a department in France; the northeastern part of the Paris agglomeration. Area, 236sq km. Population, 1,322,000 (1975). The capital of Seine-Saint-Denis is Bobigny. Approximately 37 percent of the work force is employed in industry (1968). The machine-building industry produces motor vehicles, aircraft, electronic and electrical equipment, machine tools, railroad equipment, and river vessels. The chemical industry produces sulfuric acid, fertilizers, plastics, dyes, pharmaceuticals, and perfumes. There are also metallurgical conversion, glass-making, and food-processing enterprises. A significant portion of the population is employed in the service industry.