Anamosa, IA has a population of 5,459 and is the 6,099th largest city in the United States. The population density is 2,163 per sq mi which is 3859% higher than the Iowa average and 2287% higher than the national average. The median age in Anamosa is 43 which is approximately 12% higher than the Iowa average of 38. In Anamosa, 49% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 74% of Anamosa residents were born in Iowa, 23% were born out of state, 0% were born outside of the United States and 3% were foreign born.