Indiana Code Title 36. Local Government § 36-2-2-27

Sec. 27. (a) A party to a proceeding before the executive who is aggrieved by a decision of the executive may appeal that decision to the circuit court, superior court, or probate court for the county.

(b) A person who is not a party to a proceeding before the executive may appeal a decision of the executive only if the person files with the county auditor an affidavit:

(c) An appeal under this section must be taken within thirty (30) days after the executive makes the decision by which the appellant is aggrieved.