The trends on mask mandates in Oklahoma are increasingly clear, and the lack of mandates for half the state over the last 23 days is probably associated with ~3200 unnecessary cases and will likely contribute to 24 more deaths.

After 23 days, mask mandate cities have 68 fewer Active Cases per 100k population than cities without mandates.
Mandate cities have announced 172 fewer Cases per 100k population than non-mandate cities.

Were the non-mandate communities (1.9 million people) to have the same trends as the mandate cities (2.05 million people) over the last 23 days, the state would have 3278 fewer cases as of August 9. This would be a 7.5% reduction in total case numbers.

Based on the Oklahoma case mortality rate since June of .74%, we can estimate that 3278 extra cases from a lack of mandates is associated with 24 more deaths. Real differences in mortality won't be apparent for another month for so.

State officials have noted that hospitalizations and cases might be plateauing in the state. However, these data show that while active cases have dropped in mandate cities the last three weeks, they have increased even more sharply in non-mandate cities.

We now have 23 days of data on mask mandates on 6 Oklahoma cities, as well as mandates in 7 other cities that have been in pace for 10-22 days. This data is providing confidence that mask mandates are making a difference. https://kfor.com/news/list-oklahoma-cities-with-mask-mandates/

These are based on my own examination of the OSDH data. A lot more data, graphs, and discussion of methods at http://patricklivingood.oucreate.com/okcovid/mask-mandates/.
As always, comments and corrections are welcome.

I have been tracking OK Covid data for several weeks now, but this is probably the most important @readfrontier @DrEricDing

@rogman99 @SoonerReporter @deeporfunny I thought you might be interested in seeing the divergence between mask-mandate and non-mandate cities in Oklahoma