─────── § 04. NPA RECORD · 457 · FOLIO 0259 OF 0801 ──────────────
457
United States NPA Record
Overlay area code introduced in Louisiana to supplement 504, providing additional numbering capacity in the same geographic area.
Overlay area code introduced in Louisiana to supplement 504, providing additional numbering capacity in the same geographic area.
IN SERVICEFirst record · 2023
§ 04.05Event Summary
mandatory dialing · 1permissive dialing · 1relief planned · 1service expansion · 1
§ 04.06
Documentary Record · 6 events
CHRONOLOGICAL ORDER
2023-05-01
relief planned
Overlay relief for 318 approved
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2023-06-23
NPA 457 overlay on 318 announced
NPA 457 to Overlay NPA 318 (Louisiana)
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2024-08-26
service expansion
Network preparation and customer education for 318/457 overlay begins
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2025-02-24
permissive dialing
Permissive ten-digit dialing begins for 318/457 overlay
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2025-08-25
mandatory dialing
Mandatory ten-digit dialing for 318/457 overlay
Mandatory ten-digit dialing began on August 25, 2025, for all calls in the 318 and 457 overlay region, ending the permissive dialing period.
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2025-09-25
Overlay of 318 with 457 begins
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