Shown is the state flag of Wisconsin, part of a pane of stamps showing the flags of each of the 50 states.

An official design for Wisconsin's state flag was initially provided by the legislature in 1863. Until that date, a flag had not been adopted and Civil war regiments in the field were requesting flags. The legislature formed a 5 member joint select committee to report "a description for a proper state flag." This action resulted in the adoption of Wisconsin's flag. In 1913, the flag was changed, specifying a dark blue background with the state coat of arms centered at each side. That design remained unchanged until 1979, when legislature was asked to change the flag design so it would appear more distinctive and recognizable. They added the word "Wisconsin" and the statehood date in "1848" in white letters, centered respectively above and below the coat of arms.