 In terms of the United States 2000 Census, La Perla is composed of Census blocks 3001 through 3010 (Block group 3, Census tract 4, San Juan, Puerto Rico).A population of 338 was reported, 198 housing units (29 unoccupied), and 169 households, on an area of 80,028 square yards (16.53 acres; 66,914 m²).La Perla belongs to and consists of the northernmost stretches of the subbarrios "Mercado" (west) and "San Cristóbal" (east) of Old San Juan.