The barrios of Puerto Rico are the primary legal divisions of the seventy-eight municipalities of Puerto Rico. Puerto Rico's 78 municipios are divided into geographical sections called barrios (English: "wards") and, as of 2010, there were 902 of them. In the US Census a barrio sometimes includes a division called a or subbarrio. In Puerto Rico, barrios are composed of sectors. The types of sectors, (sectores) may vary, from normally sector to urbanización to reparto to barriada to residencial, among others. History The history of the creation of the barrios of Puerto Rico can be traced to the 19th century, when historical documents first mention them. Historians have speculated that their creation may have been related to the Puerto Rican representation at the Cortes of Cádiz. The names of barrios in Puerto Rico come from various sources, mostly from Spanish or Indian origin. One barrio in each municipality (except for Florida, Ponce, and San Juan) is identified as the barrio-pueblo. It is differentiated from other barrios in that it is the historical center of the municipality and the area that represented the seat of the municipal government at the time Puerto Rico formalized the municipio and barrio boundaries in the late 1940s. From time to time barrios are created, broken up, or merged. The downtown district of each town was called pueblo until 1990, when they began to be referred to as barrio-pueblo in the US Census, and contains the plaza, municipal buildings and a Roman Catholic church. In 1832 there were 490, in 1878 there were 841, in 1990 there were 899 barrios. Classification The United States Census Bureau recognizes 902 barrios in Puerto Rico. The US classifies barrios as minor civil divisions for statistical purposes. As components of each municipality, each municipality has one or more barrios. Every municipality has at least one barrio called barrio Pueblo which is home to the largest urban area of the municipality, and the political seat of the municipality. Most municipalities have a single barrio named barrio Pueblo while others, most prominently the larger municipalities like the municipality of Ponce, may have a barrio Pueblo that is made of several barrios. Florida is the municipality with the fewest barrios, while Ponce, at 31, has the most. The US Census Bureau further breaks down some barrios in Puerto Rico into subbarrios. One such example is Santurce (in San Juan) which has 40 subbarrios.