Isabela

Summary data
Map of the Philippines highlighting Isabela
Typeprovince
Island groupLuzon
RegionCagayan Valley (Region II)
Cities3
Municipalities34
Barangays1,055
Coastal/Landlockedcoastal
Marine waterbodiesPhilippine Sea
Area (2013)13,102.05 km2 (5,058.73 sq mi)
Population (2020)1,697,050
Density (2020)130 / km2 (335 / sq mi)

Isabela is a province in the Philippines situated in the Cagayan Valley region occupying the northeastern section of Luzon. Its capital is the City of Ilagan.

The province has a land area of 13,102.05 square kilometers or 5,058.73 square miles. Its population as determined by the 2020 Census was 1,697,050. This represented 46.04% of the total population of the Cagayan Valley region, 2.73% of the overall population of the Luzon island group, or 1.56% of the entire population of the Philippines. Based on these figures, the population density is computed at 130 inhabitants per square kilometer or 335 inhabitants per square mile.

Map

Isabela is bordered, clockwise from the North, by Cagayan, the Philippine Sea, Aurora, Quirino, Nueva Vizcaya, and Ifugao, Mountain Province, Kalinga.

details
Map of the Philippines with Isabela highlighted in redMap of Isabela showing its component cities and municipalitiesAliciaAngadananAuroraBenito SolivenBurgosCabaganCabatuanCauayanCordonDelfin AlbanoDinapigueDivilacanEchagueGamuIlaganJonesLunaMaconaconMalligNaguilianPalananQuezonQuirinoRamonReina MercedesRoxasSan AgustinSan GuillermoSan IsidroSan ManuelSan MarianoSan MateoSan PabloSanta MariaSantiagoSanto TomasTumauini

Local government units

Isabela has 34 municipalities and 3 cities. The total number of barangays in the province is 1,055.

details
Local government units of Isabela
NameTypePopulation (2020)Population (2015)Annual Population Growth Rate (2015‑2020)Area (2013), in km2Density (2020), per km2Brgy count
Aliciamunicipality73,87471,5040.69%154.1047934
Angadananmunicipality44,97743,0610.92%204.4022059
Auroramunicipality36,62135,0170.95%115.5631733
Benito Solivenmunicipality29,75229,6240.09%197.5215129
Burgosmunicipality26,04023,7841.93%73.1035614
Cabaganmunicipality53,89750,1741.52%430.4012526
Cabatuanmunicipality39,99039,4130.31%72.0055522
Cauayancity (CC)143,403129,5232.17%336.4042665
Cordonmunicipality46,47742,9261.69%144.0032326
Delfin Albanomunicipality29,92826,6142.50%189.0015829
Dinapiguemunicipality5,8215,0053.23%1,031.9366
Divilacanmunicipality5,8275,6870.51%889.49712
Echaguemunicipality88,41079,0942.37%648.3813664
Gamumunicipality30,65529,9040.52%129.4023716
Ilagancity (CC), capital158,218145,5681.77%1,166.2613691
Jonesmunicipality45,62845,666-0.02%670.146842
Lunamunicipality20,69719,3261.45%44.9446119
Maconaconmunicipality3,9774,253-1.40%538.66710
Malligmunicipality32,20830,4591.18%158.5520318
Naguilianmunicipality33,78831,9021.22%169.8119925
Palananmunicipality17,68417,2600.51%880.242017
Quezonmunicipality27,03725,8600.94%207.0713115
Quirinomunicipality25,02324,5010.44%126.2019821
Ramonmunicipality56,52352,7071.48%135.1741819
Reina Mercedesmunicipality27,90026,9980.69%57.1448820
Roxasmunicipality65,83961,7731.35%139.9547026
San Agustinmunicipality22,09622,880-0.73%278.407923
San Guillermomunicipality20,91520,2000.74%457.354626
San Isidromunicipality27,04424,8611.79%71.9037613
San Manuelmunicipality34,08531,8961.41%112.7730219
San Marianomunicipality60,12455,3701.75%1,459.164136
San Mateomunicipality66,66364,5050.70%242.1027533
San Pablomunicipality26,32025,3840.77%637.904117
Santa Mariamunicipality25,75825,3820.31%124.9020620
Santiagocity (ICC)148,580134,8302.07%255.5058237
Santo Tomasmunicipality24,52823,0051.36%80.5830427
Tumauinimunicipality70,74367,6500.95%471.6815046
Isabela Total1,697,0501,593,5661.33%13,102.051301,055

Economy

The annual regular revenue of Isabela for the fiscal year of 2016 was ₱2,637,950,546.97.

