Especially in the Salt Lake area. There's 5 based in Salt Lake alone and 4 more in its suburbs, plus one centered in St George.
It seems to me that it would make more sense to shrink and merge all of Utah's northern-ish missions and combine St George with Las Vegas. Because deploying 1000 missionaries to Utah is probably way too much. Especially for a place where the church is prominent and has a majority presence.