Havana is a city and the county seat of Mason County, Illinois, United States. The population was 2,963 at the 2020 census, a decline from …Havana is a city and the county seat of Mason County, Illinois, United States. The population was 2,963 at the 2020 census, a decline from the figure of 3,301 tabulated in 2010. Havana was a major ancient American settlement two thousand years ago, when the largest verified mound of the Western Hopewell Culture was built. Local landmarks were mentioned in the journals of French explorers in the late 1600s. A religious medal dating from the early 1700s suggests that there was missionary activity in what is now Havana. When permanent English-speaking residents arrived in 1822, there was a Pottawatomie village on the site. A ferry was established to the western bank of the Illinois River to a road that followed the Spoon River. There were War of 1812 bounty lands in western Illinois.
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