Nemaha, IA has a population of 100 and is the 26,911th largest city in the United States. The population density is 1,360 per sq mi which is 2389% higher than the Iowa average and 1401% higher than the national average. The median age in Nemaha is 35 which is approximately 9% lower than the Iowa average of 38. In Nemaha, 50% of the population over 15 years of age are married, 88% speak English and 12% speak Spanish. 70% of Nemaha residents were born in Iowa, 27% were born out of state, 0% were born outside of the United States and 3% were foreign born.