Mason County, county in Illinois, United States. As of 2020 county had an estimated population of 13,173 inhabitants. The county was created 183 years ago in 1841. Its county seat is Havana.
There are 1 city/town in Mason County, IL. The largest city of Mason County is San Jose with a population of 587.
San Jose, Village in Logan and Mason counties, Illinois, United States
List of cities, towns, neighborhoods & other populated places in Mason County.
City Name | Title | Population |
---|---|---|
San Jose | Village in Logan and Mason counties, Illinois, United States | 587 |