For over a year, I've been tracking the rates of both COVID-19 vaccinations as well as COVID-19 cases & deaths, broken out by county-level partisan lean (namely, what percent of the vote Donald Trump received in 2020).
I've received quite a bit of attention for these analyses, including several national media outlets which have used my work (sometimes with proper attribution, sometimes without) However, there have also been numerous critics who have pointed out that I don't run multivariate analysis when I do this.
Put simply, I look at the correlation between partisan lean and COVID death/vaccination rates or between vaccination rates and COVID death rates...but I don't include other factors like age, income, race/ethnicity, urban-rural status, employment status, health insurance status and so forth.
I've been posting weekly looks at the rate of COVID-19 cases & deaths at the county level since the point at which every U.S. adult could theoretically have received 2 COVID vaccination doses nearly a year ago, broken out by partisan lean (i.e, what percent of the vote Donald Trump received in 2020), as well as by the vaccination rate of each county in the U.S. (nonpartisan).
For a long time I used July 1st, 2021 as my start point, but in December I decided to back this up to May 1st, 2021 instead. Pinning down an exact date for this is a bit tricky since a) different populations were made eligible at different points in 2021, and b) it takes 3-4 weeks after getting your first vaccination dose before you can get the second one, but May 1st is what I've finally settled on. This doesn't really change things much, however.
I go by county residents who have received the 2nd COVID-19 shot only (or 1st in the case of the J&J vaccine).
I base my percentages on the total population via the 2020 U.S. Census including all ages (i.e., it includes kids under 12).
For most states + DC I use the daily data from the Centers for Disease Control, but there are some where the CDC is either missing county-level data entirely or where the CDC data is less than 90% complete at the county level. Therefore:
NOTE: With national COVID deaths continuing to thankfully drop off (the 7-day avg. is down to ~410/day now), I've decided to switch to monthly updates going forward unless COVID deaths start spiking again.
I also recently stopped posting the relative case rates as they've been pretty much stable for the past couple months and the rise of home-based testing, which usually isn't reported to county/state health departments anyway, has made that data somewhat less meaningful.
I've been posting weekly looks at the rate of COVID-19 cases & deaths at the county level since the point at which every U.S. adult could theoretically have received 2 COVID vaccination doses nearly a year ago, broken out by partisan lean (i.e, what percent of the vote Donald Trump received in 2020), as well as by the vaccination rate of each county in the U.S. (nonpartisan).
I go by county residents who have received the 2nd COVID-19 shot only (or 1st in the case of the J&J vaccine).
I base my percentages on the total population via the 2020 U.S. Census including all ages (i.e., it includes kids under 12).
For most states + DC I use the daily data from the Centers for Disease Control, but there are some where the CDC is either missing county-level data entirely or where the CDC data is less than 90% complete at the county level. Therefore:
I've been posting weekly looks at the rate of COVID-19 cases & deaths at the county level since the point at which every U.S. adult could theoretically have received 2 COVID vaccination doses nearly a year ago, broken out by partisan lean (i.e, what percent of the vote Donald Trump received in 2020), as well as by the vaccination rate of each county in the U.S. (nonpartisan).
For a long time I used July 1st, 2021 as my start point, but in recent months I decided to back this up to May 1st, 2021 instead. Pinning down an exact date for this is a bit tricky since a) different populations were made eligible at different points in 2021, and b) it takes 3-4 weeks after getting your first vaccination dose before you can get the second one, but May 1st is what I've finally settled on.
I've been posting weekly looks at the rate of COVID-19 cases & deaths at the county level since the point at which every U.S. adult could theoretically have received 2 COVID vaccination doses nearly a year ago, broken out by partisan lean (i.e, what percent of the vote Donald Trump received in 2020), as well as by the vaccination rate of each county in the U.S. (nonpartisan).
For a long time I used July 1st, 2021 as my start point, but in recent months I decided to back this up to May 1st, 2021 instead. Pinning down an exact date for this is a bit tricky since a) different populations were made eligible at different points in 2021, and b) it takes 3-4 weeks after getting your first vaccination dose before you can get the second one, but May 1st is what I've finally settled on.
I've been posting weekly looks at the rate of COVID-19 cases & deaths at the county level since the point at which every U.S. adult could theoretically have received 2 COVID vaccination doses nearly a year ago, broken out by partisan lean (i.e, what percent of the vote Donald Trump received in 2020), as well as by the vaccination rate of each county in the U.S. (nonpartisan).
For a long time I used July 1st, 2021 as my start point, but in recent months I decided to back this up to May 1st, 2021 instead. Pinning down an exact date for this is a bit tricky since a) different populations were made eligible at different points in 2021, and b) it takes 3-4 weeks after getting your first vaccination dose before you can get the second one, but May 1st is what I've finally settled on.
NOTE: Given how much the national pace of vaccination shots has slowed down recently (the 7-day average is down to around ~330,000/day), this is now a MONTHLY update unless the pace picks up again significantly.
Methodology reminders:
I go by county residents who have received the 2nd COVID-19 shot only (or 1st in the case of the J&J vaccine).
I base my percentages on the total population via the 2020 U.S. Census as opposed to adults only or those over 11 years old (or even over 4 years old).
For most states + DC I use the daily data from the Centers for Disease Control, but there are some where the CDC is either missing county-level data entirely or where the CDC data is less than 90% complete at the county level. Therefore:
As you might expect, there's a clear drop-off in new COVID cases per capita as the vaccination rate of the counties goes up. There seems to bea slight drop-off starting around 50% fully vaccinated, followed by a steep drop-off starting around 65% vaxxed.
There's a third drop-off at around 75%, but there's literally only a handful of counties which have achieved that high a vaccination rate so far anyway.
HOWEVER, there's one major outlier over the 65% threshold...Miami-Dade County.
According to the Centers for Disease Control, Miami-Dade has fully vaccinated 68% of their entire population (1.84 million out of 2.72 million residents). I use the slightly lower official 2020 U.S. Census popualtion count for Miami-Dade County (2,701,767), which makes the vaccination rate slightly higher still: 68.24%.
