Utah Code § 17-79-601: Limit on single family designation.

(1) As used in this section, "single-family limit" means the number of individuals allowed to occupy each residential unit that is recognized by a land use authority in a zone permitting occupancy by a single family.

(2) A county may not adopt a single-family limit that is less than:

(a) three, if the county has within its unincorporated area:

(i) a state university;

(ii) a private university with a student population of at least 20,000; or

(iii) a mountainous planning district; or

(b) four, for each other county.