Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.7204

(a) For a proceeding under section 7203 involving a registered trust, in the place of registration.

(b) For a proceeding under section 7203 involving a trust not registered in this state, in any place where the trust properly could be registered and, if the trust is created by will and the estate is not yet closed, in the county in which the decedent's estate is being administered.

(c) As otherwise specified by court rule.

(a) In a county in this state in which a trust beneficiary resides.

(b) In a county in which any trust property is located.

(c) If the trust is created by will, in the county in which the decedent's estate was or is being administered.

(d) As otherwise provided by court rule.