[Jach]

There is a split between Utah County and Salt Lake City. Though according to a friend (I moved away a decade ago) the "Silicon Slopes" locally refers mostly to the area in between (centered around north Lehi where Adobe's building is). However there's always https://en.wikipedia.org/wiki/Silicon_Slopes -- while the region spans SLC and Provo, the claim by 'tntn that the marketing purpose of "Silicon Slopes" was largely to concentrate on the more rural areas in between (i.e. most of Utah County) doesn't seem that unreasonable.