A quick look at the Spanish electoral system

SPAIN has a multi-party system at both the national and regional level. Nationally there are two dominant political parties, the left-leaning PSOE and right-wing PP, which make it extremely difficult for any other formation or coalition to achieve electoral majorities.

Regional parties can be strong in autonomous communities like Catalonia and the Basque Country, and are often essential for national government coalitions.

The number of seats in each town council is determined by the population count. According to municipal electoral law, the population-seat relationship in each municipality is to be established on the following scale:

Additionally, for populations greater than 100,000, one seat is to be added per each 100,000 inhabitants or fraction, according to the most updated census data, and adding one more seat if the resulting seat count gives an even number.