Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jambo Creek Cemetery | Cemetery | 214 | Manitowoc | 44 16 16 N | 087 40 48 W |
| Jambo Creek Park | Park | 199 | Manitowoc | 44 15 53 N | 087 40 51 W |
| Jambo Creek School (historical) | School | 201 | Manitowoc | 44 15 53 N | 087 40 47 W |
| James Island | Island | 226 | Winnebago | 44 11 60 N | 088 27 50 W |
| James Lake | Lake | 503 | Oneida | 45 44 14 N | 089 06 39 W |
| James Lake | Lake | 400 | Sawyer | 45 56 28 N | 091 08 36 W |
| James Lake | Lake | 521 | Taylor | 45 21 21 N | 090 13 39 W |
| James Madison Elementary School | School | 202 | Sheboygan | 43 44 17 N | 087 44 10 W |
| James Madison Park | Park | 260 | Dane | 43 04 50 N | 089 23 03 W |
| James Otis School | School | 247 | Fond du Lac | 43 45 48 N | 088 30 11 W |
| James Slough | Lake | 400 | Sawyer | 45 53 36 N | 091 12 59 W |
| James Vincent House | Building | 207 | La Crosse | 43 48 31 N | 091 14 30 W |
| James Williams Junior High School | School | 476 | Oneida | 45 38 51 N | 089 23 39 W |
| Jamestown | Populated Place | 283 | Grant | 42 35 16 N | 090 32 54 W |
| Jamestown Cemetery | Cemetery | 301 | Grant | 42 34 51 N | 090 32 46 W |
| Jamesville School | School | 363 | Iowa | 42 58 04 N | 090 10 19 W |
| Jamison Museum | Building | 293 | Grant | 42 43 57 N | 090 28 18 W |
| Jana Airport | Airport | 257 | Dane | 42 52 22 N | 089 04 32 W |
| Janacek Springs | Spring | 451 | Price | 45 43 59 N | 090 27 47 W |
| Janes Bay | Bay | 424 | Bayfield | 46 12 27 N | 091 04 15 W |
| Janes Elementary School | School | 189 | Racine | 42 44 21 N | 087 47 09 W |
| Janes Spur School (historical) | School | 446 | Lincoln | 45 15 53 N | 089 26 45 W |
| Janesville | Populated Place | 257 | Rock | 42 40 58 N | 089 01 07 W |
| Janesville Bible Baptist Temple | Church | 257 | Rock | 42 39 19 N | 089 02 29 W |
| Janesville Central 1855c353 Dam | Dam | 235 | Rock | 42 41 06 N | 089 01 36 W |
| Janesville City Hall | Building | 241 | Rock | 42 40 56 N | 089 01 37 W |
| Janesville Country Club | Locale | 281 | Rock | 42 41 40 N | 089 03 18 W |
| Janesville Mall Shopping Center | Locale | 269 | Rock | 42 42 42 N | 088 59 55 W |
| Janesville Medical Center | Hospital | 262 | Rock | 42 41 56 N | 088 58 28 W |
| Janesville Post Office | Post Office | 257 | Rock | 42 40 58 N | 089 01 07 W |
| Janesville Public Library | Building | 236 | Rock | 42 40 44 N | 089 01 08 W |
| Janesville School (historical) | School | 345 | Clark | 44 42 44 N | 090 39 06 W |
| Janke WP 445 Dam | Dam | 258 | Jackson | 44 11 06 N | 090 44 30 W |
| Jankewitz Lake | Lake | 502 | Iron | 46 12 59 N | 090 07 19 W |
| Jansen Cemetery | Cemetery | 227 | Sheboygan | 43 39 11 N | 087 52 18 W |
| Janssen Elementary School | School | 217 | Outagamie | 44 16 01 N | 088 18 26 W |
| Jaquet Lake | Lake | 462 | Florence | 45 47 24 N | 088 37 28 W |
