Indiana Code Title 3. Elections § 3-11-1.5-33

Sec. 33. (a) If the boundaries of a municipality are extended before a municipal primary election or a municipal election, and the territory within those boundaries has not been included in precincts wholly within the municipality, the voters within the extended boundaries may vote, if otherwise qualified, in the municipal primary election or municipal election.

(b) The voters may vote in the precinct in which they have their residence as if the precinct had been established to include them in a precinct wholly within the municipality.  These votes shall be counted and included in the canvass of the votes cast in the municipal primary election or municipal election.