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Applying specifically to Salt Lake County (Utah's only first-class county), this bill would create a new Commission on Unincorporated Areas, made up of the mayors of Copperton, Herriman, Magna, South Jordan, West Jordan, and West Valley City, plus three appointees from the governor, House speaker, and Senate president. The commission would study unincorporated areas of the county, hold public hearings, and adopt formal plans designating specific unincorporated areas either for future annexation by named municipalities or as best suited to remain unincorporated permanently; once a plan is adopted, an unincorporated area could not be annexed by any city not named in that plan, nor could it incorporate as its own municipality. The bill would require the county to provide staff support to the commission, set procedures for adopting, modifying, or repealing plans (including public notice, hearings, and a 30-day window to legally challenge an adopted plan), and require the commission to report annually to a legislative committee starting in 2027.