Caldas da Rainha is the seat of the Comunidade Intermunicipal do Oeste (OesteCIM, Intermunicipal Community of the West). For statistical purposes, Caldas is in the NUTS III Oeste (West) subregion— with OesteCIM—within the NUTS II Centro (Centre) region, which is part of the NUTS I division called Continente (Continental, or Mainland, Portugal). The municipality is part of the Comissão de Coordenação e Desenvolvimento Regional de Lisboa e Vale do Tejo (CCDR LVT, Regional Commission for Coordination and Development of Lisbon and Tagus Valley). Caldas da Rainha belongs to the historical province of Estremadura and to the district of Leiria. In the Roman Catholic Church, the parish of Caldas da Rainha belongs to the Caldas da Rainha - Peniche vicariate of the Patriarchate of Lisbon.