an Entity references as follows:
Río Piedras Pueblo, (officially just Pueblo, unofficially downtown Río Piedras), is one of 18 barrios in the municipality of San Juan, Puerto Rico. Rio Piedras Pueblo is what used to be the urban center-barrio (downtown district) of the former municipality of Río Piedras until 1951, when the municipality of Rio Piedras was merged with the municipality of San Juan.