The city of Caldas da Rainha has several named neighbourhoods ("bairros"). Centro (City Centre), in the middle of Nossa Senhora do Pópulo, is the heart of the city. Most of Caldas da Rainha's shops, eateries, businesses, services, government, and transportation are concentrated here. Public squares in the city centre include Praça da República (Republic Square) and Praça 5 de Outubro (5 October Square). Zona Histórica (Historic Zone), in Nossa Senhora do Pópulo adjacent to the city centre, is the oldest part of the city. The neighbourhood includes the thermal hospital, Igreja de Nossa Senhora do Pópulo (Church of Our Lady of the Populace), and Parque D. Carlos I (King Charles I Park).