Barangay Isok I is a barangay in Boac, Marinduque, in the MIMAROPA (Region IV-B) of the Philippines. Registered under PSGC code 1704001061 with ZIP code 4900, it had a 2020 Census population of 1,199. That makes it the 19th most populous of Boac's 61 barangays (2.2% of the municipal total of 54,365). It sits at about 35.9 m above sea level at coordinates 13.4454, 121.8423.
Overview
Barangay Isok I is a local community situated within Boac, Marinduque. 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 Isok I 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 Isok I is expanding, contracting, or holding steady within Boac, a signal that informs housing demand, school-age population, and the delivery of local public services.
| Census Date | Population | Growth | Net |
|---|---|---|---|
| 1990 May 1 | 941 | — | — |
| 1995 Sep 1 | 1,001 | +1.16% | 60 |
| 2000 May 1 | 1,226 | +4.44% | 225 |
| 2007 Aug 1 | 1,292 | +0.73% | 66 |
| 2010 May 1 | 1,236 | -1.6% | -56 |
| 2015 Aug 1 | 1,277 | +0.62% | 41 |
| 2020 May 1 | 1,199 | -1.32% | -78 |
Age Distribution (2015 Census)
The age profile of Barangay Isok I 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 Boac.
| Age Group | Population | Share |
|---|---|---|
| Under 1 | 16 | 1.25% |
| 1 to 4 | 76 | 5.95% |
| 5 to 9 | 129 | 10.1% |
| 10 to 14 | 139 | 10.88% |
| 15 to 19 | 150 | 11.75% |
| 20 to 24 | 89 | 6.97% |
| 25 to 29 | 91 | 7.13% |
| 30 to 34 | 78 | 6.11% |
| 35 to 39 | 90 | 7.05% |
| 40 to 44 | 80 | 6.26% |
| 45 to 49 | 85 | 6.66% |
| 50 to 54 | 68 | 5.32% |
| 55 to 59 | 44 | 3.45% |
| 60 to 64 | 44 | 3.45% |
| 65 to 69 | 41 | 3.21% |
| 70 to 74 | 25 | 1.96% |
| 75 to 79 | 15 | 1.17% |
| 80 and over | 17 | 1.33% |
Young population (0-14) · 28.19%
Working-age population (15-64) · 64.13%
Older population (65+) · 7.67%
Household Trends
Household formation in Barangay Isok I 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 Boac.
| Census Date | Households | Avg. Size |
|---|---|---|
| 1990 May 1 | 189 | 4.92 |
| 1995 Sep 1 | 200 | 4.91 |
| 2000 May 1 | 236 | 5.17 |
| 2007 Aug 1 | 254 | 5.05 |
| 2010 May 1 | 264 | 4.68 |
| 2015 Aug 1 | 240 | 5.23 |
Location & Environment
Geographic coordinates, comparative elevation, and environmental risk profile.
Relative rank among Boac's barangays by 2020 population.
Elevation profile, compared to the 28.2 m municipal median.
Barangay Isok I is located at approximately 13.4454, 121.8423 (13°26'43" N, 121°50'32" E) on Luzon , roughly 35.9 meters above sea level.
Hazard Profile & Risk Context
MIMAROPA is exposed to several tropical cyclones each season, less often than the eastern and northern seaboards.
ModerateMIMAROPA has moderate seismic exposure from regional fault systems, with occasional felt earthquakes.
ModerateLocalized 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 Isok I in municipality of Boac, province of Marinduque 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 Boac.
Nearest Barangays
Regional Culinary Highlights
A massive, pizza-sized rice cake baked over coconut husks; the "lalaki" (male) refers to the inclusion of eggs in the re...
Miki MarinduqueFresh, locally made firm egg-flour noodles, celebrated for their unique bite and used in hearty, vegetable-rich soups.
Uraro CookiesDelicate, flower-shaped cookies made from arrowroot flour; famous for their powdery, melt-in-the-mouth texture.
Dinilawang ManokChicken simmered in a turmeric (dilaw) and coconut milk base, resulting in a vibrant yellow, creamy stew.
Frequently Asked Questions
Where is Barangay Isok I located?
Barangay Isok I is a barangay in Boac, Marinduque, in the MIMAROPA (Region IV-B) of the Philippines. Registered under PSGC code 1704001061 with ZIP code 4900, it had a 2020 Census population of 1,199. That makes it the 19th most populous of Boac's 61 barangays (2.2% of the municipal total of 54,365). It sits at about 35.9 m above sea level at coordinates 13.4454, 121.8423.
What is the population of Barangay Isok I?
1,199 as of the 2020 Census, the 19th largest of Boac's 61 barangays (2.2% of the municipal total).
What is the PSGC code of Barangay Isok I?
The PSGC code is 1704001061, a nine-digit identifier in the PSA classification.
What is the ZIP code of Barangay Isok I?
ZIP 4900, covering Boac and its barangays.
How many barangays does Boac have?
61 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.