Thanks for the effort.
Have you considered using census data to give rates of cases?
Simple numbers tell us very little except where there are more people, there are more cases.
Other than the speed that it spreads, I see little difference with regard to population density as to what percentage of a given community come within effective contact of the virus.
I believe it will have to reach 60-70% of a community before it levels off and subsides. I used the 80 and greater benchmark as a point at which community efforts (isolation) have lost control and become ineffective. At that point the virus seems to run its course within.
That’s what is immediately apparent. There are more cases where there are more people. I know a lot of work went into that, because I’m too lazy to do it myself. But the one I’d like to see next is the same sort of map showing how many cases per 1000 of population.