ABSTRACT The purpose of this study was to determine the leading economic sector in the city of Padangsidimpuan. This study uses secondary data in the form of time series of the Gross Regional Domestic Product (GDP) of Padangsidimpuan City and North Sumatra Province from 2003 - 2021 which is divided into four periods according to the leadership period of the mayor of Padangsidimpuan. The analyt…