COVID-19 California County Trends

These graphs work best on a computer. Phones, not so well. Phone users: check out the blog.

These graphs are interactive (and not very useful or intelligible if viewed without interacting). You can click-and-drag to zoom, single-click on a particular item to turn it on or off, or double-click to show just that item.


The following graph attempts to show broadly “how bad” the epidemic is in each county, based on daily cases. It does this by multiplying DCPM, by the week-over-week growth factor in new cases. Here are the top 20:

And all counties severity:

Daily Cases Per Million

To really compare the numbers of different regions, we need to adjust for population. Hence “daily cases per million” (DCPM), which lets us see how relatively bad a region has it. I define a region as “warm” if DCMP is more than 100, and “hot” if DCPM is more than 200. You’ll definitely want to click-and-drag to zoom in to the busy part of this graph, since there are a few wild outliers that smash everything to the bottom:

The graph below is similar but shows all countries, and shows the moving average rather than the individual days with trendline:

Daily Cases Growth

This next graph shows daily growth of new cases each region. Here is the growth for the top 20 DCPM counties:

And here are all counties (this is mostly just a snarl unless you double-click the legend to select a particular county):