Kevin,
quite interesting, pls. send link if done.

If you can provide time series temperature / weather data for the counties as well I might play with your data even more. Reason:

My very personal hunch revolves around difference in case lethality due to weather/season/temperature - currently myself oscillating between classifying own thoughts between wishful thinking on data patterns heavily marred by selection effects (think different amount of testing due to finances, different levels/percentages of infections, different mitigation strategies, different age pyramids and so on to knock off the worst) and some hunches following early expectations, like southern hemisphere having less trouble early on (as summer was there) despite being located nearer to point of origin, places nearer equator, where death rate at some places like Singapore and Oil-rich red sea countries is close to zero and in other places where medical infrastructure is less sophisticated compared to "western world" you see infection and death rates much lower than expected from medical level - think Iran, South Africa, Uruguay, Paraguay and so on.

US is large enough to have different temperature zones (might for instance be a factor in TX having less troubles overall and FL with probably juiciest age structure for the reaper to follow corona infection compared to states on northern border (excepting NY, NJ and close spots due to overrun medical facilities) while differences in medical level - while existing - will be less marked than between different countries.

If my hunch is true and no vaccine or working treatment is found within 4 month, northern hemisphere will actually have made next winters death toll higher by curbing infection rate while chance to overcome infection
is best - and either personally distance from most even more starting october or think about a few months of extended stay in Australia, New Zealand or South Africa if they let me in...

regards
thomas

>I have an article that's will come out in "about" a month or so, and will be available online
>
>I've been tracking daily case and death counts for all U.S. counties
>I joined that owith a master table of population counts and land square mile population by county
>
>The article shows how to create a dashboard solution in Power BI.
>
>Basically, you can look at how things "looked" on any day going back to early March.
>
>I got tired of fancy charts at the national level that had little or no drilldown features into state specifics
>And the ones available at the state level were not standardized and often did not contain any population density figures.
>
>I might publish the actual dashboard site sooner than July.