Indiana Code Title 36. Local Government § 36-6-6-3

Sec. 3. (a) This subsection applies to townships in a county containing a consolidated city.  One (1) member of the legislative body must reside within each legislative body district.  If a member of the legislative body ceases to be a resident of the district from which the member was elected, the office becomes vacant.

(b) This subsection applies to townships not included in subsection (a) or (c).  A member of the legislative body must reside within the township as provided in Article 6, Section 6 of the Constitution of the State of Indiana.  If a member of the legislative body ceases to be a resident of the township, the office becomes vacant.

(c) This subsection applies to a township government that:

One (1) member of the legislative body must reside within the boundaries of each of the former townships that merged.  If a member of the legislative body ceases to be a resident of that former township, the office becomes vacant.