| Adair County | 2 | 744 | Nodaway Valley Comm School District, Orient-Macksburg Comm School District |
| Adams County | 1 | 405 | Corning Comm School District |
| Allamakee County | 3 | 2,220 | Allamakee Comm School District, Postville Comm School District, Eastern Allamakee Comm School District |
| Appanoose County | 3 | 1,786 | Centerville Comm School District, Moravia Comm School District, Moulton-Udell Comm School District |
| Audubon County | 1 | 543 | Audubon Comm School District |
| Benton County | 3 | 3,667 | Benton Comm School District, Vinton-Shellsburg Comm School District, Belle Plaine Comm School District |
| Black Hawk County | 5 | 18,810 | Waterloo Comm School District, Cedar Falls Comm School District, Union Comm School District, Hudson Comm School District, Dunkerton Comm School District |
| Boone County | 4 | 3,696 | Boone Comm School District, Ogden Comm School District, Madrid Comm School District, United Comm School District |
| Bremer County | 6 | 5,672 | Waverly-Shell Rock Comm School District, Denver Comm School District, Sumner-Fredericksburg Comm School District, Wapsie Valley Comm School District, Janesville Consolidated School District, Tripoli Comm School District |
| Buchanan County | 3 | 3,025 | Independence Comm School District, Jesup Comm School District, East Buchanan Comm School District |
| Buena Vista County | 5 | 5,113 | Storm Lake Comm School District, Alta-Aurelia Comm School District, Sioux Central Comm School District, Newell-Fonda Comm School District, Albert City-Truesdale Comm School District |
| Butler County | 3 | 1,670 | Aplington-Parkersburg Comm School District, North Butler Comm School District, Clarksville Comm School District |
| Calhoun County | 2 | 1,688 | South Central Calhoun Comm School District, Manson Northwest Webster Comm School District |
| Carroll County | 4 | 3,224 | Carroll Comm School District, IKM-Manning Comm School District, Coon Rapids-Bayard Comm School District, Glidden-Ralston Comm School District |
| Cass County | 3 | 3,991 | CAM Comm School District, Atlantic Comm School District, Griswold Comm School District |
| Cedar County | 5 | 3,030 | West Branch Comm School District, Tipton Comm School District, Durant Comm School District, North Cedar Comm School District, Bennett Comm School District |
| Cerro Gordo County | 3 | 5,658 | Mason City Comm School District, Clear Lake Comm School District, West Fork Comm School District |
| Cherokee County | 2 | 1,542 | Cherokee Comm School District, Marcus-Meriden-Cleghorn Comm School District |
| Chickasaw County | 2 | 1,736 | New Hampton Comm School District, Nashua-Plainfield Comm School District |
| Clarke County | 2 | 1,672 | Clarke Comm School District, Murray Comm School District |
| Clay County | 2 | 2,247 | Spencer Comm School District, Clay Central-Everly Comm School District |
| Clayton County | 3 | 1,843 | MFL MarMac Comm School District, Edgewood-Colesburg Comm School District, Central Comm School District |
| Clinton County | 6 | 7,312 | Clinton Comm School District, Central DeWitt School District, Camanche Comm School District, Northeast Comm School District, Calamus-Wheatland Comm School District, Delwood Comm School District |
| Crawford County | 4 | 2,829 | Denison Comm School District, Ar-We-Va Comm School District, Charter Oak-Ute Comm School District, Schleswig Comm School District |
| Dallas County | 6 | 24,066 | Waukee Comm School District, Dallas Center-Grimes Comm School District, Adel DeSoto Minburn Comm School District, Perry Comm School District, Woodward-Granger Comm School District, Van Meter Comm School District |
| Davis County | 1 | 1,147 | Davis County Comm School District |
| Decatur County | 2 | 967 | Central Decatur Comm School District, Lamoni Comm School District |
| Delaware County | 2 | 1,985 | West Delaware County Comm School District, Maquoketa Valley Comm School District |
| Des Moines County | 4 | 5,632 | Burlington Comm School District, Mediapolis Comm School District, West Burlington Ind School District, Danville Comm School District |
| Dickinson County | 3 | 2,856 | Spirit Lake Comm School District, Okoboji Comm School District, Harris-Lake Park Comm School District |
| Dubuque County | 2 | 14,012 | Dubuque Comm School District, Western Dubuque Comm School District |
| Emmet County | 2 | 1,457 | Estherville Lincoln Central Comm School District, North Union Comm School District |
| Fayette County | 4 | 3,242 | Oelwein Comm School District, North Fayette Valley Comm School District, Starmont Comm School District, West Central Comm School District |
