| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Jackson | city | Iowa | United States | 42.15417 | -91.3525 | 853 | 2125 |
| Jackson Junction | city | Iowa | United States | 43.115 | -92.03222 | 1148 | 982 |
| Jacksonville | city | Iowa | United States | 41.64528 | -95.14972 | 1348 | 561 |
| Jacksonville | city | Iowa | United States | 43.11944 | -92.20889 | 1151 | 974 |
| Jacksonville historical | city | Iowa | United States | 41.10556 | -93.55833 | 1049 | 429 |
| Jacobs | city | Iowa | United States | 41.665 | -92.66861 | 997 | 512 |
| Jamaica | city | Iowa | United States | 41.84611 | -94.30944 | 1036 | 1003 |
| James | city | Iowa | United States | 42.57694 | -96.31722 | 1138 | 6843 |
| Jamestown | city | Iowa | United States | 41.42917 | -92.35472 | 902 | 766 |
| Jamestown | city | Iowa | United States | 41.49444 | -90.70806 | 751 | 9112 |
| Jamison | city | Iowa | United States | 41.12167 | -93.72472 | 1000 | 955 |
| Janesville | city | Iowa | United States | 42.64611 | -92.46278 | 889 | 4754 |
| Jay | city | Iowa | United States | 41.10667 | -93.58639 | 1049 | 438 |
| Jefferson | city | Iowa | United States | 42.01528 | -94.37722 | 1076 | 1037 |
| Jeffersonville historical | city | Iowa | United States | 40.60972 | -91.44583 | 531 | 4825 |
| Jerico | city | Iowa | United States | 43.18417 | -92.55528 | 1174 | 645 |
| Jerome | city | Iowa | United States | 40.71889 | -93.02806 | 1000 | 555 |
| Jesup | city | Iowa | United States | 42.47556 | -92.06361 | 974 | 1982 |
| Jewell | city | Iowa | United States | 42.30694 | -93.64 | 1062 | 691 |
| Johnson historical | city | Iowa | United States | 42.14917 | -91.03278 | 800 | 785 |
| Johnston | city | Iowa | United States | 41.67306 | -93.6975 | 826 | 36578 |
| Joice | city | Iowa | United States | 43.36278 | -93.45361 | 1249 | 555 |
| Jolley | city | Iowa | United States | 42.47889 | -94.71861 | 1223 | 1117 |
| Jones Siding | city | Iowa | United States | 42.68 | -94.20778 | 1069 | 4243 |
| Jordan | city | Iowa | United States | 42.04917 | -93.78389 | 1099 | 916 |
| Jordans Grove | city | Iowa | United States | 42.15583 | -91.49833 | 958 | 1545 |
| Jubilee | city | Iowa | United States | 42.38417 | -92.10361 | 905 | 892 |
| Judd | city | Iowa | United States | 42.47222 | -94.04944 | 1108 | 1552 |
| Julien | city | Iowa | United States | 42.48111 | -90.77944 | 885 | 13129 |
| Junction Switch | city | Iowa | United States | 42.27667 | -91.20278 | 839 | 3882 |
| Junction historical | city | Iowa | United States | 43.08528 | -91.62917 | 1085 | 927 |
| Juniata | city | Iowa | United States | 42.58028 | -95.14778 | 1400 | 2469 |
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