Jamaica is a city in Guthrie County, Iowa, United States. The population was 195 at the time of the 2020 census. It is part of the Des Moines–…Jamaica is a city in Guthrie County, Iowa, United States. The population was 195 at the time of the 2020 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. Jamaica was platted in 1882.