─────── § 04. NPA RECORD · 773 · FOLIO 0575 OF 0801 ──────────────
773
United States NPA Record
Area code serving the city of Chicago outside the downtown area, created in 1996 as a split from 312.
Area code serving the city of Chicago outside the downtown area, created in 1996 as a split from 312.
IN SERVICEFirst record · 1996
§ 04.05Event Summary
split · 3mandatory dialing · 2permissive dialing · 1relief planned · 1
§ 04.06
Documentary Record · 8 events
CHRONOLOGICAL ORDER
1996-10-01
split
NPA 773 split from 312
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1996-10-11
split
NPA 773 split from 312 for outer Chicago
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1996-10-12
split
NPA 773 split from 312 for Chicago's outer areas
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1996-10-12
permissive dialing
Permissive dialing period begins for 773 and 312
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1997-01-11
mandatory dialing
Mandatory dialing of 773 and 312 begins
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2007-08-10
relief planned
Overlay planned for 312 and 773 with 872
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2009-11-07
NPA 872 overlay activated for 312 and 773
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2009-11-07
mandatory dialing
Mandatory 11-digit dialing for 312, 773, and 872
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