Caloocan, officially the City of Caloocan, is a highly urbanized city in Metro Manila, Philippines. According to the 2020 census, it has a populatio…Caloocan, officially the City of Caloocan, is a highly urbanized city in Metro Manila, Philippines. According to the 2020 census, it has a population of 1,661,584 people making it the fourth-most populous city in the Philippines.