At the bottom is Mississippi, where 41.5% of adults have received at least one vaccine dose. Similarly, every state on its border has vaccinated less than half of its adult residents.
The contrast between states and regions largely fits along partisan political lines: States that voted Democratic in the most recent presidential election have higher vaccination rates than those that voted Republican. In fact, the 19 states with the highest percentage of vaccinated adults all voted for President Joe Biden. Among the 16 states with the lowest vaccination rates, only Georgia went for Biden, according to the CDC.
Other demographic differences, including age, race and education, have similarly influenced vaccination rates.
At the other end, the five states with the lowest percentage of adults with one dose are Mississippi, Alabama, Louisiana, Wyoming and West Virginia.
These partisan trends are particularly clear within states, too. For example, New York County, which covers heavily Democratic Manhattan, has fully vaccinated 47% of its population. Meanwhile, Orleans County, the rural northwest New York enclave where former President Donald Trump won 67% of the vote, has fully vaccinated 30%.
There are slight differences in these state rankings depending on how exactly you measure, such as whether you look at those partially or fully vaccinated, or whether you compare total population, those older than 18 or those older than 65. Still, the overall demographic trends are clear, and they fit cleanly with America’s politics and demographics.
Why the differences between states
Still, the differences between and within states underscore the United States’ unparalleled vaccination efforts over the past six months. China says it has administered more total vaccines, and Israel has vaccinated a higher percentage of people, but no country near the size of the US has vaccinated as high a percentage of its residents.
“I expect during the month of May we will see daily cases drop dramatically and deaths finally drop to quite low numbers,” he said Sunday.
CNN’s Christina Maxouris contributed to this report.