Baldwin, IA has a population of 146 and is the 25,754th largest city in the United States. The population density is 402 per sq mi which is 636% higher than the Iowa average and 344% higher than the national average. The median age in Baldwin is 44 which is approximately 16% higher than the Iowa average of 38. In Baldwin, 69% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 88% of Baldwin residents were born in Iowa, 12% were born out of state, 1% were born outside of the United States and 0% were foreign born.