12-402. Venue of actions commenced after organization of new county All actions and proceedings, civil and criminal, commenced after the organization of a new county or a county with changed boundaries, shall be begun and proceeded with therein if it would have been the proper county in which to institute the action or proceeding had it been organized before the cause for the proceedings arose.
Arizona Legal Code
§ 12.402
Source: https://www.azleg.gov/ars/12/00402.htm· Version 2026