Altamont, MO has a population of 173 and is the 25,063rd largest city in the United States. The population density is 675 per sq mi which is 682% higher than the Missouri average and 646% higher than the national average. The median age in Altamont is 37 which is approximately 3% lower than the Missouri average of 38. In Altamont, 55% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 87% of Altamont residents were born in Missouri, 12% were born out of state, 0% were born outside of the United States and 1% were foreign born.