Historical annual regular income data

Annual regular income of Isabela (2009‑2016)
Fiscal YearAnnual Regular IncomeChange
20091,393,109,090.76–
20101,498,735,350.477.58%
20111,730,610,652.4215.47%
20121,632,559,738.90-5.67%
20131,772,857,201.768.59%
20142,019,452,462.1413.91%
20152,303,660,681.4814.07%
20162,637,950,546.9714.51%

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

Population by age group

According to the 2015 Census, the age group with the highest population in Isabela is 5 to 9, with 164,851 individuals. Conversely, the age group with the lowest population is 80 and over, with 12,738 individuals.

Age distribution

Population of Isabela by age group (2015 census)
Age groupPopulation (2015)Age group percentage
Under 132,0332.01%
1 to 4133,9978.41%
5 to 9164,85110.34%
10 to 14154,3989.69%
15 to 19150,8599.47%
20 to 24149,7219.40%
25 to 29131,8378.27%
30 to 34115,0867.22%
35 to 39110,0246.90%
40 to 4496,3046.04%
45 to 4988,4925.55%
50 to 5477,2594.85%
55 to 5963,1253.96%
60 to 6447,3892.97%
65 to 6931,5101.98%
70 to 7419,3871.22%
75 to 7914,5560.91%
80 and over12,7380.80%
Total1,593,566100.00%
  • Youth Dependency Ratio: 47.11
  • Old Age Dependency Ratio: 7.59
  • Total Dependency Ratio: 54.7
  • Median Age: 25.41

Historical population

The population of Isabela grew from 76,431 in 1903 to 1,697,050 in 2020, an increase of 1,620,619 people over the course of 117 years. The latest census figures in 2020 denote a positive annualized growth rate of 1.33%, or an increase of 103,484 people, from the previous population of 1,593,566 in 2015.

Trends in population growth

Population of Isabela (1903‑2020)
Census datePopulationAnnualized Growth Rate
76,431–
112,9602.50%
219,8643.39%
264,4951.91%
442,0624.62%
648,1233.81%
730,3862.43%
870,6043.57%
1,080,3412.18%
1,160,7211.35%
1,287,5752.25%
1,401,4951.18%
1,489,6452.25%
1,593,5661.29%
1,697,0501.33%

The total number of registered voters or electorate in Isabela for the year 2019 was 1,050,681.

National roads

As of December 2016, the National Roads in Isabela are:

Primary Roads

  • Cauayan-Cabatuan Road
  • Daang Maharlika (LZ)
  • Santiago-Tuguegarao By-Pass Road
  • Santiago-Tuguegarao Road

Secondary Roads

  • Cabagan-Santa Maria Road
  • Cordon-Diffun Road
  • Junction National-Potia Road

Tertiary Roads

  • Abbut-Agbannawag Road
  • Alicia-San Mateo Road
  • Burgos-Gen. Aguinaldo (NIA) Road
  • Calamagui-Ilagan Road
  • Cauayan-Poblacion Road
  • Echague-Poblacion Road
  • Gamu-Roxas Road
  • Ilagan-Bigao-Palanan Road
  • Ilagan-Delfin Albano-Mallig Road
  • Junction Delfin Albano Road
  • Junction Ipil-Quirino Boundary Road
  • Junction National-Calamagui Road
  • Junction National-Santa Victoria Road
  • Naguilian-San Mariano Road
  • Old CVR-Cabagan Road
  • Old CVR-San Pablo Road
  • Santiago-Baluarte-Quirino Boundary

Notes

  1. Unless otherwise specified, population count (excluding percentages) and land area figures are derived from the Philippine Statistics Authority.
  2. Data on registered voters is from the Commission on Elections.
  3. Maps utilize OpenStreetMap data available under the Open Data Commons Open Database License.
  4. Data on National Roads is from the Department of Public Works and Highways.
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