Utah Code Ann. § 20A-7-501
(1) As used in this section:
(2) An eligible voter seeking to have an initiative submitted to a local legislative body or to a vote of the people for approval or rejection shall obtain legal signatures equal to:
(a) for a county of the first class:
(b) for a metro township with a population of 100,000 or more, or a city of the first class:
(c) for a county of the second class:
(d) for a metro township with a population of 65,000 or more but less than 100,000, or a city of the second class:
(e) for a county of the third class:
(f) for a metro township with a population of 30,000 or more but less than 65,000, or a city of the third class:
(g) for a county of the fourth class:
(h) for a metro township with a population of 10,000 or more but less than 30,000, or a city of the fourth class:
(4)
(b) The local legislative body may:
(d)
(e)