| Property | Address | City | Date Listed |
|---|---|---|---|
| Bruce Goldfish Fisheries | E of Thornburg off IA 22 | Thornburg | 09/20/1982 |
| Hayesville Independent School | 231 Washington Street | Hayesville | 08/03/1990 |
| Irwin, John N. and Mary L. (Rankin), House | 633 Grand Ave. | Keokuk | 10/14/1999 |
| Keokuk County Courthouse | Main Street | Sigourney | 07/02/1981 |
| Lancaster School | SE of Sigourney | Sigourney | 10/04/1984 |
| Public Square Historic District | Roughly around Keokuk County Court House | Sigourney | 4/29/99 |
| Saints Peter and Paul Roman Catholic Church | SE of Harper | Harper | 08/06/1986 |
| Sigourney Public Library | 203 N. Jefferson Street | Sigourney | 05/23/1983 |
| Singmaster C.F. and Mary House | 32263 190th Street | Keota vicinity | 1/16/98 |
| What Cheer City Hall | Barnes and Washington Sts. | What Cheer | 08/27/1981 |
| What Cheer Opera House | 201 Barnes Street | What Cheer | 06/04/1973 |
| White Theodore House | Broadway Street | South English | 07/14/1983 |