Minimum Wage State Flexibility Act of 1999

Minimum Wage State Flexibility Act of 1999 - Amends the Fair Labor Standards Act of 1938 to allow a State to preempt the Federal minimum wage if the State has adopted minimum wage rate legislation that sets wages for at least 95 percent of the workers in that State at an hourly rate not less than 85 percent of the Federal minimum wage.

Authorizes a State Governor to set, for up to 12 months, such a wage rate for such a portion of workers in the State (or in a particular county) under any of the following emergency circumstances: (1) the State welfare-to-work programs would be sufficiently harmed by a higher rate; (2) the State (or county) is experiencing a period of high unemployment; or (3) the State (or county) is experiencing a period of slow economic growth.

Makes Federal minimum requirements applicable to U.S. territories and possessions, including the Commonwealth of the Northern Mariana Islands, in the same manner as to the States.