branch manager; bureau chief; head of a branch office
Refers to the person in charge of a branch office, especially in journalism, government, or corporate contexts.
He was promoted to bureau chief of the newspaper company.
The branch manager announced the opening of a new branch office.
局長 is the head of a main bureau or department, whereas 支局長 is specifically the head of a branch or local office.
Compound of 支局 (branch office) + 長 (head, chief).