Nashua, IA has a population of 1,613 and is the 12,290th largest city in the United States. The population density is 560 per sq mi which is 926% higher than the Iowa average and 518% higher than the national average. The median age in Nashua is 38 which is approximately 1% higher than the Iowa average of 38. In Nashua, 73% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 87% of Nashua residents were born in Iowa, 12% were born out of state, 0% were born outside of the United States and 0% were foreign born.