Whereas those specifics are not all available from Sonoma County, you could go to the CDC website and likely find that information. Every county will be different depending on who is getting infected but outcomes should be fairly consistent based on underlying health throughout the USA. The best way to understand the severity of the disease is to look at large samples as in entire states or countries with standardized reporting methods.
Don't trust CDC? Go to WHO and look at their figures Or Canada or England. If you don't believe any of it there is no reason to look at any numbers in the first place.
Most first world countries report the rate of disease severe enough to require hospitalization of around 10% in those who have been tested . It's a little under that in England now. You need to also figure in the 45% who have no symptoms most of whom don't get tested. So say around 6 to 7% who get covid get sick enough to require hospitalization.
Some have asserted testing is producing huge numbers of false positives and Covid-19 is not that serious. Overflowing hospitals in Southern California tends to disprove that notion for me. Also huge numbers of false positives would mean Covid-19 is more serious to the percentage of those false positives because we know how many are hospitalized and how many die.