Dammeron Valley is a census-designated place in Washington County, Utah, United States. The population was 803 at the 2010 census. Although Dammeron Valley is unincorporated, it has its own ZIP code of 84783. As of the census of 2010, there were 803 people residing in the CDP. There were 317 housing units. The racial makeup of the town was 98.6% White, 0.5% American Indian and Alaska Native, 0.7% Asian, 0.2% Native Hawaiian and Other Pacific Islander, 0.4% from some other race, and 1.5% from two or more races. Hispanic or Latino of any race were 1.5% of the population.