Though the United States does not have a uniform climate or climate policy, cities are leading the way in sustainability policy creation. Historic preservation and sustainability are large concepts and neither, because of their values-based nature, have a single measurement of success. Linking the concept of historic preservation to sustainability can bring both into the next generation of practice. This thesis explores and analyzes the relationship between the sustainability policies and historic preservation policies of cities. It seeks to uncover whether some of the US cities that have been touted at the most sustainable use historic preservation as part of their approach to sustainability planning, and the extent to which they do so.