Lamoni, IA has a population of 2,616 and is the 9,567th largest city in the United States. The population density is 783 per sq mi which is 1333% higher than the Iowa average and 764% higher than the national average. The median age in Lamoni is 23 which is approximately 40% lower than the Iowa average of 38. In Lamoni, 36% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 46% of Lamoni residents were born in Iowa, 49% were born out of state, 1% were born outside of the United States and 4% were foreign born.