Pella, IA has a population of 10,280 and is the 3,868th largest city in the United States. The population density is 1,143 per sq mi which is 1992% higher than the Iowa average and 1162% higher than the national average. The median age in Pella is 33 which is approximately 14% lower than the Iowa average of 38. In Pella, 59% of the population over 15 years of age are married, 94% speak English and 1% speak Spanish. 74% of Pella residents were born in Iowa, 21% were born out of state, 1% were born outside of the United States and 4% were foreign born.