Barangay San Isidro

Barangay San Isidro forms part of Santa Maria, a municipality in Romblon, and is classified as a small barangay.

According to the 2020 Philippine census, Barangay San Isidro had a population of 570. This made it the 6th largest of 6 barangays in Santa Maria by population, placing it among the smaller barangays of the municipality. Residents of Barangay San Isidro accounted for approximately 6.34% of the total population of Santa Maria, which stood at 8,989 in the same census year.

The barangay recorded 568 residents in the 2015 intercensal count and 570 residents in the 2020 Census — a net change of +0.4%, consistent with a slowly expanding settlement. Barangay San Isidro is officially classified as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Santa Maria is a municipality comprising 6 barangays, and serves as the governing unit directly responsible for local services in Barangay San Isidro, 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 San Isidro ranks 184th 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.

Like every Philippine barangay, Barangay San Isidro is led by an elected Punong Barangay (barangay captain) supported by seven Sangguniang Barangay members (kagawads), an SK Chairperson, a Barangay Secretary, and a Barangay Treasurer. The next Barangay and Sangguniang Kabataan Elections (BSKE) are scheduled for Monday, November 2, 2026, with officials serving four-year terms under Republic Act No. 12232.