| Adair County | 17 | Greenfield Township1,932 people |
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| Adams County | 12 | Quincy Township1,551 people |
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| Allamakee County | 18 | Makee Township3,967 people |
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| Appanoose County | 17 | Vermillion Township899 people |
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| Audubon County | 12 | Leroy Township2,347 people |
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| Benton County | 20 | Fremont Township2,670 people |
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| Black Hawk County | 17 | Black Hawk Township3,105 people |
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| Boone County | 17 | Des Moines Township13,343 people |
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| Bremer County | 14 | Jefferson Township3,584 people |
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| Buchanan County | 16 | Washington Township4,272 people |
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| Buena Vista County | 16 | Nokomis Township2,514 people |
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| Butler County | 16 | Albion Township2,080 people |
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| Calhoun County | 16 | Lincoln Township1,824 people |
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| Carroll County | 16 | Union Township1,584 people |
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| Cass County | 16 | Grove Township7,084 people |
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| Cedar County | 17 | Center Township4,136 people |
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| Cerro Gordo County | 16 | Clear Lake Township1,469 people |
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| Cherokee County | 16 | Cherokee Township5,821 people |
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| Chickasaw County | 12 | New Hampton Township3,139 people |
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| Clarke County | 12 | Troy Township985 people |
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| Clay County | 16 | Lone Tree Township822 people |
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| Clayton County | 22 | Jefferson Township2,675 people |
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| Clinton County | 18 | DeWitt Township6,316 people |
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| Crawford County | 20 | Denison Township8,770 people |
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| Dallas County | 16 | Walnut Township39,414 people |
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| Davis County | 15 | Cleveland Township911 people |
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| Decatur County | 16 | Garden Grove Township377 people |
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| Delaware County | 16 | Delaware Township6,740 people |
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| Des Moines County | 12 | Flint River Township1,924 people |
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| Dickinson County | 12 | Center Grove Township8,793 people |
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| Dubuque County | 18 | Dubuque Township7,800 people |
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| Emmet County | 12 | Estherville Township6,218 people |
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| Fayette County | 20 | Jefferson Township6,295 people |
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| Floyd County | 12 | Rock Grove Township1,716 people |
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| Franklin County | 16 | Marion Township1,184 people |
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| Fremont County | 13 | Sidney Township1,450 people |
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| Greene County | 15 | Junction Township808 people |
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| Grundy County | 14 | Palermo Township3,038 people |
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| Guthrie County | 17 | Cass Township2,717 people |
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| Hamilton County | 16 | Lyon Township1,411 people |
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| Hancock County | 16 | Concord Township3,319 people |
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| Hardin County | 15 | Hardin Township5,704 people |
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| Harrison County | 20 | St. John Township4,046 people |
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| Henry County | 12 | New London Township2,685 people |
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| Howard County | 12 | Vernon Springs Township4,454 people |
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| Humboldt County | 12 | Delana Township583 people |
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| Ida County | 12 | Corwin Township2,152 people |
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| Iowa County | 16 | Troy Township3,611 people |
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| Jackson County | 18 | South Fork Township4,371 people |
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| Jasper County | 19 | Newton Township15,266 people |
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| Jefferson County | 12 | Center Township1,233 people |
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| Johnson County | 21 | Penn Township31,822 people |
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| Jones County | 16 | Fairview Township7,338 people |
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| Keokuk County | 17 | Sigourney Township2,067 people |
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| Kossuth County | 28 | Cresco Township888 people |
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| Lee County | 16 | Madison Township9,121 people |
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| Linn County | 19 | Marion Township44,817 people |
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| Louisa County | 12 | Columbus City Township2,856 people |
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| Lucas County | 12 | Washington Township720 people |
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| Lyon County | 18 | Rock Township3,297 people |
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| Madison County | 16 | Madison Township1,633 people |
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| Mahaska County | 18 | Prairie Township1,683 people |
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| Marion County | 12 | Lake Prairie Township12,903 people |
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| Marshall County | 16 | Taylor Township19,661 people |
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| Mills County | 13 | Glenwood Township6,037 people |
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| Mitchell County | 16 | Osage Township3,658 people |
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| Monona County | 19 | Maple Township701 people |
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| Monroe County | 12 | Troy Township4,662 people |
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| Montgomery County | 12 | Red Oak Township5,843 people |
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| Muscatine County | 14 | Bloomington Township24,353 people |
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| O'Brien County | 16 | Floyd Township5,503 people |
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| Osceola County | 12 | West Holman Township2,023 people |
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| Page County | 16 | Nodaway Township5,775 people |
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| Palo Alto County | 16 | Emmetsburg Township2,712 people |
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| Plymouth County | 24 | America Township11,228 people |
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| Pocahontas County | 17 | Center Township1,865 people |
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| Polk County | 21 | Des Moines Township100,004 people |
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| Pottawattamie County | 29 | Kane Township54,071 people |
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| Poweshiek County | 16 | Bear Creek Township1,772 people |
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| Ringgold County | 17 | Washington Township485 people |
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| Sac County | 16 | Jackson Township2,085 people |
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| Scott County | 13 | Pleasant Valley Township41,593 people |
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| Shelby County | 16 | Clay Township984 people |
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| Sioux County | 23 | West Branch Township7,272 people |
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| Story County | 16 | Washington Township46,860 people |
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| Tama County | 21 | Tama Township3,117 people |
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| Taylor County | 17 | Platte Township1,683 people |
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| Union County | 12 | Union Township1,184 people |
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| Van Buren County | 14 | Jackson Township1,333 people |
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| Wapello County | 14 | Center Township26,937 people |
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| Warren County | 17 | Linn Township11,330 people |
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| Washington County | 15 | Washington Township7,864 people |
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| Wayne County | 16 | Corydon Township1,786 people |
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| Webster County | 23 | Dayton Township1,146 people |
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| Winnebago County | 12 | Forest Township4,542 people |
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| Winneshiek County | 20 | Decorah Township9,351 people |
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| Woodbury County | 23 | Woodbury Township6,439 people |
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| Worth County | 12 | Grove Township2,436 people |
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| Wright County | 16 | Eagle Grove Township3,812 people |
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