The population with a high number of indigenous citizens of Quechuan and Aymara descent mostly lived or still lives in humble houses with earthen floor, adobe walls, roofed with thatched material.

Most of the people in the municipality are of Aymara descent known as Carangas.

Of Quechua and Aymara descent, he was a student at the School of Sociology of the Catholic University until 1970.

Castilla was born in Tarapacá (then part of the Viceroyalty of Peru), the second son of Pedro Castilla, of Spanish-Argentine origin, and Juana Marquezado de Romero, who was of part Aymara descent.

The people are predominantly indigenous citizens of Aymara descent (95.04%).