Diehlstadt, MO has a population of 181 and is the 24,899th largest city in the United States. The population density is 2,438 per sq mi which is 2609% higher than the Missouri average and 2591% higher than the national average. The median age in Diehlstadt is 38 which is approximately equal to the Missouri average of 38. In Diehlstadt, 54% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 67% of Diehlstadt residents were born in Missouri, 33% were born out of state, 0% were born outside of the United States and 0% were foreign born.