| Název | Obyvatele | Nad. výška | Souřadnice | 
| Jackson | 
 | 260 m | 42°9' N; 91°21' W | 
| Jackson Junction (Jackson Junction) | 60 | 350 m | 43°6' N; 92°1' W | 
| Jacksonville | 
 | 358 m | 43°7' N; 92°12' W | 
| Jacobs | 
 | 299 m | 41°39' N; 92°40' W | 
| Jamaica (Jamaica) | 240 | 313 m | 41°50' N; 94°18' W | 
| James | 
 | 359 m | 42°34' N; 96°19' W | 
| Jamestown | 
 | 275 m | 41°25' N; 92°21' W | 
| Jamison | 
 | 305 m | 41°7' N; 93°43' W | 
| Janesville (Janesville) | 817 | 271 m | 42°38' N; 92°27' W | 
| Jay | 
 | 311 m | 41°6' N; 93°35' W | 
| Jefferson (Jefferson) | 4 338 | 328 m | 42°0' N; 94°22' W | 
| Jerico | 
 | 355 m | 43°11' N; 92°33' W | 
| Jerome | 
 | 309 m | 40°43' N; 93°1' W | 
| Jesup (Jesup) | 2 198 | 297 m | 42°28' N; 92°3' W | 
| Jewell (Jewell) | 1 188 | 324 m | 42°18' N; 93°38' W | 
| Johnston (Johnston) | 12 547 | 252 m | 41°40' N; 93°41' W | 
| Joice (Joice) | 232 | 383 m | 43°21' N; 93°27' W | 
| Jolley (Jolley) | 51 | 374 m | 42°28' N; 94°43' W | 
| Jones Siding | 
 | 326 m | 42°40' N; 94°12' W | 
| Jordan | 
 | 337 m | 42°2' N; 93°47' W | 
| Jordans Grove | 
 | 292 m | 42°9' N; 91°29' W | 
| Jubilee | 
 | 283 m | 42°23' N; 92°6' W | 
| Judd | 
 | 338 m | 42°28' N; 94°2' W | 
| Julien | 
 | 270 m | 42°28' N; 90°46' W | 
| Junction Switch | 
 | 256 m | 42°16' N; 91°12' W | 
| Juniata | 
 | 427 m | 42°34' N; 95°8' W | 
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