One of the core values outlined in the Park City General Plan is preservation of the City's historic character. Park City is home to more than 400 historic sites, including two National Register Historic Districts. The Main Street Historic District was listed on the National Register of Historic Places in 1979. The Mining Boom Era Residences Thematic District, comprised of historically significant residential structures built during the mining boom period of 1872 - 1929 was listed in 1984.
The City has taken great measures to protect historic resources through local designation on Park City's Historic Sites Inventory. Additionally, the City adopted its first Historic District Design Guidelines in 1983 to preserve the historic character of individual historic resources and the Historic Districts for future generations.
In 2009, the City funded a complete overhaul of the regulating documents for the Historic District, including an updated Historic Sites Inventory, new design guidelines, and amendments to the Land Management Code. Again in 2019, the City completed an update to the Historic District Design Guidelines to further protect and preserve these community treasures.