Phillips County Colorado (Historic Districts) has 5 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Heginbotham, W. E., House, Hargreaves Homestead Rural Historic District, Harms Farm, Millage Farm Rural Historic District and Oltjenbruns Farm.
Some of the country's most noteable architects helped create the Phillips County places including Michael McEachern, John Harms, Fred Gansemer and Robert Buchholz. Prominent architectural styles found in Phillips Country are Bungalow/Craftsman, Colonial Revival and Late 19th And 20th Century Revivals.