Barangay Mahabang Baybay

Classified as a mid-sized barangay, Barangay Mahabang Baybay is one of the administrative divisions of San Agustin in Romblon, MIMAROPA Region, Philippines.

According to the 2020 Philippine census, Barangay Mahabang Baybay had a population of 2,347. This made it the 3rd largest of 15 barangays in San Agustin by population, placing it in the upper half of the municipality. Residents of Barangay Mahabang Baybay accounted for approximately 9.73% of the total population of San Agustin, which stood at 24,115 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Mahabang Baybay moving from 2,013 residents to 2,347 residents, an intercensal change of +16.6%. The trajectory indicates a growing community. Barangay Mahabang Baybay is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

San Agustin is a municipality comprising 15 barangays, and serves as the governing unit directly responsible for local services in Barangay Mahabang Baybay, including public health, sanitation, peace and order, and civil registration. Within the wider province of Romblon, which contains 219 barangays across its component cities and municipalities, Barangay Mahabang Baybay ranks 27th by 2020 population. Romblon is classified as a 3rd by the Bureau of Local Government Finance, a category that reflects the province's annual regular income.

The barangay's legislative and executive affairs are handled by a Punong Barangay and the Sangguniang Barangay, elected nationwide during the Barangay and SK Elections. The next BSKE is scheduled for Monday, November 2, 2026, following the synchronized election schedule set by COMELEC Resolution No. 11191.