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Vaccination rates vary among the states. There were nine states -- New Mexico, Vermont, Hawaii, New Hampshire, Massachusetts, Connecticut, Maine, New Jersey and Rhode Island -- that had 70% of their adult population with at least one dose as of Sunday, according to CDC data.

At least 25 states and Washington, D.C., have now fully vaccinated at least half of their adult population with at least one COVID-19 vaccine dose. These include Alaska, California, Maryland, New York, Vermont and Wisconsin.

COVID-19 cases and deaths have been on a major decline since vaccines have been made more available to the public.

Between April 1 and May 22, the seven-day average of newly reported cases dropped from 65,697 to 25,843, and the seven-day average of newly reported deaths declined from 861 to 556, according to CDC data.

Several states have reopened their economies and dropped their mask mandates only for individuals who are fully vaccinated.

\"PHOTO:
Kena Betancur/AFP via Getty Images
PHOTO: People gather in Central Park in New York on May 22, 2021.
>

Many states, however, are dealing with a drop in vaccine demand.

The seven-day average of new vaccine administrations was 3 million on April 1, rose to a peak of 3.3 million on April 11 and declined to 1.8 million on May 22, CDC data showed.

Health officials and other leaders are encouraging any eligible American to schedule their vaccination appointments as soon as possible to keep reducing the number of cases.

Anyone who is looking for an open vaccine appointment can log onto vaccines.gov for more information.

ABC News' Cheyenne Haslett and Arielle Mitropoulos contributed to this report.

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