─────── § 04. NPA RECORD · 531 · FOLIO 0333 OF 0801 ──────────────
531
United States NPA Record
Area code 531 was added in 2011 as an overlay to the 402 area code in eastern Nebraska to provide relief for number exhaustion.
Area code 531 was added in 2011 as an overlay to the 402 area code in eastern Nebraska to provide relief for number exhaustion.
First record · 2009
§ 04.05Event Summary
mandatory dialing · 2activated · 1relief canceled · 1service expansion · 1
§ 04.06
Documentary Record · 10 events
CHRONOLOGICAL ORDER
2009-08-17
NPA 531 overlay on 402 announced
NPA 531 to Overlay NPA 402 (Nebraska)
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2009-10-07
NPA 531 overlay on 402 announced
NPA 531 to Overlay NPA 402 (Nebraska)
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2010-09-01
NPA 531 overlay on 402 announced
NPA 531 to Overlay NPA 402 (Nebraska)
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2011-01-01
NPA 531 overlays 402
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2011-02-26
mandatory dialing
Mandatory 10-digit dialing in 402 and 531
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2011-03-01
NPA 531 overlays 402
Area code 531 was added as an overlay to area code 402 in March 2011, covering the same eastern Nebraska region to address number exhaustion.
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2011-03-01
mandatory dialing
Mandatory ten-digit dialing implemented in 402/531 area
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2013-02-01
activated
First central office prefix assigned in 531
In February 2013, the first central office prefix in area code 531 was assigned, marking the beginning of active use for the overlay code.
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2013-02-01
service expansion
First central office prefix assigned in 531
The first central office prefix in area code 531 was assigned in February 2013, marking the beginning of active number assignments in the overlay code.
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2021-05-25
relief canceled
NPA 368 to Overlay NPAs 403/587/780/825 (Alberta, Canada) Deferred – supersedes PL-531
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