Connecticut area codes

Codes in service in Connecticut

Connecticut has 4 geographic area codes in service: 203, 475, 860, 959. 203 is the oldest, dated 1947, and 959 the newest, dated 30 Aug 2014.1 All of Connecticut's codes are on Eastern time.

Area code	NANPA location	NPA in-service date	In-service overlay peers	Time zone	Local calls within the code
203	CT	1947	475	Eastern	10 digits
475	CT	12 Dec 2009	203	Eastern	10 digits
860	CT	28 Aug 1995	959	Eastern	10 digits
959	CT	30 Aug 2014	860	Eastern	10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Connecticut

Before 1960: 203 (1947)
1990s: 860 (28 Aug 1995)
2000s: 475 (12 Dec 2009)
2010s: 959 (30 Aug 2014)

Connecticut's in-service overlay groups are 203/475; 860/959.1

203/475: 203 (1947) was joined by 475 on 12 Dec 2009.
860/959: 860 (1995) was joined by 959 on 30 Aug 2014.

Dialing in Connecticut

Local calls within a single area code in Connecticut (203, 475, 860, 959) are all recorded as 10 digits. From any of Connecticut's codes, local calls to another area code are all recorded as 10 digits.1

Neighbours of Connecticut

Regions that border Connecticut:

Massachusetts: 9 codes (339, 351, 413, 508, ...)
New York: 23 codes (212, 315, 329, 332, ...)
Rhode Island: 1 code (401)

Rules that apply to every region are on the area-code reference.

Get a number in Connecticut

Sign up and search for a local number by area code; the app shows only numbers in stock, and big-city codes often sell out, so no specific code is guaranteed.

Get started

Articles on this topic

Topics Business phone number Virtual phone number All topics

Article · 26 min read

How to Get a Business Phone Number: Options & Costs

Learn how to get a business phone number in 2026, compare eight option types and real team pricing, and check porting, identity, toll-free and emergency-calling requirements.

Article · 25 min read

Why Your Business Number Shows as Spam Likely

A 2026 US diagnostic guide to Spam Likely labels, covering CNAM, STIR/SHAKEN, carrier testing, spoofing, and free redress routes.

Article · 23 min read

How to Check Phone Number History for a New Business

Learn how to check phone number history in 2026 before publishing a new business number: verify public listings, test calls, compare provider remedies and decide whether to accept or replace it.

Article · 23 min read

Business Call Forwarding to Cell Phone: Caller ID and Voicemail

A 2026 test guide for business calls forwarded to staff mobiles: identify the incoming number, prevent personal voicemail pickup, verify callbacks, and compare routing options.

Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
https://reports.nanpa.com/public/npa_report.csv