 Mellen has a mayor-council form of government.In the Wisconsin State Legislature, Mellen is located in the 74th Assembly District, and the 25th Senate District, represented by Assembly Representative Beth Meyers and State Senator Janet Bewley

In the United States House of Representatives, Mellen is served by Sean Duffy, of Wisconsin's 7th congressional district

Mellen is located at (46.324288, -90.659295), along the Bad River.According to the United States Census Bureau, the city has a total area of , all of it land.