 The former First Church of Christ, Scientist, once one of Jim Jones' Peoples Temples, was located in Pico-Union, at the corner of Alvarado Street and Alvarado Terrace.Pico-Union is the fourth-most-dense neighborhood in Los Angeles, surpassed only by East Hollywood, Westlake and Koreatown.The 2000 U.S. census counted 42,324 residents in the 1.67-square-miles neighborhood—an average of 25,352 people per square mile.