Where are you getting the raw data? I'm extracting it from the New York Times dataset for my own graphing. They have the data for all counties in the US. I've been meaning to automate the graphing but for now doing it manually.

I wish you had the new cases per day graphed for all the bay area counties because that is what I monitor.

Raw data was originally from SF Chronicle, but they removed their timelapse view so I am now getting it direct from county websites. Stanford Open Data project also has a reasonable historical dataset that comes from the county websites.

I'll add a new cases graph for each county.