400
There are this many (operating) temples in Utah.
What is 16 (Logan, Brigham City, Ogden, Bountiful, Salt Lake, Jordan River, Oquirrh Mtn, Draper, Mt Timpanogos, Provo, Provo City Center, Payson, Vernal, Manti, Monticello, St. George...Cedar City under construction)