Barcelona is the capital of the autonomous community of Cataluña (Catalunya) and of the province of Barcelona. Per INE's Padrón continuo (table 2861), the municipality of Barcelona had an officially certified population of 1,731,649 as of 1 January 2025 (829,413 men / 902,236 women) — the highest level in nearly forty years. The Ajuntament de Barcelona's own reporting for the same date cited a near-identical 1,732,066 residents, a third consecutive annual increase driven mainly by international migration.
Barcelona is Spain's second-largest city and a distinct relocation draw from Madrid: it combines a Mediterranean coastal setting with a strong tech and creative economy, centered on the 22@ innovation district in Poblenou (a former industrial zone converted since 2000 into a hub for ICT, design, media and biotech companies, home to firms including Amazon, Cisco Systems, Microsoft and Glovo). It is also one of the most internationally diverse cities in Spain: per the Ajuntament de Barcelona's Oficina Municipal de Dades, 26.4% of registered residents held foreign nationality as of 1 January 2025 (a new record, up 5.7% year-on-year), and 35.4% of residents were born outside Spain, representing 182 nationalities. Connectivity is strong — Barcelona-El Prat Airport carried a record 57,483,036 passengers in 2025 (Aena) — and the city sits on Adif's high-speed AVE line linking Madrid to the French border.
Key Facts
Administrative structure: Barcelona is the capital of the autonomous community of Cataluña and of the province of Barcelona (Cataluña comprises four provinces: Barcelona, Girona, Lleida and Tarragona).
Population (city, INE, 1 January 2025): 1,731,649. Metropolitan area (INE, broader statistical delimitation): approximately 5,983,325.
International residents: 26.4% foreign nationality as of 1 January 2025, a historic high (Ajuntament de Barcelona, Oficina Municipal de Dades); over half of foreign-born residents come from the Americas, mostly Latin America.
Economy: Tech and creative-industry hub anchored by the 22@ innovation district in Poblenou, alongside a strong tourism, design and life-sciences base.
Connectivity: Barcelona-El Prat Airport — 57,483,036 passengers in 2025, a record year (+4.4%), per Aena's official 2025 traffic figures; it is Spain's second-busiest airport after Madrid-Barajas. Adif's high-speed AVE network connects Barcelona to Madrid and continues to the French border.
Climate (AEMET, Barcelona Aeropuerto station, 1981-2010 normals, light touch — see the dedicated weather document for detail): Mediterranean coastal climate, milder and wetter than Madrid's interior climate. Annual average temperature 16.1°C, average maximum 20.3°C, average minimum 11.8°C, annual precipitation 588 mm.
Administrative quirk — regional tax agency: Cataluña operates its own regional tax authority, the Agència Tributària de Catalunya (ATC), which manages Cataluña-specific taxes (including property transfer and stamp duty, inheritance and gift tax, and several environmental levies) in addition to the taxes administered by Spain's national tax agency (AEAT). Newcomers dealing with property purchase or inheritance matters in Cataluña will interact with the ATC specifically, not only the national Agencia Tributaria.
Administrative quirk — co-official language: Catalan is co-official with Castilian Spanish throughout Cataluña. Public administration, official notices and many everyday services (schools, some healthcare paperwork, local government forms) commonly operate in Catalan by default, though residents retain the right to be served in Castilian.
Tax note: Cataluña's property transfer tax (ITP) rate differs from Madrid's and Valencia's — see NomadPilot's closing-costs documentation for the current rate rather than re-deriving it here.