| County | County Seat |
Pop.Cnty
07/01/06 est. |
| Adair | Greenfield | |
| Adams | Corning | |
| Audubon | Audubon | |
| Buena Vista | Storm Lake | |
| Carroll | Carroll | |
| Cass | Atlantic | |
| Cherokee | Cherokee | |
| Clarke | Osceola | |
| Clay | Spencer | |
| Crawford | Denison | |
| Decatur | Leon | |
| Dickinson | Spirit Lake | |
| Fremont | Sidney | |
| Guthrie | Guthrie Cntr | |
| Harrison | Logan | |
| Ida | Ida Grove | |
| Lyon | Rock Rapids | |
| Mills | Glenwood | |
| Monona | Onawa | |
| Montgomery | Red Oak | |
| O'Brien | Primghar | |
| Osceola | Sibley | |
| Page | Clarinda | |
| Plymouth | Le Mars | |
| Pottawattamie | Council Bluffs | |
| Ringgold | Mount Ayr | |
| Sac | Sac City | |
| Shelby | Harlan | |
| Sioux | Orange City | |
| Taylor | Bedford | |
| Union | Creston | |
| Woodbury | Sioux City |
 |
|
The Congressman
for this district is U.S. Rep.
Steve King (R)
|
