Hatillo, like several other municipalities on the island, experienced boundary changes from the 1902 municipality consolidation law (Consolidación de Ciertos Términos Municipales de Puerto Rico) in which Hatillo was annexed temporarily into neighboring Camuy. Three years later the territorial legislature approved the reformation of Hatillo as a separate municipality (independent town) from Camuy in 1905. In 1910, Barrio Pueblo (rural) changed its name to Hatillo barrio (rural). In 1930, Yeguadilla Occidental and Yeguadilla Oriental barrios' names were changed to Buena Vista and Campo Alegre, respectively. As mentioned before, Pajuil barrio disappeared by the 1940 census being divided up between barrios Buena Vista, Naranjito, Corcovado and Campo Alegre. In 1947 the Planning Commission of Puerto Rico issued a new map of Hatillo municipality and its barrios. As a result of this new map, the central town was expanded to include part of Hatillo barrio (rural) and the name of “Corcovados” was changed to "Corcovado”.