Theodore, AL has a population of 6,221 and is the 5,619th largest city in the United States. The population density is 778 per sq mi which is 746% higher than the Alabama average and 759% higher than the national average. The median age in Theodore is 35 which is approximately 9% lower than the Alabama average of 39. In Theodore, 60% of the population over 15 years of age are married, 90% speak English and 6% speak Spanish. 70% of Theodore residents were born in Alabama, 24% were born out of state, 1% were born outside of the United States and 5% were foreign born.