Arkansas constitution
Article 13: counties, county seats and county lines
Section 1

No county now established shall be reduced to an area of less than six hundred square miles, nor to less than five thousand inhabitants: nor shall any new county be established with less than six hundred square miles and five thousand inhabitants: Provided, that this section shall not apply to the counties of Lafayette, Pope and Johnson, nor be so construed as to prevent the General Assembly from changing the line between the counties of Pope and Johnson.