Ind. Code § 16-20-4-5

Sec. 5. (a) Except as provided in subsection (b), the legislative body of a second class city may by resolution provide for a full-time city health department.

(b) A local official, city legislative body, city fiscal body, or county may not establish a full-time or part-time city health department in a county having a population of more than one hundred seventy thousand (170,000) but less than one hundred seventy-five thousand (175,000).

(c) A health ordinance adopted by a city legislative body after December 31, 1993, in a county having a population of more than one hundred seventy thousand (170,000) but less than one hundred seventy-five thousand (175,000) is void.