Populations of military and naval reserves are not included from 1899 through 1940.
Puerta de Tierra conforms the eastern portion of the Islet of San Juan and its connected to the mainland by bridges and a causeway. Puerta de Tierra is the site of many of Puerto Rico's government buildings. With a 2000 census population of 4,135 and a land area of 0.60 sq. miles (1.55 km²), Puerta de Tierra is the largest and most populous sub-barrio of Old San Juan.