Becker County is a county located in the U.S. state of Minnesota. As of 2000, the population was 30,000. Its county seat is Detroit Lakes. A portion of the White Earth Indian Reservation extends into the county. According to the U.S. Census Bureau, the county has a total area of 1,445 square miles (3,743 kmē), of which, 1,310 square miles (3,394 kmē) of it is land and 135 square miles (349 kmē) of it (9.32%) is water.