interstate compact
formal agreement between two or more U.S. states
National Popular Vote Interstate Compact
not yet active agreement between some states of the United States of America to allocate their presidential electors to the winner of the national popular vote
Palisades Interstate Park Commission
interstate compact between the U.S. states of New York and New Jersey
Articles of Confederation
first constitution of the United States (1781–1789)
Emergency Management Assistance Compact
mutual aid agreement between states and territories of the United States
Colorado River Compact
US interstate surface water allocation agreement
Washington Metropolitan Area Transit Authority
public transit authority serving the Washington, D.C. metropolitan area
Metropolitan Washington Airports Authority
airport authority for Washington Dulles International and Washington Reagan National Airports