UCSD's area code changed FROM 619 TO 858 on June 12, 1999.

San Diego's 619 area code was split into three area codes. On June 12, 1999, the northern part including us (as well as La Jolla, Poway, Rancho Bernardo, Rancho Santa Fe) became the 858 area code. On June 10, 2000, the southern and eastern part (Coronado, National City, San Ysidro, Chula Vista, El Cajon, Dulzura, Jacumba) will become area code 935.