The mayor of the town is Lluïsa Moret Sabidó (Socialists' Party of Catalonia, PSC), and the political composition of the city council seats is as follows: The finding of archaeological remains corresponding to Iberian colonies (VI-I bC) and to the Romans (I-V aC)―a noteworthy Roman bath is located near the river―suggests that Sant Boi was created in pre-Roman times.

The growth continued in the following centuries, giving rise to numerous "masies" (typical Catalan agricultural country houses) near the river and fertile lands.

In the early stages of the 20th century, industry arrived and subsequently flourished in Sant Boi, ranging from brick manufacturing to metalwork.

They were searching for jobs and career opportunities in the city of Barcelona since it was stimulated by the regrowth of Catalan industry in post-war Spain.

Sant Boi is now a town with more than 80,000 inhabitants, with well-established industrial and service sectors, and good cultural and recreational offerings.