Barangay San Isidro Sur is a barangay in Lagonoy, Camarines Sur, in the Bicol Region (Region V) of the Philippines. Registered under PSGC code 0501717028 with ZIP code 4425, it had a 2020 Census population of 670. That makes it the 32nd most populous of Lagonoy's 38 barangays (1.2% of the municipal total of 57,044). It sits at about 17.5 m above sea level at coordinates 13.7333, 123.5196.
Overview
Barangay San Isidro Sur is a local community situated within Lagonoy, Camarines Sur. Serving as the primary administrative building block of local governance, it connects local residents directly to municipal public services, community development, and regional infrastructure networks.
Demographics & Population Trends
Insights into growth, age distributions, and household composition.
Historical Population Growth
Barangay San Isidro Sur is tracked across every census round conducted by the Philippine Statistics Authority. The table and bar chart below trace its recorded population from 1990 to 2020, together with the annualized growth rate and net population change between counts. Read side by side, they show whether San Isidro Sur is expanding, contracting, or holding steady within Lagonoy, a signal that informs housing demand, school-age population, and the delivery of local public services.
| Census Date | Population | Growth | Net |
|---|---|---|---|
| 1990 May 1 | 794 | — | — |
| 1995 Sep 1 | 659 | -3.43% | -135 |
| 2000 May 1 | 724 | +2.04% | 65 |
| 2007 Aug 1 | 711 | -0.25% | -13 |
| 2010 May 1 | 753 | +2.11% | 42 |
| 2015 Aug 1 | 733 | -0.51% | -20 |
| 2020 May 1 | 670 | -1.87% | -63 |
Age Distribution (2015 Census)
The age profile of Barangay San Isidro Sur is drawn from the 2015 Census and grouped into five-year age bands. The table and bar chart below show how residents split across the young dependent population, the working-age population, and older residents, the balance that drives the local dependency ratio and median age. A community weighted toward working-age adults points to a wider labor force, while a broad base of children signals future demand for schools, health centers, and youth programs in Lagonoy.
| Age Group | Population | Share |
|---|---|---|
| Under 1 | 15 | 2.05% |
| 1 to 4 | 49 | 6.68% |
| 5 to 9 | 97 | 13.23% |
| 10 to 14 | 80 | 10.91% |
| 15 to 19 | 57 | 7.78% |
| 20 to 24 | 47 | 6.41% |
| 25 to 29 | 38 | 5.18% |
| 30 to 34 | 56 | 7.64% |
| 35 to 39 | 44 | 6% |
| 40 to 44 | 34 | 4.64% |
| 45 to 49 | 46 | 6.28% |
| 50 to 54 | 22 | 3% |
| 55 to 59 | 23 | 3.14% |
| 60 to 64 | 34 | 4.64% |
| 65 to 69 | 32 | 4.37% |
| 70 to 74 | 23 | 3.14% |
| 75 to 79 | 18 | 2.46% |
| 80 and over | 18 | 2.46% |
Young population (0-14) · 32.88%
Working-age population (15-64) · 54.71%
Older population (65+) · 12.41%
Household Trends
Household formation in Barangay San Isidro Sur is measured each census through the number of households and the average household size. The table and bar chart below plot how the household count has moved across the years. A rising number of households alongside a falling average size usually reflects smaller family units and new home formation, while a steady average size suggests multigenerational living remains common. These figures help gauge local housing stock, utility demand, and the pace of residential development in Lagonoy.
| Census Date | Households | Avg. Size |
|---|---|---|
| 1990 May 1 | 136 | 5.84 |
| 1995 Sep 1 | 134 | 4.92 |
| 2000 May 1 | 145 | 4.99 |
| 2007 Aug 1 | 147 | 4.84 |
| 2010 May 1 | 166 | 4.54 |
| 2015 Aug 1 | 168 | 4.36 |
Location & Environment
Geographic coordinates, comparative elevation, and environmental risk profile.
Relative rank among Lagonoy's barangays by 2020 population.
Elevation profile, compared to the 16.7 m municipal median.
Barangay San Isidro Sur is located at approximately 13.7333, 123.5196 (13°44'00" N, 123°31'11" E) on Luzon , roughly 17.5 meters above sea level.
Hazard Profile & Risk Context
Bicol Region lies along the main track of Pacific tropical cyclones and sees frequent typhoon passage during the June to November season.
HighBicol Region is seismically active, with movement along nearby faults and trenches capable of producing strong earthquakes.
HighLocalized flooding can occur during heavy rainfall, depending on drainage and proximity to rivers and low ground.
ModerateGeneral planning context derived from topographic models. Refer to PHIVOLCS and municipal DRRMO advisories for official disaster risk mapping.
Governance & Administrative Record
Local administration setup and statutory registry parameters.
As the primary administrative tier in the Philippines, Barangay San Isidro Sur in municipality of Lagonoy, province of Camarines Sur is led by an elected Punong Barangay alongside a Sangguniang Barangay composed of seven elected council members. The barangay council oversees neighborhood disputes via the Lupong Tagapamayapa, enacts local ordinances, and maintains peace and public safety.
Official Registry
PSGC Statutory Data Sheet
Surrounding Area & Local Culture
Nearby communities, cultural landmarks, and local services in Lagonoy.
Nearest Barangays
Other Barangays in Lagonoy
Frequently Asked Questions
Where is Barangay San Isidro Sur located?
Barangay San Isidro Sur is a barangay in Lagonoy, Camarines Sur, in the Bicol Region (Region V) of the Philippines. Registered under PSGC code 0501717028 with ZIP code 4425, it had a 2020 Census population of 670. That makes it the 32nd most populous of Lagonoy's 38 barangays (1.2% of the municipal total of 57,044). It sits at about 17.5 m above sea level at coordinates 13.7333, 123.5196.
What is the population of Barangay San Isidro Sur?
670 as of the 2020 Census, the 32nd largest of Lagonoy's 38 barangays (1.2% of the municipal total).
What is the PSGC code of Barangay San Isidro Sur?
The PSGC code is 0501717028, a nine-digit identifier in the PSA classification.
What is the ZIP code of Barangay San Isidro Sur?
ZIP 4425, covering Lagonoy and its barangays.
How many barangays does Lagonoy have?
38 barangays per the PSA PSGC 1Q 2026 release.
Notes & Data Sources
- Administrative boundaries sourced from the PSA PSGC 1Q 2026 dataset release.
- Population figures and geographical metrics are integrated from official PhilAtlas and PSA Census records.