My n=1 anecdote. After spending the duration of the COVID 19 era in NC, I returned back to my home in Boston area today. In just 5 hours the differences between how the residents adapt to limit the spread are stark. I'd say I've seen 95% adherence in MA, and those 5% were people going for a walk around the neighborhood, that kind of thing. On the other hand, before the NC Gov mandated masks (which the county sheriff said he wouldn't enforce), it was like, 20% masks - 80% not. After the mandate, depending on whether a store itself had a policy, it may be 25/75 without a stated policy, maybe reverse that if there was a policy. And sorry to get racial, but white people are the worst, 90% of non-mask wearers have been wypipo.*
*Note: all percentages have a margin of error of 0-100%.