The municipality of Olza or Cendea de Olza, account with a population of 1379 and it is formed by the places and councils of Olza, Ororbia, Arazuri, Iberian, Asiain, Izcue, Lizasoáin, Izu, Artazcoz. The capital is Ororbia. It has a relief varido. Her subMediterranean vegetation has remained relegated to the areas more had an accident. Two localities in which the companies are located more important are Orcoyen and Ororbia. The products industry metallic and electrical is the most important activity. Others activities of the sector son:la industry of the wood, her food and agriculture, the water distribution and energy, etc. Them more important tertiary activities are: commerce, hotel trade and drinks establishments; education; local administration and order public, etc. The primary sector is the one that less number of persons uses in the municipality.

In Olza The parochial church of San Blas mends his origin to the beginning of the XVIIIth century, with a style Romanesque of transition to the Gothic. The chapel of San Bartolomé is one the ruinous rest which chronology starts of the middle age. The hamlet is provided with a house palaciana very well elegant and ruined others. The management holidays are celebrated on August 26.