| Floyd County | 2 | 1,785 | Charles City Comm School District, Rudd-Rockford-Marble Rk Comm School District |
| Franklin County | 2 | 1,448 | Hampton-Dumont Comm School District, CAL Comm School District |
| Fremont County | 3 | 1,104 | Fremont-Mills Comm School District, Sidney Comm School District, Hamburg Comm School District |
| Greene County | 2 | 1,425 | Greene County Comm School District, Paton-Churdan Comm School District |
| Grundy County | 4 | 2,721 | Dike-New Hartford Comm School District, Grundy Center Comm School District, Gladbrook-Reinbeck Comm School District, BCLUW Comm School District |
| Guthrie County | 4 | 2,235 | West Central Valley Comm School District, Panorama Comm School District, Guthrie Center Comm School District, Adair-Casey Comm School District |
| Hamilton County | 3 | 2,540 | Webster City Comm School District, South Hamilton Comm School District, Stratford Comm School District |
| Hancock County | 2 | 1,600 | Garner-Hayfield-Ventura Comm School District, West Hancock Comm School District |
| Hardin County | 5 | 2,884 | Iowa Falls Comm School District, AGWSR Comm School District, Eldora-New Providence Comm School District, Hubbard-Radcliffe Comm School District, Alden Comm School District |
| Harrison County | 5 | 2,747 | Missouri Valley Comm School District, Logan-Magnolia Comm School District, Woodbine Comm School District, Boyer Valley Comm School District, West Harrison Comm School District |
| Henry County | 4 | 3,335 | Mount Pleasant Comm School District, New London Comm School District, WACO Comm School District, Winfield-Mt Union Comm School District |
| Howard County | 2 | 1,479 | Howard-Winneshiek Comm School District, Riceville Comm School District |
| Humboldt County | 3 | 1,599 | Humboldt Comm School District, Gilmore City-Bradgate Comm School District, Twin Rivers Comm School District |
| Ida County | 2 | 1,456 | Odebolt Arthur Battle Creek Ida Grove Comm School District, Galva-Holstein Comm School District |
| Iowa County | 4 | 2,499 | Williamsburg Comm School District, Iowa Valley Comm School District, English Valleys Comm School District, H-L-V Comm School District |
| Jackson County | 4 | 2,670 | Maquoketa Comm School District, Bellevue Comm School District, Easton Valley Comm School District, Andrew Comm School District |
| Jasper County | 5 | 5,478 | Newton Comm School District, PCM Comm School District, Colfax-Mingo Comm School District, Lynnville-Sully Comm School District, Baxter Comm School District |
| Jefferson County | 2 | 1,986 | Fairfield Comm School District, Pekin Comm School District |
| Johnson County | 4 | 20,047 | Iowa City Comm School District, Clear Creek Amana Comm School District, Solon Comm School District, Lone Tree Comm School District |
| Jones County | 4 | 2,729 | Anamosa Comm School District, Monticello Comm School District, Midland Comm School District, Olin Consolidated School District |
| Keokuk County | 3 | 1,063 | Sigourney Comm School District, Keota Comm School District, Tri-County Comm School District |
| Kossuth County | 2 | 1,869 | Algona Comm School District, North Kossuth Comm School District |
| Lee County | 3 | 4,859 | Fort Madison Comm School District, Keokuk Comm School District, Central Lee Comm School District |
| Linn County | 11 | 36,506 | All 11 Linn County districts → |
| Louisa County | 4 | 2,165 | Louisa-Muscatine Comm School District, Columbus Comm School District, Wapello Comm School District, Morning Sun Comm School District |
| Lucas County | 1 | 1,295 | Chariton Comm School District |
| Lyon County | 3 | 2,157 | West Lyon Comm School District, Central Lyon Comm School District, George-Little Rock Comm School District |
| Madison County | 3 | 3,146 | Winterset Comm School District, Interstate 35 Comm School District, Earlham Comm School District |
| Mahaska County | 2 | 2,655 | Oskaloosa Comm School District, North Mahaska Comm School District |
| Marion County | 5 | 5,571 | Pella Comm School District, Knoxville Comm School District, Pleasantville Comm School District, Twin Cedars Comm School District, Melcher-Dallas Comm School District |
| Marshall County | 4 | 7,209 | Marshalltown Comm School District, West Marshall Comm School District, East Marshall Comm School District, GMG Comm School District |
| Mills County | 2 | 2,449 | Glenwood Comm School District, East Mills Comm School District |
| Mitchell County | 2 | 1,631 | Osage Comm School District, St Ansgar Comm School District |
