Barcelona's population remained stable throughout 2025, showing a slight decrease of 0.1% and standing at 1,729,963 registered inhabitants. This figure breaks the growth trend of previous years and is attributed by the City Council to low birth rates, an aging population, and a moderation in migratory flows.

The registry study also highlights a progressive aging of residents, with an average age of 44.6 years. Barcelona has reached a new historic high of 1,196 centenarians, eight out of ten being women. The negative balance between births (11,012) and deaths (14,557) in 2025 resulted in a net loss of 3,549 inhabitants.

The proportion of residents born in Barcelona continues to decline, now representing 44.6% of the total, a downward trend observed for over two decades. Conversely, the foreign-born population has slightly increased to 460,409 people (26.6% of the total), maintaining the city's high diversity with residents from 181 nationalities.

Seven out of Barcelona's ten districts saw population decreases, while Ciutat Vella, Nou Barris, and Sant Andreu experienced small increases. Regarding educational attainment, 37.4% of the population aged 16 and over have higher education, with a higher percentage among women (39.6%) and the foreign population (42.7%).