Ind. Code § 3-11-1.5-10.9

Sec. 10.9. A reference to a census block identified as required by section 15(2) of this chapter in an order described in section 14 of this chapter refers to the census block as it existed on the date of the adoption of the order. A change in a census block issued by the Bureau of the Census following the date of adoption of the order does not alter the precincts established by the order.