This is purely anecdotal but let me throw this out there: I used to travel a decent amount pre pandemic and got sick more times than not when I flew. Since the mask requirements I have not gotten sick a single time. Beyond COVID it has done wonders for limiting other colds/flus.
It is almost entirely dependent on location. In WI you can see it:
| Biden | Trump |
Counties | 14 | 58 |
Avg County Size | 154,819 | 62,257 |
Vaccination Rate | 66% | 58% |
County Avg Vac Rate | 67% | 55% |
The correlation coefficient is not impressive, but for something like this 0.73 is kinda shocking.