San Juan, officially the City of San Juan, is a highly urbanized city in the National Capital Region of the Philippines. According to the 2020 census, it has a population of 126,347 people. It is geographically located at Metro Manila's approximate center and is also the country's smallest city in terms of land area. The city is known historically for the site of the first battle of the Katipunan, the organization which led the 1896 Philippine Revolution against the Spanish Empire.