20-6-421. Conditions for district annexation. (1) An elementary district may be annexed to a contiguous elementary district under the provisions of 20-6-422 when:

(a) a third-class district where a high school is not located is annexed to a third-class district where a high school is located, to a first-class district, or to a second-class district;

(b) a third-class district where a high school is located is annexed to a first-class district or to a second-class district; or

(c) a second-class district is annexed to a first-class district.

(2) A high school district may be annexed to a contiguous high school district or a K-12 school district may be annexed to a contiguous K-12 school district under the provisions of 20-6-422 when:

(a) a third-class district is annexed to a first-class district or to a second-class district; or

(b) a second-class district is annexed to a first-class district.