Indiana Code Title 31. Family Law and Juvenile Law § 31-12-2-1

(1) A judicial circuit in which there is located a consolidated city and the judges of the superior court and the judge of the circuit court determine that the social conditions in the county and the number of domestic relations cases in the courts make the procedures provided under this chapter necessary for the full and proper consideration of the cases and the effectuation of the purposes of this chapter.

(2) A county having a population of more than four hundred thousand (400,000) and less than seven hundred thousand (700,000) in which the judge of the circuit court determines that the social conditions in the county and the number of domestic relations cases in the county's courts make the procedures provided under this chapter necessary for the full and proper consideration of the cases and the effectuation of the purposes of this chapter.