According to the search results, hundreds of school districts across the United States have adopted a four-day school week in recent years, mostly in rural and western parts of the country. While smaller, rural districts have been more likely to favor the schedule, larger districts are now shortening their school weeks in an effort to recruit and retain teachers. As of June 2023, nearly 900 school districts in the United States currently use a four-day weekly academic schedule, and this number has been increasing.

Some states like Texas, Arkansas, and Missouri have seen the most recent transitions to four-day weeks, and the four-day schedule tends to be most attractive to rural and smaller school districts that face logistical and financial challenges.

It is important to note that only a few large districts have adopted a four-day week. The effect of a four-day school week on academics is murky, although some studies show the schedule doesn’t hurt test scores if the other four school days are lengthened to make up the time.

In summary, while hundreds of school districts across the United States have adopted a four-day school week, it is mostly in rural and western parts of the country, and only a few large districts have adopted this schedule.