Sheffield, AL has a population of 9,067 and is the 4,235th largest city in the United States. The population density is 1,424 per sq mi which is 1447% higher than the Alabama average and 1471% higher than the national average. The median age in Sheffield is 43 which is approximately 12% higher than the Alabama average of 39. In Sheffield, 50% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 74% of Sheffield residents were born in Alabama, 24% were born out of state, 1% were born outside of the United States and 2% were foreign born.