In 13 states, over 80% of the population has at least one dose, CDC data shows.
The United States is facing a COVID-19 surge this summer as the more contagious delta variant spreads.
More than 655,000 Americans have died from COVID-19 while over 4.6 million people have died from the disease worldwide, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.
Just 62.7% of Americans ages 12 and up are fully vaccinated against COVID-19, according to data from the U.S. Centers for Disease Control and Prevention.
In hard-hit Louisiana, the Ochsner Health System is seeing a significant decline in COVID-19 patients, now down to 530 -- dropping by nearly 250 patients in the last week, hospital CEO and president Warner Thomas said.
But in the wake of deadly Hurricane Ida, releasing patients from hospitals has been difficult, as some patients have no homes to return to, he said.
-ABC News' Jamie Aranoff
Hospitals in Oregon are "scrambling" to stay afloat with cases and hospitalizations "hovering at or near pandemic highs," the state epidemiologist, Dean Sidelinger, said at COVID-19 briefing Tuesday.
Oregon saw 16,252 new cases in its most recent weekly report – which is 13 times higher than the reported cases for the week ending July 4, Sidelinger said.
Hospitalizations and intensive care unit admissions are "alarmingly high" and hospitals are at a "saturation point" where they aren't "able to provide care to everyone arriving at their door," Sidelinger warned.
Former Phoenix Suns and Los Angeles Lakers player Cedric Ceballos, 52, tweeted that he's on his 10th day in the ICU battling COVID-19.
About 60 military medical personnel are heading in three, 20-person teams to Arkansas, Alabama and Idaho to help treat hospitalized COVID-19 patients following a request from FEMA, the U.S. Army North said.
The personnel, including doctors, nurses and respiratory therapists, were sent to hospitals in Coeur d'Alene, Idaho; Ozark, Alabama; and Little Rock, Arkansas.
Six teams had previously been dispatched to six other hospitals: three in Louisiana, two in Mississippi and one in Dothan, Alabama.
