Wyo. Stat. § 15-1-411: Incorporation of territory within potential urban area.

All territory within one (1) mile of an incorporated city or town, as it now exists or may hereafter be established, is potentially an urban area. No territory within a potential urban area may be incorporated as a city or town unless the governing body of the city or town causing the potential urbanized area to exist, by resolution, approves the proposed incorporation.