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Mar Azul is a coastal residential community in Hatillo barrio-pueblo, Puerto Rico. The Hatillo territorial plan lists the community, and Municipal Resolution No. 39 identifies Avenida El Malecón in Urbanización Mar Azul as a coastal-erosion priority. Its homes use lettered block addresses, and its 203 residential lots are connected by a small internal street grid. The community includes 204 recorded properties. San Ramón and Carrizales are separate neighboring communities. Archived property records report homes built in 1980 and 1982, supporting an estimated development start around 1980. Current access controls, association fees, and shared amenities remain unverified.