Blue Mountain, AR has a population of 100 and is the 26,926th largest city in the United States. The population density is 93 per sq mi which is 68% higher than the Arkansas average and 3% higher than the national average. The median age in Blue Mountain is 50 which is approximately 31% higher than the Arkansas average of 38. In Blue Mountain, 43% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 51% of Blue Mountain residents were born in Arkansas, 49% were born out of state, 0% were born outside of the United States and 0% were foreign born.