Sigourney, IA has a population of 2,105 and is the 10,721st largest city in the United States. The population density is 964 per sq mi which is 1665% higher than the Iowa average and 964% higher than the national average. The median age in Sigourney is 47 which is approximately 23% higher than the Iowa average of 38. In Sigourney, 64% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 80% of Sigourney residents were born in Iowa, 18% were born out of state, 1% were born outside of the United States and 1% were foreign born.