U.S. companies and organizations use the per diem rate guide published by the General Services Administration which provides rates for a number of cities in the Continental United States. For locations in the US outside the continental US, including Alaska, Hawaii and the US territories and possessions, per Diem rates are published by the Per Diem, Travel and Transportation Allowance Committee (also known as the Per Diem Committee or PDTATAC). For all foreign locations, per Diem rates are established by the Department of State.