Manchester Field Office #1, Northeast Iowa
Serves: Allamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw, Clayton, Delaware, Dubuque, Fayette, Howard, Jackson, Jones, Linn, Winneshiek
Mason City Field Office #2, North Central Iowa
Serves: Butler, Cerro Gordo, Floyd, Franklin, Grundy, Hamilton, Hancock, Hardin, Humboldt, Kossuth, Mitchell, Webster, Winnebago, Worth, Wright
Spencer Field Office #3, Northwest Iowa
Serves: Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet, Ida, Lyon, O'Brien, Osceola, Palo Alto, Plymouth, Pocahontas, Sac, Sioux, and Woodbury
Atlantic Field Office #4, Southwest Iowa
Serves: Adair, Adams, Audubon, Carroll, Cass, Crawford, Fremont, Greene, Guthrie, Harrison, Mills, Monona, Montgomery, Page, Pottawattamie, Ringgold, Shelby, Taylor, Union
Des Moines Field Office #5, South Central Iowa
Serves: Appanoose, Boone, Clarke, Dallas, Decatur, Jasper, Lucas, Madison, Mahaska, Marion, Marshall, Monroe, Polk, Poweshiek, Story, Tama, Warren, Wayne
Washington Field Office #6, Southeast Iowa
Serves: Cedar, Clinton, Davis, Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk, Lee, Louisa, Muscatine, Scott, Van Buren, Wapello, Washington