(Whirling Windmill, IA-81-123) N. of Sac City, Jackson Township, Sac County, IA. 5th St. (becomes Sierra Av.) N. 3.2 miles from jct with Main St. in Sac City to the quilt on the W. side of the road at 2257. Body Family. (N42 28.072 W94 59.635) Photos by Jack & June Schmidt 7-18-12.