Ind. Code § 27-1-7-3
Each corporation shall maintain an office or place of business in this state, to be known as the "Principal Office." The post-office address of the principal office shall be stated in the original articles of incorporation at the time of incorporating. Thereafter, the location of the principal office, may be changed at any time or from time to time when authorized by the board of directors by:
As amended by P.L.94-1999, SEC.1.