Alenquer is a Portuguese municipality in the Lisbon District and in the Oeste region. The population in 2011 was 43,267, in an area of 304.…Alenquer is a Portuguese municipality in the Lisbon District and in the Oeste region. The population in 2011 was 43,267, in an area of 304.22 square kilometres. The present Mayor is Pedro Miguel Ferreira Folgado.