My Seattle suburb zip code just started getting data.

I can calculate the doubling rate the easy way from two data points. Everyone else will lead you on a goose chase solving an exponential equation. .

New/corrected data:
3/25/2020 21
3/27/2020 31
3/28/2020 35
3/29/2020 39


4 days ln [double =2] / ln (39/21) = doubling time

2.77/ .619 = doubling in 4.5 days

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The man who makes no mistakes does not usually make anything.-- Edward John Phelps