The Puerto Rico senatorial districts (Spanish: distritos senatoriales) refers to the electoral districts in which Puerto Rico is divided for the purpose of electing 16 of the 27 members of the Senate of Puerto Rico (with the other 11 being elected at-large). The island is currently divided in eight senatorial districts, each based on a similar number of inhabitants, and comprising one or more representative districts—the electoral districts in which Puerto Rico is divided for the elections of the members of the House of Representatives.[1] American citizens may vote only for the district in which they have declared their residence, and only for up to two senators per district by plurality-at-large.