─────── § 04. NPA RECORD · 539 · FOLIO 0341 OF 0801 ──────────────
539
United States NPA Record
Overlay area code for the 918 numbering plan area in northeast Oklahoma, introduced in 2011 to provide additional numbering resources.
Overlay area code for the 918 numbering plan area in northeast Oklahoma, introduced in 2011 to provide additional numbering resources.
IN SERVICEFirst record · 2009
§ 04.05Event Summary
mandatory dialing · 1permissive dialing · 1relief planned · 1
§ 04.06
Documentary Record · 5 events
CHRONOLOGICAL ORDER
2009-12-30
relief planned
Overlay of 539 announced for 918
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2010-03-01
NPA 539 overlay on 918 announced
NPA 539 to Overlay NPA 918 (Oklahoma)
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2010-08-07
permissive dialing
Permissive 10-digit dialing begins for 918/539
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2011-03-05
mandatory dialing
Mandatory ten-digit dialing in 918/539
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2011-04-01
Overlay of area code 539 over 918
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