Wyoming constitution
Article 12: county organization
Section 2

The legislature shall provide by general law for organizing new counties, locating the county seats thereof temporarily and changing county lines. But no new county shall be formed unless it shall contain within the limits thereof property of the valuation of two million dollars, as shown by last preceding tax returns, and not then unless the remaining portion of the old county or counties shall each contain property of at least three million dollars of assessable valuation; and no new county shall be organized nor shall any organized county be so reduced as to contain a population of less than one thousand five hundred bona fide inhabitants, and in case any portion of an organized county or counties is stricken off to form a new county, the new county shall assume and be holden for an equitable proportion of the indebtedness of the county or counties so reduced. No county shall be divided unless a majority of the qualified electors of the territory proposed to be cut off voting on the proposition shall vote in favor of the division.