Cumberland, IA has a population of 250 and is the 23,435th largest city in the United States. The population density is 416 per sq mi which is 662% higher than the Iowa average and 359% higher than the national average. The median age in Cumberland is 37 which is approximately 4% lower than the Iowa average of 38. In Cumberland, 65% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 77% of Cumberland residents were born in Iowa, 23% were born out of state, 0% were born outside of the United States and 0% were foreign born.