Semmes, AL has a population of 3,786 and is the 7,694th largest city in the United States. The population density is 368 per sq mi which is 280% higher than the Alabama average and 306% higher than the national average. The median age in Semmes is 35 which is approximately 8% lower than the Alabama average of 39. In Semmes, 70% of the population over 15 years of age are married, 92% speak English and 8% speak Spanish. 73% of Semmes residents were born in Alabama, 20% were born out of state, 1% were born outside of the United States and 6% were foreign born.