Sheffield, IA has a population of 1,283 and is the 13,626th largest city in the United States. The population density is 231 per sq mi which is 323% higher than the Iowa average and 155% higher than the national average. The median age in Sheffield is 44 which is approximately 17% higher than the Iowa average of 38. In Sheffield, 71% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 84% of Sheffield residents were born in Iowa, 15% were born out of state, 0% were born outside of the United States and 1% were foreign born.