A principios de siglo contaba la Tierra de Ayala con unos 6.000 habitantes. En 1950 se elevaban ya a 7.355, y en 1966 a 9.368 h. de los cuales 4.780 corresponden a Amurrio, 2.792 a Ayala, I.083 a Lezama y 713 a Oquendo.
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