§ 36-7-7-3-9

However, a county or municipality described in subsection (b) may join a development authority established under section 1 of this chapter if the fiscal body of the county or municipality:(1) adopts an ordinance authorizing the county or municipality to become a member of the development authority; and(2) adopts a substantially similar resolution to adopt the preliminary development plan of the development authority as set forth under section 1 of this chapter.A development authority shall notify the Indiana economic development corporation promptly in writing when a new member joins the development authority.(b) The following counties or municipalities may join a development authority established under section 1 of this chapter:(1) In the case of a county, a county that is adjacent to a county that:(A) is a member of the development authority; or(B) contains a member of the development authority.(2) In the case of a municipality, a municipality that is located in a county that:(A) is a member of the development authority;(B) is adjacent to a county that is a member of the development authority;

In the case of a municipality, a municipality that is located in a county that:(A) is a member of the development authority;(B) is adjacent to a county that is a member of the development authority; or(C) is adjacent to a county containing a member of the development authority.As added by P.L.83-2020, SEC.2.