Hartselle, AL has a population of 14,475 and is the 2,912th largest city in the United States. The population density is 882 per sq mi which is 858% higher than the Alabama average and 873% higher than the national average. The median age in Hartselle is 40 which is approximately 4% higher than the Alabama average of 39. In Hartselle, 64% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 74% of Hartselle residents were born in Alabama, 24% were born out of state, 0% were born outside of the United States and 2% were foreign born.