{
    "title": "How Los Angeles's Original Area Code Split Into Today's Core Codes",
    "scope": "This is the 213 lineage for the core Los Angeles County codes \u2014 the 213 \u2192 818 / 310 / 323 branches and their overlays. It is not a list of every area code in Greater Los Angeles (which by some definitions also includes 661, 562, 714/949, 909/951, 805 and others), nor a complete tree of every code ever derived from 213.",
    "version": "2026.2",
    "updated": "2026-09-18",
    "changelog": "v2026.2 \u2014 corrected 424 dates (mandatory dialing vs in-service), rebuilt genealogy with split/overlay edge types and the 213/323 overlay complex, promoted split/overlay types and years to primary CPUC sources.",
    "license": "This structured dataset, as compiled and arranged by North American Numbers, is licensed CC BY 4.0 \u2014 attribute NorthAmericanNumbers.org. The underlying facts are drawn from the cited CPUC and other sources, which remain under their own terms.",
    "creator": "North American Numbers",
    "source_url": "https://northamericannumbers.org/metro/los-angeles",
    "root_npa": "213",
    "timeline": [
        {
            "date": "1947",
            "npa": "213",
            "type": "original",
            "event": "213 was one of the original North American area codes, serving a broad Southern California territory.",
            "source": "CPUC 213 Report (primary)"
        },
        {
            "date": "1984",
            "npa": "818",
            "type": "split",
            "parent": "213",
            "event": "The 213 area was geographically split and 818 was implemented, taking the San Fernando and San Gabriel Valleys.",
            "source": "CPUC 818 Report (primary)"
        },
        {
            "date": "1991",
            "npa": "310",
            "type": "split",
            "parent": "213",
            "event": "310 was created by a geographic split from 213, covering the Westside, South Bay and coastal L.A. County.",
            "source": "CPUC 310 Report (primary)"
        },
        {
            "date": "1997 (Jan)",
            "npa": "562",
            "type": "split",
            "parent": "310",
            "event": "562 was split from 310, serving Long Beach and the southeast L.A. County corridor.",
            "source": "CPUC 310 final decision (primary)"
        },
        {
            "date": "1997 (Jun)",
            "npa": "626",
            "type": "split",
            "parent": "818",
            "event": "The 818 area was geographically split and 626 was implemented, taking the eastern San Gabriel Valley.",
            "source": "CPUC 818 Report (primary)"
        },
        {
            "date": "1998 (Jun)",
            "npa": "323",
            "type": "split",
            "parent": "213",
            "event": "323 was split from 213; 213 kept downtown exchanges while 323 took surrounding areas such as Hollywood. (An earlier \"1997\" figure refers to the 1997 CPUC decision, not the in-service split.)",
            "source": "CPUC news release, June 13 2017 (primary)"
        },
        {
            "date": "2006-07-26 \u2192 08-26",
            "npa": "424",
            "type": "overlay",
            "parent": "310",
            "event": "424 was added as an all-services overlay of 310 \u2014 California's first overlay. Mandatory 1+10-digit dialing began July 26, 2006; new 424 numbers became assignable August 26, 2006 (CPUC Decision D.05-08-040).",
            "source": "CPUC news release 58447 (primary)"
        },
        {
            "date": "2009",
            "npa": "747",
            "type": "overlay",
            "parent": "818",
            "event": "747 was added as an all-services overlay of the 818 area, approved by CPUC decision on April 24, 2008 and in service in 2009.",
            "source": "CPUC news release 81877 / D.08-04-059 (primary)"
        },
        {
            "date": "2017-07-08",
            "npa": "213 + 323",
            "type": "complex",
            "parent": "213",
            "event": "The boundary between 213 and 323 was eliminated, converting them into a mutual all-services overlay complex (each code can be assigned across the combined region). CPUC ordered this in July 2016; mandatory 10-digit dialing took effect July 8, 2017.",
            "source": "CPUC news release, June 13 2017 (primary)"
        },
        {
            "date": "2024-11-01",
            "npa": "738",
            "type": "overlay",
            "parent": "213 + 323",
            "event": "738 went into service as an additional all-services overlay on the combined 213/323 region (CPUC decision March 16, 2023).",
            "source": "CPUC 213/323/738 page (primary)"
        }
    ],
    "genealogy": [
        {
            "from": "213",
            "to": "818",
            "type": "split",
            "year": 1984
        },
        {
            "from": "213",
            "to": "310",
            "type": "split",
            "year": 1991
        },
        {
            "from": "213",
            "to": "323",
            "type": "split",
            "year": 1998
        },
        {
            "from": "818",
            "to": "626",
            "type": "split",
            "year": 1997
        },
        {
            "from": "818",
            "to": "747",
            "type": "overlay",
            "year": 2009
        },
        {
            "from": "310",
            "to": "562",
            "type": "split",
            "year": 1997
        },
        {
            "from": "310",
            "to": "424",
            "type": "overlay",
            "year": 2006
        },
        {
            "from": "213 + 323",
            "to": "738",
            "type": "overlay",
            "year": 2024
        }
    ],
    "overlay_complexes": [
        {
            "members": [
                "213",
                "323"
            ],
            "year": 2017,
            "note": "In 2017 the boundary between 213 and 323 was removed: they became a mutual all-services overlay, so either code can be assigned anywhere in the combined region. 738 was later overlaid on top of this complex."
        }
    ],
    "sources": [
        {
            "publisher": "California Public Utilities Commission (CPUC)",
            "doc": "Area Code 213 Report \u2014 1947 origin and the codes later carved from it",
            "url": "https://docs.cpuc.ca.gov/publishedDocs/published/report/19546.htm"
        },
        {
            "publisher": "CPUC",
            "doc": "Report on the 818 Area Code \u2014 818 split (1984) and 626 split (June 1997), both geographic",
            "url": "https://docs.cpuc.ca.gov/published/report/24292.htm"
        },
        {
            "publisher": "CPUC",
            "doc": "Report on the 310 Area Code / 310 final decision \u2014 310 split (1991) and 562 split (Jan 1997)",
            "url": "https://docs.cpuc.ca.gov/publishedDocs/published/report/26755.htm"
        },
        {
            "publisher": "CPUC",
            "doc": "News release 58447 \u2014 424 overlay of 310: mandatory dialing July 26 2006, 424 in service Aug 26 2006 (D.05-08-040)",
            "url": "https://docs.cpuc.ca.gov/published/News_release/58447.htm"
        },
        {
            "publisher": "CPUC",
            "doc": "News release 81877 \u2014 747 overlay of 818 approved April 24 2008 (D.08-04-059)",
            "url": "https://docs.cpuc.ca.gov/PUBLISHED/NEWS_RELEASE/81877.htm"
        },
        {
            "publisher": "CPUC",
            "doc": "News release (June 13 2017) \u2014 323 split from 213 (June 1998); 213/323 boundary elimination overlay, mandatory dialing July 8 2017",
            "url": "https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M190/K687/190687064.PDF"
        },
        {
            "publisher": "CPUC",
            "doc": "213/323/738 Area Codes page \u2014 738 overlay, decision March 16 2023, in service Nov 1 2024",
            "url": "https://www.cpuc.ca.gov/213_323_areacodes"
        }
    ]
}