Cullman, AL has a population of 15,156 and is the 2,808th largest city in the United States. The population density is 783 per sq mi which is 751% higher than the Alabama average and 764% higher than the national average. The median age in Cullman is 39 which is approximately 2% higher than the Alabama average of 39. In Cullman, 61% of the population over 15 years of age are married, 93% speak English and 6% speak Spanish. 71% of Cullman residents were born in Alabama, 22% were born out of state, 1% were born outside of the United States and 6% were foreign born.