From the record
“South Pass City is an unincorporated community in Fremont County, Wyoming, United States. It is located 2 miles (3 km) south of the intersection of Wyoming Highways 28 and 131.”
Wikipedia article South Pass City, Wyoming, CC BY-SA 4.0.
One of 31 National Register listings published here for Fremont County · listed in 2012 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article