United States: US East Zone: including the states of Alabama, Connecticut, District of Columbia, Delaware, Florida, Georgia, Maine, Maryland, Massachusetts, New Hamphire, New Jersey, New York, North Carolina, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, Vermont, US Virgin Islands, Virginia, and West Virginia.
US Central Zone: including the states of Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Minnesota, Mississippi Missouri, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota Tennessee, Texas, and Wisconsin.
US West Zone: including the states of Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming.