South Pass City is an unincorporated community in Fremont County, Wyoming, United States. It is located 2 miles south of the intersection of highways 28 and 131. A former station on the Oregon Trail, it became a ghost town after later gold mines were closed. The entire community is listed on the National Register of Historic Places. The closest town is …South Pass City is an unincorporated community in Fremont County, Wyoming, United States. It is located 2 miles south of the intersection of highways 28 and 131. A former station on the Oregon Trail, it became a ghost town after later gold mines were closed. The entire community is listed on the National Register of Historic Places. The closest town is Atlantic City.