There's a nice color coded map at
https://covid.cdc.gov/covid-data-tracker/#vaccinations. While the lowest percentage States mostly correlate with another colored map (GA excluded), they are also very rural.
I'd imagine that the few densely populated areas of those States are pretty highly vaccinated. If somebody lives out in the middle of nowhere and never spends a significant amount of time gathered indoors in crowded scenarios, I don't think that them not being vaccinated will alter the trajectory of the pandemic much.
On this other color coded map from the CDC (
https://covid.cdc.gov/covid-data-tracker/#cases_community), the level of community spread in most of those states low on the vaccination percentage list are shown as having a "moderate" level of community transmission. Only CA is shown as "low" and many States with much higher vaccination percentages are also in the "moderate" category.
Getting to 60% of the population in FL vaccinated (which will hopefully happen in a couple of months) will have a much greater impact on reducing community spread than getting 80% of Wyoming vaccinated (which isn't ever going to happen anyway).