Jamaica, IA has a population of 242 and is the 23,587th largest city in the United States. The population density is 531 per sq mi which is 871% higher than the Iowa average and 486% higher than the national average. The median age in Jamaica is 40 which is approximately 6% higher than the Iowa average of 38. In Jamaica, 53% of the population over 15 years of age are married, 77% speak English and 23% speak Spanish. 72% of Jamaica residents were born in Iowa, 12% were born out of state, 1% were born outside of the United States and 15% were foreign born.