| Jargo School | School | 278 | Dane | 43 02 60 N | 089 08 58 W |
| Jarvis Hall | Building | 261 | Dunn | 44 52 23 N | 091 55 31 W |
| Jarvis Valley | Valley | | Richland | 43 22 31 N | 090 26 36 W |
| Javorsky Creek | Stream | | Iron | 46 22 03 N | 090 30 25 W |
| Jay Creek | Stream | | Monroe | 44 06 27 N | 090 25 22 W |
| Jay Creek Pine Forest State Natural Area | Park | 44 | Jackson | 44 10 50 N | 090 30 05 W |
| Jaycee Park | Park | 284 | Dane | 42 55 40 N | 089 22 26 W |
| Jean Lake | Lake | 521 | Vilas | 46 05 19 N | 089 26 59 W |
| Jeanette Adams Municipal Swimming Pool | Park | 276 | Dodge | 43 33 55 N | 088 54 11 W |
| Jeannie Lake | Lake | 506 | Iron | 46 17 28 N | 089 57 49 W |
| Jeanstow Lake | Lake | 334 | Chippewa | 45 13 10 N | 091 25 32 W |
| Jeff Davis Rock | Pillar | 398 | Monroe | 43 54 22 N | 090 38 40 W |
| Jefferson | Populated Place | 243 | Jefferson | 43 00 20 N | 088 48 26 W |
| Jefferson 2WP916 Dam | Dam | 239 | Jefferson | 43 00 12 N | 088 48 36 W |
| Jefferson Annex Elementary School | School | 187 | Kenosha | 42 35 54 N | 087 49 56 W |
| Jefferson City Hall | Building | 244 | Jefferson | 43 00 12 N | 088 48 27 W |
| Jefferson County | Civil | 246 | Jefferson | 43 02 00 N | 088 46 00 W |
| Jefferson County Courthouse | Building | 245 | Jefferson | 43 00 10 N | 088 48 24 W |
| Jefferson County Fairgrounds | Park | 245 | Jefferson | 43 00 42 N | 088 49 05 W |
| Jefferson Elementary School | School | 349 | Barron | 45 30 01 N | 091 44 41 W |
| Jefferson Elementary School | School | 180 | Brown | 44 31 40 N | 088 01 14 W |
| Jefferson Elementary School | School | 260 | Dodge | 43 26 52 N | 088 49 58 W |
| Jefferson Elementary School | School | 281 | Dodge | 43 37 38 N | 088 44 47 W |
| Jefferson Elementary School | School | 186 | Kenosha | 42 35 49 N | 087 49 48 W |
| Jefferson Elementary School | School | 200 | La Crosse | 43 50 15 N | 091 14 49 W |
| Jefferson Elementary School | School | 390 | Lincoln | 45 10 29 N | 089 43 37 W |
| Jefferson Elementary School | School | 197 | Manitowoc | 44 04 49 N | 087 40 02 W |
| Jefferson Elementary School | School | 225 | Milwaukee | 43 00 21 N | 088 00 13 W |
| Jefferson Elementary School | School | 242 | Outagamie | 44 15 15 N | 088 25 30 W |
| Jefferson Elementary School | School | 332 | Portage | 44 31 08 N | 089 34 16 W |
| Jefferson Elementary School | School | 225 | Richland | 43 20 24 N | 090 23 14 W |
| Jefferson Elementary School | School | 197 | Sheboygan | 43 45 43 N | 087 43 31 W |
| Jefferson Elementary School | School | 231 | Winnebago | 44 00 31 N | 088 32 38 W |
| Jefferson Elementary School | School | 229 | Winnebago | 44 12 12 N | 088 25 56 W |
| Jefferson Elementary School | School | 386 | Wood | 44 39 26 N | 090 10 36 W |
| Jefferson High School | School | 241 | Jefferson | 43 00 14 N | 088 49 10 W |
