| Property | Address | City | Date Listed |
|---|---|---|---|
| Brooks Round Barn | W of US 218 | Charles City | 06/30/1986 |
| Central Park--North Main Street Historic District | N. Main Street and N. Jackson Street | Charles City | 08/10/1976 |
| Cook Farm | S of Charles City on U.S. 218 | Charles City | 06/18/1979 |
| Dodd A. B. C. House | 310 3rd Ave. | Charles City | 05/22/1978 |
| Dr. Salsbury's Laboratories Main Office and Production Laboratory Building | 500 Gilbert Street | Charles City | 03/07/1996 |
| Hart Charles Walter House | 800 3rd Ave. | Charles City | 01/25/1980 |
| Floyd County Courthouse | 101 S. Main Street | Charles City | 8/28/2003 |
| Floyd Hawkeye Street Underpass | South Hawkeye Street under RR | Nora Springs | 6/25/98 |
| Lane Lucius and Maria Clinton House | 2379 Timber Ave. | Charles City | 04/24/1995 |
| Main Street Bridge | Main St. over Cedar R. | Charles City | 3/12/99 |
| Marble Rock Bank | 313 Bradford Street | Marble Rock | 11/10/1982 |
| Miller Alvin House | 1107 Court Street | Charles City | 11/16/1978 |
| Parr Charles Henry House | 100 W. Hulin Street | Charles City | 01/24/1980 |
| River Street Bridge | River Street over drainage ditch | Marble Rock | 6/25/98 |
| Rockford Mill | Shell Rock River at 4th and Main Street | Rockford | 07/28/1983 |
| Spotts Round Barn | IA 14 | Charles City | 06/30/1986 |
| Tyden Farm No. 6 Farmstead Historic District | 1145 300th St. | Dougherty vicinity | 06/11/2009 |
| Wildwood Park Historic District | 1 Wildwood Rd. | Charles City | 9/25/98 |