Pottawattamie | 41 14 08 N | 095 51 31 W |
| Jehovahs Witnesses | Church | 256 | Wapello | 41 03 36 N | 092 25 11 W |
| Jehovahs Witnesses | Church | 195 | Wapello | 40 59 53 N | 092 24 39 W |
| Jehovahs Witnesses Cedar Valley Kingdom Hall | Church | 256 | Linn | 41 57 47 N | 091 44 49 W |
| Jehovahs Witnesses Church | Church | 210 | Des Moines | 40 49 28 N | 091 08 52 W |
| Jehovahs Witnesses Congregation | Church | 180 | Clinton | 41 50 06 N | 090 12 43 W |
| Jehovahs Witnesses Congregation | Church | 209 | Clinton | 41 49 11 N | 090 31 52 W |
| Jehovahs Witnesses Congregation | Church | 297 | Dubuque | 42 28 43 N | 091 06 50 W |
| Jehovahs Witnesses Congregation | Church | 229 | Johnson | 41 39 00 N | 091 33 55 W |
| Jehovahs Witnesses Congregation | Church | 208 | Scott | 41 32 10 N | 090 31 18 W |
| Jehovahs Witnesses Hall | Church | 369 | Crawford | 42 00 20 N | 095 21 13 W |
| Jehovahs Witnesses Kingdom Hall | Church | 436 | Buena Vista | 42 38 34 N | 095 11 24 W |
| Jehovahs Witnesses Kingdom Hall | Church | 279 | Butler | 42 42 51 N | 092 34 48 W |
| Jehovahs Witnesses Kingdom Hall | Church | 351 | Cerro Gordo | 43 08 55 N | 093 16 01 W |
| Jehovahs Witnesses Kingdom Hall | Church | 405 | Clay | 43 09 19 N | 095 09 50 W |
| Jehovahs Witnesses Kingdom Hall | Church | 202 | Clayton | 42 44 31 N | 091 15 43 W |
| Jehovahs Witnesses Kingdom Hall | Church | 237 | Clayton | 42 50 24 N | 091 24 25 W |
| Jehovahs Witnesses Kingdom Hall | Church | 370 | Hancock | 43 05 58 N | 093 35 56 W |
| Jehovahs Witnesses McCloud Springs Kingdom Hall | Church | 233 | Linn | 42 00 06 N | 091 39 48 W |
| Jehovahs Witnesses North Congregation | Church | 203 | Clinton | 41 53 17 N | 090 10 33 W |
| Jehovahs Witnesses Pioneer Avenue Congregation Kingdom Hall | Church | 247 | Linn | 41 58 30 N | 091 32 31 W |
| Jehovahs Witnessess Kingdom Hall | Church | 355 | Chickasaw | 43 03 41 N | 092 18 55 W |
| Jehu | Locale | 317 | Boone | 41 56 10 N | 093 55 58 W |
| Jehu Post Office (historical) | Post Office | 317 | Boone | 41 56 10 N | 093 55 58 W |
| Jemmerson Slough | Gut | 434 | Dickinson | 43 26 07 N | 095 07 27 W |
| Jemmerson Slough Wildlife Management Area | Park | 436 | Dickinson | 43 25 59 N | 095 08 16 W |
| Jenison-Meacham Memorial Art Center and Museum | Building | 363 | Wright | 42 52 28 N | 093 37 01 W |
| Jenkins Cemetery | Cemetery | 314 | Clayton | 42 54 00 N | 091 14 30 W |
| Jenkins Cemetery | Cemetery | 311 | Dallas | 41 41 31 N | 094 02 53 W |
| Jenkins Township Cemetery | Cemetery | 376 | Mitchell | 43 22 05 N | 092 33 31 W |
| Jenn Timber Park | Park | 344 | Chickasaw | 43 04 02 N | 092 26 08 W |
| Jennie Edmundson Hospital | Hospital | 326 | Pottawattamie | 41 16 06 N | 095 50 03 W |
| Jennie Edmundson Physical Therapy Center | Hospital | 299 | Mills | 41 02 29 N | 095 44 36 W |
| Jennings Court | Building | 275 | Black Hawk | 42 30 27 N | 092 27 12 W |
