Like all municipalities of Puerto Rico, San Sebastián is subdivided into administrative units called barrios, which are roughly comparable to minor civil divisions, (and means wards or boroughs or neighborhoods in English). The barrios and subbarrios, in turn, are further subdivided into smaller local populated place areas/units called sectores (sectors in English). The types of sectores may vary, from normally sector to urbanización to reparto to barriada to residencial, among others.