From the record
“Sharon Cemetery Historic District is located in rural Harrison Township, Lee County, Iowa, United States near the town of Farmington. It was listed on the National Register of Historic Places in 1991.”
Wikipedia article Sharon Cemetery Historic District, CC BY-SA 4.0.
One of 48 National Register listings published here for Lee County · listed in 1991 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service