─────── § 04. NPA RECORD · 623 · FOLIO 0425 OF 0801 ──────────────
623
United States NPA Record
Created in 1999 as part of a three-way split of 602, area code 623 serves the West Valley of the Phoenix metropolitan area.
Created in 1999 as part of a three-way split of 602, area code 623 serves the West Valley of the Phoenix metropolitan area.
IN SERVICEFirst record · 1999
§ 04.05Event Summary
other · 3permissive dialing · 3boundary change · 1relief planned · 1split · 1
§ 04.06
Documentary Record · 11 events
CHRONOLOGICAL ORDER
1999-02-01
other
NANP-Split of the 602 (Arizona) Numbering Plan Area (NPA) and the Addition of the 480 and 623 NPA's
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1999-03-01
split
NPA 623 split from 602
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1999-04-01
Introduction of overlay area code 623 in Phoenix West Valley
On April 1, 1999, area code 623 was added as an overlay for the West Valley region of Phoenix, Arizona, alongside 480 and 602, requiring ten-digit dialing.
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1999-04-01
permissive dialing
Permissive dialing begins for new area codes 480 and 623
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1999-07-21
other
Urgent reminder to update networks for the 602 NPA Split in Phoenix, Arizona with the new 623 and 480 NPAs
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2021-02-11
permissive dialing
Permissive ten-digit dialing begins in 602 and 623
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2021-11-09
relief planned
Boundary elimination overlay for 602, 480, and 623 approved and planned
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2021-12-30
other
NPA 480, 602 and 623 Boundary Elimination Overlay (Arizona)
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2023-02-11
permissive dialing
Permissive ten-digit dialing for 602 and 623
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2023-09-12
Overlay complex activated for 602, 480, and 623 in 2023
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2023-09-12
boundary change
Arizona overlay complex implementation and mandatory 10-digit dialing
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