San Isidro, Province of Isabela

Summary data
Typemunicipality
Island groupLuzon
RegionCagayan Valley (Region II)
ProvinceIsabela
Barangay count13
Postal code3310
Coastal/Landlockedlandlocked
Marine waterbodiesnone (landlocked)
Philippine major island(s)Luzon
Area (2013)71.90 km2 (27.76 sq mi)
Population (2020)27,044
Density (2020)376 / km2 (974 / sq mi)
Coordinates16° 44' North, 121° 38' East (16.7343, 121.6337)
Estimated elevation above sea level80.9 meters (265.5 feet)

San Isidro is a landlocked municipality in the coastal province of Isabela.

The municipality has a land area of 71.90 square kilometers or 27.76 square miles which constitutes 0.55% of Isabela's total area. Its population as determined by the 2020 Census was 27,044. This represented 1.59% of the total population of Isabela province, or 0.73% of the overall population of the Cagayan Valley region. Based on these figures, the population density is computed at 376 inhabitants per square kilometer or 974 inhabitants per square mile.

Barangays

San Isidro has 13 barangays as shown in the following table.

Demographic profile of barangays
Local government units of San Isidro
BarangayPopulation percentage (2020)Population (2020)Population (2015)Change (2015‑2020)Annual Population Growth Rate (2015‑2020)
Camarag6.00%1,6231,672-2.93%-0.62%
Cebu10.68%2,8882,7534.90%1.01%
Gomez11.26%3,0452,51720.98%4.09%
Gud6.36%1,7201,6077.03%1.44%
Nagbukel7.28%1,9701,79010.06%2.04%
Patanad2.74%7417321.23%0.26%
Quezon14.28%3,8633,49910.40%2.10%
Ramos East6.76%1,8291,56317.02%3.36%
Ramos West7.85%2,1231,89112.27%2.47%
Rizal East6.86%1,8541,948-4.83%-1.04%
Rizal West3.96%1,07297310.17%2.06%
Victoria7.08%1,9161,7857.34%1.50%
Villaflor8.87%2,4002,13112.62%2.53%
San Isidro Total27,04424,8618.78%1.79%

Economy

The annual regular revenue of San Isidro for the fiscal year of 2016 was 67,811,751.71.

details
Annual regular income of San Isidro (2009‑2016)
Fiscal YearAnnual Regular IncomeChange
2009
2010
201141,039,702.42
2012
201347,494,771.43
201453,974,891.0013.64%
201561,297,227.2213.57%
201667,811,751.7110.63%

End notes:

  • Annual Regular Income = Locally Sourced Revenue + Internal Revenue Allotment (IRA) Current Year + Other Shares from National Tax Collection
  • Locally Sourced Revenue = Real Property Tax (General Fund) + Tax on Business + Other Taxes + Regulatory Fees + Service/User Charges + Receipts from Economic Enterprises

Demographics

Households

The household population of San Isidro in the 2015 Census was 24,861 broken down into 5,831 households or an average of 4.26 members per household.

details
Number of households in San Isidro (1990‑2015)
Census dateHousehold populationNumber of householdsAverage household size
14,4442,8265.11
16,0433,2814.89
18,6023,9104.76
21,3874,7044.55
22,7585,1574.41
24,8615,8314.26

Population by age group

According to the 2015 Census, the age group with the highest population in San Isidro is 5 to 9, with 2,533 individuals. Conversely, the age group with the lowest population is 75 to 79, with 191 individuals.

details
Population of San Isidro by age group (2015 census)
Age groupPopulation (2015)Age group percentage
Under 14781.92%
1 to 42,1388.60%
5 to 92,53310.19%
10 to 142,2409.01%
15 to 192,2989.24%
20 to 242,3209.33%
25 to 292,0128.09%
30 to 341,8127.29%
35 to 391,8217.32%
40 to 441,5356.17%
45 to 491,5206.11%
50 to 541,1644.68%
55 to 591,0554.24%
60 to 647783.13%
65 to 694911.97%
70 to 742821.13%
75 to 791910.77%
80 and over1930.78%
Total24,861100.00%
  • Youth Dependency Ratio: 45.29
  • Old Age Dependency Ratio: 7.09
  • Total Dependency Ratio: 52.38
  • Median Age: 26.05

Historical population

The population of San Isidro grew from 8,384 in 1970 to 27,044 in 2020, an increase of 18,660 people over the course of 50 years. The latest census figures in 2020 denote a positive growth rate of 1.79%, or an increase of 2,183 people, from the previous population of 24,861 in 2015.

details
Population of San Isidro (1903‑2020)
Census datePopulationGrowth rate
8,384
9,7373.05%
11,5273.43%
14,4442.28%
16,0431.99%
18,6033.23%
21,3871.94%
22,7582.29%
24,8611.70%
27,0441.79%

The total number of registered voters or electorate in San Isidro for the year 2019 was 15,506, broken down into 7,843 males and 7,663 females.

Location

The municipal center of San Isidro is situated at approximately 16° 44' North, 121° 38' East, in the island of Luzon. Elevation at these coordinates is estimated at 80.9 meters or 265.5 feet above mean sea level.

Distances

Based on the great-circle distance (the shortest distance between two points over the surface of the Earth), the cities closest to San Isidro are Santiago, Isabela, Cauayan, Isabela, Ilagan, Isabela, Tabuk, Kalinga, Tuguegarao, Cagayan, and Baguio. The nearest municipalities are Echague, Isabela, Alicia, Isabela, Ramon, Isabela, Angadanan, Isabela, San Mateo, Isabela, and Cordon, Isabela. Its distance from the national capital is 247.11 kilometers (153.55 miles). The following list delineates such distance measurements.

great-circle distance

Nearest towns

  • Echague, Isabela, 6.61 kilometers (4.11 miles) to the East‑Southeast (S64°E)
  • Alicia, Isabela, 9.31 kilometers (5.79 miles) to the East‑Northeast (N58°E)
  • Ramon, Isabela, 10.91 kilometers (6.78 miles) to the West‑Northwest (N61°W)
  • Angadanan, Isabela, 13.35 kilometers (8.29 miles) to the East (N79°E)
  • San Mateo, Isabela, 16.71 kilometers (10.38 miles) to the North‑Northwest (N14°W)
  • Cordon, Isabela, 18.22 kilometers (11.32 miles) to the West‑Southwest (S68°W)

Nearest cities

  • Santiago, Isabela, 9.96 kilometers (6.19 miles) to the West‑Southwest (S58°W)
  • Cauayan, Isabela, 26.77 kilometers (16.63 miles) to the Northeast (N34°E)
  • Ilagan, Isabela, 53.35 kilometers (33.15 miles) to the North‑Northeast (N32°E)
  • Tabuk, Kalinga, 83.41 kilometers (51.83 miles) to the North‑Northwest (N12°W)
  • Tuguegarao, Cagayan, 97.84 kilometers (60.80 miles) to the North (N7°E)
  • Baguio, 115.75 kilometers (71.92 miles) to the West‑Southwest (S72°W)

Distance from Manila: 247.11 kilometers (153.55 miles) to the South‑Southwest (S16°W)

Notes

  1. Unless otherwise specified, population count (excluding percentages), household data, and land area figures are derived from the Philippine Statistics Authority.
  2. Data on registered voters is from the Commission on Elections.
  3. Data on annual regular income is from the Bureau of Local Government Finance, Department of Finance
  4. Postal code information is from the Philippine Postal Corporation.
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