Senatorial constituencies

The Senate comprises 50 members. Following a 2018 reform, each of Chile's 16 regions now constitutes a senatorial constituency, with each electing between two and five senators.

Historical senatorial constituencies (1990-2018)

Before the 2018 reform, Chile used 19 senatorial constituencies. Most regions formed a single constituency, but five larger regions (Valparaíso, Santiago, Maule, Biobío, and La Araucanía) were each split into two. Each

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