evidence: New England leads the U.S. in vaccination rates among adults. Maine, Connecticut and Vermont have the highest vaccination rates among adults, with more than 62% of residents age 18 and over fully vaccinated. Massachusetts and Rhode Island are close behind. The other states and jurisdictions with more than 50% of adults fully vaccinated, in order of highest to lowest vaccination rates, are New Jersey, New Mexico, Hawaii, Maryland, Minnesota, New York, Washington, South Dakota, Colorado, Iowa, Wisconsin, Virginia, Nebraska, District of Columbia, Guam, Oregon, California, Pennsylvania, Delaware, Michigan, New Hampshire and Alaska. The states with the lowest rates of fully vaccinated adults are in the South. In Mississippi, Alabama, Arkansas, Tennessee, Louisiana and Georgia, fewer than 40% of adults are fully vaccinated.