─────── § 04. NPA RECORD · 203 · FOLIO 0005 OF 0801 ──────────────
203
United States NPA Record
Original area code for the entire state of Connecticut assigned in 1947.
Original area code for the entire state of Connecticut assigned in 1947. It now covers southwestern Connecticut including Fairfield and New Haven counties after splits and overlays.
IN SERVICEFirst record · 1947
§ 04.05Event Summary
relief planned · 2split · 2introduced · 1jeopardy · 1mandatory dialing · 1other · 1
§ 04.06
Documentary Record · 11 events
CHRONOLOGICAL ORDER
1947-01-01
introduced
Area code 203 established as one of the original North American Numbering Plan area codes
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1995-01-01
split
Area code 860 split from 203
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1995-04-06
other
NANP-SPLIT OF 203 (CONNECTICUT) NUMBERING PLAN AREA (NPA)
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1995-08-28
split
NPA 860 split from 203
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1998-10-05
jeopardy
Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for Connecticut NPAs 203 & 860
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1999-08-01
relief planned
Overlay 475 proposed for NPA 203
The Connecticut Department of Public Utility Control proposed an overlay plan for area code 203.
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1999-09-22
relief planned
Overlay of 475 on 203 ordered
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2000-02-24
NPA 475 overlay on 203 announced
NPA 475 To Overlay NPA 203; NPA 959 To Overlay NPA 860 (Connecticut)
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2009-04-14
NPA 475 overlay on 203 announced
NPA 475 to Overlay NPA 203; NPA 860 10-digit dialing (Connecticut)
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2009-11-14
mandatory dialing
Mandatory ten-digit dialing implemented for all Connecticut area codes
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2009-12-12
NPA 475 overlaid on 203
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