Elgin, IA has a population of 737 and is the 17,151st largest city in the United States. The population density is 1,114 per sq mi which is 1939% higher than the Iowa average and 1129% higher than the national average. The median age in Elgin is 40 which is approximately 4% higher than the Iowa average of 38. In Elgin, 66% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 79% of Elgin residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.