Atxondo is a municipality located in the province of Biscay, in the Basque Country, Spain. Atxondo is part of the comarca of Durangaldea and h…Atxondo is a municipality located in the province of Biscay, in the Basque Country, Spain. Atxondo is part of the comarca of Durangaldea and has a population of 1,447 inhabitants as of 2007 according to the Spanish National Statistics Institute.