Manila, officially the City of Manila, is the capital and second-most populous city of the Philippines, with 43,611.5 inhabitants per square …Manila, officially the City of Manila, is the capital and second-most populous city of the Philippines, with 43,611.5 inhabitants per square kilometer and a population of 1,846,513 people in 2020 after Quezon City. It is the most populous region in the country, one of the most populous urban areas in the world, and one of the wealthiest regions in Southeast Asia.