Maryland Code, Courts and Judicial Proceedings § 3-8A-08

(a) If a petition alleges that a child is in need of supervision, the petition shall be filed in the county where the child resides.

(b) If delinquency or violation of § 3-8A-30 of this subtitle is alleged or if a citation is issued, the petition, if any, or the citation shall be filed in the county where the alleged act occurred subject to transfer as provided in § 3-8A-09 of this subtitle.

(c) A peace order request shall be filed in the county where the alleged act occurred subject to transfer as provided in § 3-8A-09 of this subtitle.

(d) If the alleged delinquent act is escape or attempted escape under § 9-404 or § 9-405 of the Criminal Law Article, the petition, if any, shall be filed and the adjudicatory hearing held in the county where the alleged escape or attempted escape occurred unless the court in the county of the child's domicile requests a transfer. For purposes of the disposition hearing, proceedings may be transferred as provided in § 3-8A-09 of this subtitle to the court exercising jurisdiction over the child at the time of the alleged act.