"E" is Eastern Time Zone, "C" is Central Time Zone, "M" is Mountain Time Zone, and "P" is Pacific Time Zone. Occasionally, an area code will fall in more than one time zone. In this case, the abbreviation is a combination of the previous abbreviations. Some area codes are shown with time zones referencing Universal Coordinated Time (UTC).
Additional technical status can be retrived from the North American Numbering Plan Administration on the 619 area code specific link here.
Area code 619 went live into service on January 01, 1982.  It was formed as a subdivision of the 714 area code.  It has had the 760 area code(s) overlaid on it.
Due to popularity, this area code is starting to run out of free telephone numbers for people to use which means that this area code is technically referred to as being "in jeoparady." Although planning efforts have been put on hold, a notice has been distributed regarding the area code subdivision. 2
SNDG SNDG, EL CAJON, JACUMBA, CHULAVISTA, CORONADO, NATIONALCY, LA MESA, DULZURA, SNDG LVTA, HARBSNALPN, PINEVALLEY, CAMPO, SNDG0290T, LA JOLLA, POWAY
Number of major cities served
Names of major cities served (ZIP code)
San Diego (92101), El Cajon (92020), San Diego (92108), Carlsbad (92010), San Diego (92103), Anaheim (92805), Federal (92805), San Diego (92118), Coronado (92118), San Diego (92107), Ocean Beach (92107), San Diego (92105), San Diego (92115), Lincoln Acres (91950), National City (91950), La Mesa (91941), Santee (92071), San Diego (92139), San Diego (92102), San Diego (92109), Pacific Beach (92109), Alpine (91901), Cathedral City (92235), Lemon Grove (91945), El Cajon (92021), Bostonia (92021), Crest (92021), Boulevard (91905), Chula Vista (91909), Chula Vista (91910), Tecate (91980), Lakeside (92040), San Diego (92122), San Diego (92104), Spring Valley (91977), San Diego (92154), Imperial Beach (91932), Imperial Bch (91932), Jamul (91935), Pine Valley (91962), Campo (91906), El Cajon (92019), Chula Vista (91913), San Diego (92126), (92041), Spring Valley (91978), San Diego (92173), San Ysidro (92173), La Jolla (92037), Poway (92064), Escondido (92033), Descanso (91916), La Mesa (91942)
48 telephone companies servicing the 619 area code
List of telephone companies
NEW CINGULAR WIRELESS PCS, LLC, SPRINT SPECTRUM L.P., CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA, COX CALIFORNIA TELCOM, INC. - CA, LEVEL 3 COMMUNICATIONS, LLC - CA, XO CALIFORNIA, INC., TELEPORT COMMUNICATIONS GROUP - SAN DIEGO, NEXTEL COMMUNICATIONS, INC., PACIFIC BELL, PAETEC COMMUNICATIONS, INC. - CA, PG TELECOM OF CALIFORNIA INC. - CA, T-MOBILE USA, INC., AT&T LOCAL, MCIMETRO ACCESS TRANSMISSION SERVICES LLC, USA MOBILITY WIRELESS, INC., MCI WORLDCOM COMMUNICATIONS, INC., CA, TW TELECOM OF CALIFORNIA LP - CA, SAN DIEGO PAGING, 360NETWORKS (USA) INC. - CA, INFOTELECOM, LLC - CA, POINTE COMMUNICATIONS CORP. - CA, LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC., AMERICAN MESSAGING (AM), INC., MPOWER COMMUNICATIONS CORP - CA, O1 COMMUNICATIONS, INC. - CA, NETWORK SERVICES LLC (TSR), GLOBAL CROSSING LOCAL SERVICES, INC.-CA, TELCENTRIS COMMUNICATIONS, LLC - CA, PAC - WEST TELECOMM, INC., U.S. TELEPACIFIC CORP. - CA, COOK TELECOM, INC., DIGITCOM SERVICES, INC., NORTH COUNTY COMMUNICATIONS CORP. - CA, NETWORK SERVICES LLC, DMR COMMUNICATIONS INC. - CA, SBC INTERNET SERVICES, INC., CURATEL, LLC - CA, YMAX COMMUNICATIONS CORP. - CA, SPRINT COMMUNICATIONS COMPANY, L.P. - CA, NEUTRAL TANDEM-CALIFORNIA, LLC - CA, COMMPARTNERS, LLC - CA, MPOWER NETWORKS SERVICES INC. - CA, CF COMMUNICATIONS, LLC DBA TELEKENEX - CA, ALLEGIANCE TELECOM, INC. - CA, CBEYOND COMMUNICATIONS, LLC - CA, UTILITY TELEPHONE, INC. - CA, PACIFIC CENTREX SERVICES, INC. - CA, NEXTWAVE TELECOM, INC DBA NEXTWAVE WIRELESS