Lambs Grove, IA has a population of 200 and is the 24,435th largest city in the United States. The population density is 1,953 per sq mi which is 3475% higher than the Iowa average and 2056% higher than the national average. The median age in Lambs Grove is 41 which is approximately 7% higher than the Iowa average of 38. In Lambs Grove, 80% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 77% of Lambs Grove residents were born in Iowa, 22% were born out of state, 1% were born outside of the United States and 0% were foreign born.