Demopolis, AL has a population of 7,167 and is the 5,097th largest city in the United States. The population density is 404 per sq mi which is 339% higher than the Alabama average and 346% higher than the national average. The median age in Demopolis is 37 which is approximately 5% lower than the Alabama average of 39. In Demopolis, 45% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 78% of Demopolis residents were born in Alabama, 20% were born out of state, 0% were born outside of the United States and 2% were foreign born.