In 1790, the seat was established at the place it now occupies.

The seat of both schools was established in a new primary school Łazy building.

The county's seat and its court of general sessions were established at Campobello.

The seat of the provincial government was established in Bongao.

The seat of the Order was established in Mértola until 1316.

In 1591 a hospital was founded, and the seat of a starosta was established here.

In 1793, the seat of the civil affairs was established in the Poblacion.

This rural seat was first established for the 1893 election.

On that occasion the seats of nine other agencies were also established.

The current seat was established in 2002 although several previous seats held the same name.