In 1926, another company, this time of the textile sector, called "La Seda de Barcelona", built a factory in the town. That caused the final spurt of growth of El Prat. With the immigration of people from the south of Spain (mostly Andalusia and Extremadura), the town almost doubled in size by 1930, and again by 1950, and then increased its size threefold in 1970 with the creation of the neighborhoods of Sant Cosme, Sant Jordi and La Granja, built to be the home of these immigrants. Finally, with the next expansion, the population doubled in size once again, although has now reached a period of stability.