"Mason County"@en . "14666"^^ . . "10.4248"^^ . . . "6.21597e+07"^^ . "Mason County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 14,666. Its county seat is Havana. The county is named in honor of George Mason, a member of the Virginia legislature who campaigned for the adoption of the United States Bill of Rights."@en . . "1.45816e+09"^^ . . "4.3"^^ . "1.396e+09"^^ . "2010Z"^^ . .