It is amazing what one can find going through drafts of posts that were composed but never posted. Here is one from 2017.
Recently reported research on car-free households in states, major metropolitan areas, and major cities, Car-Free Living in the United States: What the Data Says, indicates that Sacramento metropolitan area increased its car-free households by 0.5%, and the core city (mostly the city of Sacramento) from 9.7% to 10.7%, from 2010 to 2015. Sacramento is #6 in the list at right, not bad
My previous post on car-free workers was Central city car-free workers (2016-04-24), which indicated a central city rate of 5% to 18%, depending on zip code. Since these statistics are workers rather than households, they are related but not directly comparable, since the number of workers per household is often more than one, but sometimes zero.