| Jefferson Junction | Populated Place | 249 | Jefferson | 43 02 13 N | 088 47 24 W |
| Jefferson Lighthouse Elementary School | School | 192 | Racine | 42 43 35 N | 087 48 10 W |
| Jefferson Middle School | School | 251 | Jefferson | 43 00 16 N | 088 48 44 W |
| Jefferson Park | Park | 233 | Fond du Lac | 43 46 10 N | 088 26 34 W |
| Jefferson Park | Park | 260 | Rock | 42 40 56 N | 089 00 57 W |
| Jefferson Park | Park | 229 | Winnebago | 44 12 14 N | 088 25 43 W |
| Jefferson Post Office | Post Office | 249 | Jefferson | 43 00 16 N | 088 48 20 W |
| Jefferson School | School | 227 | Milwaukee | 42 58 06 N | 088 03 15 W |
| Jefferson School | School | 207 | Milwaukee | 43 02 31 N | 087 59 56 W |
| Jefferson School | School | 194 | Milwaukee | 43 02 40 N | 087 54 22 W |
| Jefferson School | School | 221 | Oconto | 44 52 18 N | 088 08 58 W |
| Jefferson School | School | 266 | Rock | 42 42 07 N | 088 59 57 W |
| Jefferson School (historical) | School | 286 | Brown | 44 20 34 N | 088 01 47 W |
| Jefferson School (historical) | School | 284 | Calumet | 43 59 58 N | 088 08 32 W |
| Jefferson School (historical) | School | 289 | Dodge | 43 29 15 N | 088 49 01 W |
| Jefferson School (historical) | School | 233 | Fond du Lac | 43 46 10 N | 088 26 34 W |
| Jefferson School (historical) | School | 256 | Fond du Lac | 43 42 33 N | 088 29 30 W |
| Jefferson School (historical) | School | 259 | Kewaunee | 44 29 14 N | 087 44 05 W |
| Jefferson School (historical) | School | 430 | Marathon | 45 06 29 N | 089 35 26 W |
| Jefferson School (historical) | School | 245 | Outagamie | 44 25 48 N | 088 34 00 W |
| Jefferson School (historical) | School | 205 | Sheboygan | 43 37 10 N | 087 46 56 W |
| Jeffery Elementary School | School | 201 | Kenosha | 42 32 48 N | 087 51 20 W |
| Jeffris | Populated Place | 509 | Lincoln | 45 30 07 N | 089 25 49 W |
| Jeffris Junction | Locale | 511 | Oneida | 45 28 13 N | 089 25 29 W |
| Jeffris Park | Park | 232 | Rock | 42 40 10 N | 089 00 42 W |
| Jeglum Valley | Valley | | Dane | 42 52 15 N | 089 48 15 W |
| Jehn Cemetery | Cemetery | 396 | Marathon | 45 06 49 N | 089 41 38 W |
| Jenkins Theater | Building | 333 | Portage | 44 31 36 N | 089 34 20 W |
| Jenkins Valley | Valley | | La Crosse | 43 53 03 N | 090 54 52 W |
| Jenkins Valley | Valley | | Monroe | 44 04 16 N | 090 49 38 W |
| Jenkins Valley Creek | Stream | | Monroe | 44 04 36 N | 090 49 45 W |
| Jenkins Valley School | School | 277 | Monroe | 44 03 08 N | 090 49 15 W |
| Jenkinsville | Populated Place | 269 | Lafayette | 42 38 05 N | 090 22 11 W |
| Jenkyns Point | Cape | 229 | Winnebago | 44 06 56 N | 088 28 17 W |
| Jennie Creek | Stream | | Oneida | 45 33 22 N | 089 32 56 W |
| Jennie Webber Creek | Stream | | Oneida | 45 41 00 N | 089 17 14 W |
| Jennie Webber Lake | Lake | 487 | Oneida | 45 44 25 N | 089 19 49 W |