Havana Township is located in Mason County, Illinois, United States. As of the 2010 census, its population was 4,816 and it contained 2,295 housing units.
Havana Township was named after Havana, the capital of Cuba.
According to the 2010 census, the township has a total area of , of which (or 97.97%) is land and (or 2.03%) is water.
Havana township is home to a predominantly white population, with the remaining residents either being of Hispanic origin, having two or more races, or being Native Americans.
Havana township contains a fairly even gender split, with 52% of the population being registered as male.
The average age of residents in Havana Township is 43.8. 56% of residents are between 18 and 64 years of age, with the groups of 65+ and 18 or less being fairly even (23% and 21% respectively).