| Number | County | Name | Owner | Verif | GPS | Description |
| IA-42-01 | Hardin | Double Windmill | Schwarz Farm | 07-2012 | N42 16.385 W93 00.157 | N. of Whitten, Union Township. B Av. N. 0.9 miles from jct with Union/305th St. in Whitten to the quilt on the W. side of the road at 29657. |
| IA-42-02 | I-State | Schwarz Farm | 07-2012 | N42 16.331 W93 00.138 | Same as IA-42-01. |