- Sumaré is a city in the state of São Paulo, Brazil. It is located within the metropolitan region of Campinas, one of the most developed and populated areas in the country. Sumaré has a population of approximately 285,000 people and is known for its industrial and agricultural activities. It is also home to several parks, such as the Parque das Águas and Parque Itamarati, which attract visitors for leisure activities.