Alentejo is the biggest region in Portugal, occupying an area of 27,332.4 km2, with 503,507 inhabitants distributed in 4 sub-regions: Alentejo Litoral with 94,904, Alto Alentejo with 115,421, Alentejo Central with 168,116 and Bajo Alentejo with 125,066 inhabitants.

Território, populaçao e Estrutura territorial

It is the Portuguese region with the lowest population density, a little less than 19 inhab/km2, compared to the national average of 115 inhab/km2. This situation is the result of specific historical factors such as free range agriculture, and has produced this disperse population.

The resident population of Alentejo is around 4.7% of the population of Portugal, distributed over an area equivalent to 30% of the country. .

Administratively, Alentejo is comprised of 47 district councils (concelhos), 301 local or parish councils (freguesias) and 947 settlements, of which 14 are cities and 46 are towns.