Barangay Nonong Casto

Barangay Nonong Casto forms part of Lemery, a municipality in Batangas, and is classified as a mid-sized barangay.

According to the 2020 Census of Population and Housing conducted by the Philippine Statistics Authority, Barangay Nonong Casto had a population of 3,407. This made it the 5th largest of 46 barangays in Lemery by population, placing it among the most populous barangays of the municipality. Residents of Barangay Nonong Casto accounted for approximately 3.66% of the total population of Lemery, which stood at 93,186 in the same census year.

Census comparisons between 2015 and 2020 show Barangay Nonong Casto moving from 3,130 residents to 3,407 residents, an intercensal change of +8.8%. The trajectory indicates a growing community. The Philippine Statistics Authority classifies Barangay Nonong Casto as rural, a designation applied to barangays with lower population density and predominantly non-built-up land use.

Lemery is a municipality comprising 46 barangays, and serves as the governing unit directly responsible for local services in Barangay Nonong Casto, including public health, sanitation, peace and order, and civil registration. Within the wider province of Batangas, which contains 1,078 barangays across its component cities and municipalities, Barangay Nonong Casto ranks 237th by 2020 population. Batangas is classified as a 1st 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.