The Deseret News publishes a directory of "PRESIDING ELDERS AND BISHOPS of the Church of Jesus Christ of Latter-day Saints." This is a list of twenty-one regional bishops. Cache Valley's "presiding bishop" presides over twenty-four wards, while Iron County's presiding bishop is responsible for two wards. They are also called "stake bishops."
[The Mormon Hierarchy - Extensions of Power by D. Michael Quinn, [New Mormon History database (http://bit.ly/NMHdatabase)]]