Banabuiú, Boa Vista do Tupim, Canapi, and Plácido de Castro are Brazilian cities with populations around 18,000 in 2009. Banabuiu in the northeastern state of Ceará has a population of 18,388. Boa Vista do Tupim in the northeastern state of Bahia has 18,298. Canapi in the northeastern state of Alagoas has 18,397. Plácido de Castro in the western state of Acre has 18,235.