In 2017, the registered population in Catalonia was 7,555,830 inhabitants. By place of birth, 4,889,882 inhabitants (64.9%) were born in Catalonia, 1,325,004 inhabitants (17.5%) in the rest of Spain, and 1,330,944 inhabitants (17.6%) abroad, according to statistics from the Municipal Population Register on 1 January 2017.
By counties and Aran, the highest percentages of population born in Catalonia correspond to La Terra Alta (83.0%), Les Garrigues (81.6%), El Priorat (81.0%), El Berguedà (80.7%) and El Moianès (80.6%).The highest percentages of the population born in the rest of Spain were of El Baix Llobregat (22.4%), El Tarragonès (21.5%), Aran (21.0%) and El Baix Penedès (20.5%), while La Terra Alta (5.7%) and Les Garrigues (6.3%) were the counties with the smallest proportion of native population of the rest of Spain.
With regard to the proportion of the population born abroad, the highest figures were recorded in L'Alt Empordà (26.8%) and La Segarra (24.6%), while the lowest figures corresponded to El Berguedà (9.0%), El Ripollès (9.6%), and El Moianès (9.8%).
Statistical treatment of the Municipal Population Register provides population data disaggregated according to basic variables: sex, age, place of birth and nationality. This information is available by provinces, areas within the territorial plan, counties and Aran, municipalities, districts and census sections. On the other hand, it provides information on the total population residing in Catalonia for the different population entities provided by the Statistical Nomenclature of Population Entities in Catalonia.
The source of this data is the Municipal Population Register on January 1, which is the administrative register that accounts for the residents of a municipality and constitutes proof of their residence in said municipality. Its formation, maintenance and management is the responsibility of each respective local council. The INE carries out the coordination and purification work of the municipal registers.