| Jensen Elementary School | School | 293 | Polk | 41 38 15 N | 093 42 15 W |
| Jenson Hall of Music | Building | 289 | Winneshiek | 43 18 40 N | 091 48 05 W |
| Jericho Hills Campground | Locale | 303 | Lucas | 41 02 15 N | 093 27 26 W |
| Jerico | Populated Place | 348 | Chickasaw | 43 11 05 N | 092 15 31 W |
| Jerico Lutheran Cemetery | Cemetery | 348 | Chickasaw | 43 11 06 N | 092 15 26 W |
| Jerico Post Office (historical) | Post Office | 348 | Chickasaw | 43 11 05 N | 092 15 31 W |
| Jerico Wildlife Area | Park | 354 | Chickasaw | 43 11 50 N | 092 15 31 W |
| Jerome | Locale | 316 | Appanoose | 40 43 13 N | 093 01 46 W |
| Jerome | Populated Place | 313 | Appanoose | 40 43 08 N | 093 01 42 W |
| Jerome Cemetery | Cemetery | 313 | Appanoose | 40 43 01 N | 093 02 08 W |
| Jerome Post Office (historical) | Post Office | 313 | Appanoose | 40 43 08 N | 093 01 42 W |
| Jerry Rabiner Boys Home | School | 337 | Webster | 42 32 07 N | 094 15 18 W |
| Jerusalem Cemetery | Cemetery | 387 | Union | 41 06 53 N | 094 18 29 W |
| Jerusalem Church | Church | 395 | Union | 41 06 53 N | 094 17 06 W |
| Jerusalem Temple Apostolic Church | Church | 174 | Scott | 41 31 21 N | 090 35 46 W |
| Jess Branch | Stream | | Jackson | 42 09 17 N | 090 32 57 W |
| Jesse James Historical Park | Park | 440 | Adair | 41 29 50 N | 094 39 16 W |
| Jessen Farm Cemetery | Cemetery | 208 | Jackson | 42 04 33 N | 090 35 18 W |
| Jessen Farm Cemetery | Cemetery | 210 | Jackson | 42 04 34 N | 090 35 19 W |
| Jessie Field Shambaugh State Historical Marker | Park | 304 | Page | 40 44 18 N | 095 01 21 W |
| Jessop-Bruner Library | Building | 249 | Mahaska | 41 17 13 N | 092 37 07 W |
| Jessup Hall | Building | 211 | Johnson | 41 39 43 N | 091 32 11 W |
| Jester Park | Park | 284 | Polk | 41 47 15 N | 093 46 57 W |
| Jester Park Golf Course | Locale | 297 | Polk | 41 46 45 N | 093 47 01 W |
| Jesup | Locale | 298 | Buchanan | 42 28 28 N | 092 03 43 W |
| Jesup | Populated Place | 300 | Buchanan | 42 28 32 N | 092 03 50 W |
| Jesup City Hall | Building | 299 | Buchanan | 42 28 32 N | 092 03 48 W |
| Jesup Clinic | Hospital | 291 | Buchanan | 42 28 04 N | 092 03 25 W |
| Jesup Fire Department | Building | 300 | Buchanan | 42 28 35 N | 092 03 53 W |
| Jesup High School | School | 305 | Buchanan | 42 28 52 N | 092 03 52 W |
| Jesup Police Department | Building | 299 | Buchanan | 42 28 32 N | 092 03 49 W |
| Jesup Post Office | Post Office | 298 | Buchanan | 42 28 30 N | 092 03 41 W |
| Jesup Public Library | Building | 299 | Buchanan | 42 28 32 N | 092 03 49 W |
| Jesus Christ Apostolic Church | Church | 259 | Polk | 41 36 04 N | 093 35 37 W |
| Jesus Christ Apostolic Temple | Church | 212 | Des Moines | 40 47 20 N | 091 06 12 W |
| Jesus is the Answer Fellowship | Church | 198 | Wapello | 40 59 34 N | 092 25 03 W |
| Jesus Only Church of Christ | Church | 218 | Henry | 40 58 43 N | 091 33 16 W |
| Jewel Park | Park | 332 | Woodbury | 42 23 39 N | 096 21 27 W |