Almost 130 million people aged 18 or older have received at least one dose of a coronavirus vaccine, or 50.4% of the total adult population.
The Centers for Disease Control and Prevention (CDC) also said almost 84 million adults, or about 32.5% of the population, have had two vaccine doses.
The US cleared the 50% mark just a day after the reported global death toll from the coronavirus topped three million, according to the Johns Hopkins University, though the actual number is believed to be significantly higher.
The country’s vaccination rate, at 61.6 doses administered per 100 people, currently falls behind Israel, which leads among countries with at least five million people with a rate of 119.2.
It also trails the United Arab Emirates, Chile and the UK, which is vaccinating at a rate of 62 doses per 100 people, according to Our World in Data.
The US states with the highest vaccination rates have a history of voting Democratic and supporting President Joe Biden in the 2020 election: New Hampshire at the top, with 71.1%, followed by New Mexico, Connecticut, Massachusetts and Maine, CDC data shows.
The demand has not been the same in many areas of Tennessee – particularly rural ones.
A poll conducted in March found that 36% of Republicans said they will probably or definitely not get vaccinated, compared with 12% of Democrats.