. "1.5"^^ . "41639"^^ . . . "15.4441"^^ . "2.73244e+09"^^ . "2010Z"^^ . "Union County"@en . . . "Union County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 41,639. The county seat is El Dorado."@en . "1829-11-02Z"^^ . "2.691e+09"^^ . . "4.14398e+07"^^ .