Dietrich, ID has a population of 366 and is the 21,369th largest city in the United States. The population density is 1,131 per sq mi which is 5829% higher than the Idaho average and 1149% higher than the national average. The median age in Dietrich is 29 which is approximately 20% lower than the Idaho average of 36. In Dietrich, 84% of the population over 15 years of age are married, 84% speak English and 16% speak Spanish. 53% of Dietrich residents were born in Idaho, 40% were born out of state, 0% were born outside of the United States and 7% were foreign born.