What time zone is area code 203 in?

Area code 203 uses Eastern Time.

What area codes overlay 203?

475 serves the same area as 203. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.

Is a call from area code 203 a scam?

The area code alone doesn’t tell you. Most calls from 203 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 203 number, let it go to voicemail.

Can a 203 number be outside Connecticut?

Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 203 caller can be anywhere.

Area code 203

Where is area code 203?

New Haven, Stamford and Bridgeport, Connecticut

Local time: … (Eastern Time)

State	Connecticut
Country	United States
Main cities	New Haven, Stamford and Bridgeport
Time zone	Eastern Time
Overlay area codes	475
In service since	1947
Assigned prefixes	784
Dialing format	(203) XXX-XXXX · +1 203 XXX XXXX from abroad

Look up a 203 number

Cities and towns in area code 203

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 203.

New Haven, CT (124)
Stamford, CT (97)
Bridgeport, CT (87)
Norwalk, CT (60)
Danbury, CT (50)
Waterbury, CT (50)
Greenwich, CT (35)
Meriden, CT (24)
Ansonia, CT (16)
Westport, CT (16)
Darien, CT (15)
Fairfield, CT (15)
Milford, CT (14)
Shelton, CT (14)
Wallingford, CT (14)
Monroe, CT (13)
Branford, CT (10)
Cheshire, CT (10)
New Canaan, CT (9)
Oldgrnwich, CT (9)
Guilford, CT (8)
Wilton, CT (8)
Stratford, CT (7)
Hamden, CT (6)
Madison, CT (6)
Naugatuck, CT (6)
Southbury, CT (6)
Xxxxxxxxxx, CT (6)
Newtown, CT (5)
Ridgefield, CT (5)
Seymour, CT (5)
West Haven, CT (5)
East Haven, CT (4)
Wolcott, CT (4)
Georgetown, CT (3)
Orange, CT (3)
Redding, CT (3)
Brookfield, CT (2)
New Fairfield, CT (2)
North Haven, CT (2)
Bethany, CT (1)
Bethlehem, CT (1)
Derby, CT (1)
Middlebury, CT (1)
Prospect, CT (1)
Woodbury, CT (1)

Phone companies in area code 203

The carriers that hold the most 203 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

Prefixes	Carrier
338	Frontier Comm of Ct
61	Verizon Wireless
52	New Cingular Wireless PCS (AT&T)
47	Omnipoint Communications (T-Mobile)
41	Mcimetro Access Transmission Services
41	Level 3 Communications
40	Paetec Itel
33	Teleport Communications America

All 784 prefixes in area code 203

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Area codes that overlay 203

Questions

Where is area code 203?: Area code 203 is in Connecticut. It serves New Haven, Stamford, Bridgeport, Norwalk and Danbury and 41 other cities and towns.
What time zone is area code 203 in?: Area code 203 uses Eastern Time.
What area codes overlay 203?: 475 serves the same area as 203. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.
Is a call from area code 203 a scam?: The area code alone doesn’t tell you. Most calls from 203 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 203 number, let it go to voicemail.
When did area code 203 start?: 203 went into service in 1947.
Can a 203 number be outside Connecticut?: Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 203 caller can be anywhere.

Other area codes in Connecticut

Area code	Main cities
860	Hartford, New London and Norwich
959	Hartford, New Britain and New London