Antonio Cluster, and Western Cluster. As of June 30, 2021, the following barangays are considered urban: Alibagu, Bagumbayan, Baligatan, Calamagui 1st, Calamagui 2nd, Guinatan, Imelda Bliss Village, Marana I, Osmeña, San Vicente and Santa Barbara. By definition, Santa Isabel Sur is also considered urban barangay due to having more than five thousand population. Land Of the total 1,166.26 km2 land area of Ilagan; 31% are agricultural, 36% are forest areas and the remaining 33% are built-up areas and open grassland areas that are available for industrial, commercial and residential uses. Of all cities in the country, Ilagan ranks as the top producer of corn. As an agriculture-based city, it produces ample supply of corn, rice, vegetables and legumes. Fruits like the banana are year-round products especially in the mountainous areas of the city. Ilagan also produces seasonal fruits such as mangoes and pomelo. The Cagayan Valley Research Center (CVRC) is the primary plant breeding institution in Region 02. It is located in barangay San Felipe along National Highway. Ilagan has rich forest resources. Hectares of forest land are strictly protected by authorities like the Department of Environment and Natural Resources (DENR), several NGOs and the Local Government Unit. Climate Ilagan has a tropical savanna climate (Köppen Aw) with consistently hot temperatures year-round, a dry season from January to April and a wet season from May to December. Demographics Population The rapid increase of population in Ilagan is attributed to the current growth of economic activities specially in the sectors of Commerce, Industry, Agriculture and Housing. Ilagan is one of the 145 emerging cities in the Philippines with more than 100,000 residents. Statistics from the Philippine Statistics Authority show that Ilagan had a population 131,24311 in 2007, which increased to 135,174 people in the 2010 census making Ilagan as the most populous city in the province of Isabela and the second in Cagayan Valley after Tuguegarao. In the 2020 census, the population of Ilagan, was 158,218 people, with a density of . Ethnicity Ilagueños today reflects a combination of indigenous, Chinese and Hispanic descent. The core community was composed of tribes notably the Agta, Ibanag, Gaddang, Yogad, and Kalinga which mirrors the habitation of the Philippines believed to have started 26,000 years ago with various strains of Aetas, then Indonesians coming 5,000 years ago and the Malays in droves starting 200 years B.C. up to 1500 A.D. Trade and cultural relations