Indiana Code Title 3. Elections § 3-10-8-1

(1) Whenever two (2) or more candidates for a federal, state, legislative, circuit, or school board office receive the highest and an equal number of votes for the office, except as provided in Article 5, Section 5 of the Constitution of the State of Indiana or in IC 20.

(2) Whenever a vacancy occurs in the office of United States Senator, as provided in IC 3-13-3-1.

(3) Whenever a vacancy occurs in the office of United States Representative unless the vacancy occurs less than seventy-four (74) days before a general election.

(4) Whenever a vacancy occurs in any local office the filling of which is not otherwise provided by law.

(5) Whenever required by law for a public question.

(6) Whenever ordered by a court under IC 3-12-8-17 or the state recount commission under IC 3-12-11-18.

(7) Whenever required under IC 3-13-5 to fill a vacancy in a legislative office unless the vacancy occurs less than seventy-four (74) days before a general election.