| Monona County | 3 | 1,382 | West Monona Comm School District, Maple Valley-Anthon Oto Comm School District, Whiting Comm School District |
| Monroe County | 1 | 1,123 | Albia Comm School District |
| Montgomery County | 3 | 1,498 | Red Oak Comm School District, Stanton Comm School District, Villisca Comm School District |
| Muscatine County | 3 | 6,605 | Muscatine Comm School District, West Liberty Comm School District, Wilton Comm School District |
| O'Brien County | 3 | 2,449 | Sheldon Comm School District, Hartley-Melvin-Sanborn Comm School District, South O'Brien Comm School District |
| Osceola County | 1 | 688 | Sibley-Ocheyedan Comm School District |
| Page County | 4 | 2,535 | Shenandoah Comm School District, Clarinda Comm School District, Essex Comm School District, South Page Comm School District |
| Palo Alto County | 4 | 1,636 | Emmetsburg Comm School District, West Bend-Mallard Comm School District, Graettinger-Terril Comm School District, Ruthven-Ayrshire Comm School District |
| Plymouth County | 5 | 4,427 | Le Mars Comm School District, Hinton Comm School District, Akron Westfield Comm School District, Kingsley-Pierson Comm School District, Remsen-Union Comm School District |
| Pocahontas County | 2 | 860 | Pocahontas Area Comm School District, Laurens-Marathon Comm School District |
| Polk County | 10 | 79,621 | All 10 Polk County districts → |
| Pottawattamie County | 7 | 15,318 | Council Bluffs Comm School District, Lewis Central Comm School District, Underwood Comm School District, Treynor Comm School District, AHSTW Comm School District, Tri-Center Comm School District, Riverside Comm School District |
| Poweshiek County | 3 | 2,598 | Grinnell-Newburg Comm School District, Brooklyn-Guernsey-Malcom Comm School District, Montezuma Comm School District |
| Ringgold County | 2 | 694 | Mount Ayr Comm School District, Diagonal Comm School District |
| Sac County | 2 | 1,062 | East Sac County Comm School District, Schaller-Crestland Comm School District |
| Scott County | 4 | 26,819 | Davenport Comm School District, Pleasant Valley Comm School District, Bettendorf Comm School District, North Scott Comm School District |
| Shelby County | 2 | 1,894 | Harlan Comm School District, Exira-Elk Horn-Kimballton Comm School District |
| Sioux County | 5 | 5,537 | Sioux Center Comm School District, MOC-Floyd Valley Comm School District, Rock Valley Comm School District, West Sioux Comm School District, Boyden-Hull Comm School District |
| Story County | 7 | 11,799 | Ames Comm School District, Ballard Comm School District, Gilbert Comm School District, Nevada Comm School District, Roland-Story Comm School District, Colo-NESCO Comm School District, Collins-Maxwell Comm School District |
| Tama County | 2 | 1,847 | South Tama County, North Tama County Comm School District |
| Taylor County | 2 | 1,041 | Lenox Comm School District, Bedford Comm School District |
| Union County | 2 | 1,797 | Creston Comm School District, East Union Comm School District |
| Van Buren County | 1 | 821 | Van Buren County Comm School District |
| Wapello County | 3 | 7,019 | Ottumwa Comm School District, Cardinal Comm School District, Eddyville-Blakesburg- Fremont CSD |
| Warren County | 5 | 10,443 | Indianola Comm School District, Norwalk Comm School District, Carlisle Comm School District, Martensdale-St Marys Comm School District, Southeast Warren Comm School District |
| Washington County | 3 | 3,503 | Washington Comm School District, Mid-Prairie Comm School District, Highland Comm School District |
| Wayne County | 3 | 1,045 | Wayne Comm School District, Mormon Trail Comm School District, Seymour Comm School District |
| Webster County | 2 | 4,585 | Fort Dodge Comm School District, Southeast Valley Community School District |
| Winnebago County | 3 | 2,190 | Forest City Comm School District, Lake Mills Comm School District, North Iowa Comm School District |
| Winneshiek County | 3 | 2,520 | Decorah Community School District, South Winneshiek Comm School District, Turkey Valley Comm School District |
| Woodbury County | 6 | 18,453 | Sioux City Comm School District, Sergeant Bluff-Luton Comm School District, Lawton-Bronson Comm School District, Westwood Comm School District, Woodbury Central Comm School District, River Valley Comm School District |
| Worth County | 2 | 1,331 | Central Springs Comm School District, Northwood-Kensett Comm School District |
| Wright County | 3 | 2,724 | Clarion-Goldfield-Dows Comm School District, Eagle Grove Comm School District, Belmond-Klemme Comm School District |