Ind. Code § 36-4-3-15.5
(a) Except as provided in subsection (b):
(2) a municipality located in the same county as the territory proposed to be annexed;
may, not later than sixty (60) days after the publication of the annexation ordinance, appeal that annexation to a circuit court or superior court of a county in which the annexed territory is located. The complaint must state that the reason the annexation should not take place is that the territory sought to be annexed is not contiguous to the annexing municipality.
(b) This subsection applies to an annexation initiated by property owners under section 5.1 of this chapter in which all property owners within the area to be annexed petition the municipality to be annexed. Either of the following may appeal that annexation to a circuit court or superior court of a county in which the annexed territory is located:
(2) A municipality located in the same county as the territory proposed to be annexed.
An appeal under this subsection must be filed not later than thirty (30) days after the publication of the annexation ordinance. The complaint must state that the reason the annexation should not take place is that the territory sought to be annexed is not contiguous to the annexing municipality.
(d) If the court enters a judgment in favor of the municipality, the annexation may not take effect during the year preceding a year in which a federal decennial census is conducted. An annexation that would otherwise take effect during the year preceding a year in which a federal decennial census is conducted takes effect January 1 of the year in which a federal decennial census is conducted.
As added by Acts 1981, P.L.308, SEC.7. Amended by P.L.5-1989, SEC.98; P.L.224-2001, SEC.12; P.L.113-2010, SEC.118; P.L.207-2014, SEC.2.