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Updated Jan 02, 2010Area Code 203
  1. "E" is Eastern Time Zone, "C" is Central Time Zone, "M" is Mountain Time Zone, and "P" is Pacific Time Zone. Occasionally, an area code will fall in more than one time zone. In this case, the abbreviation is a combination of the previous abbreviations. Some area codes are shown with time zones referencing Universal Coordinated Time (UTC).
  2. Additional technical status can be retrived from the North American Numbering Plan Administration on the 203 area code specific link here.
Area Code203 (area code map)
LocationConnecticut
Dates and historical informationArea code 203 went live into service on January 01, 1947 (The paperwork process started on January 01, 1947).  It has had the 475, 860 area code(s) overlaid on it.
Growth StatusThis original "parent" area code went live on January 01, 1947 and due to growth it has been "overlaid" by the 475 area code to provide more telephone numbers in the area.  This means this original "parent" 203 area code has seen quite a bit of growth and as a result has been subdivided into 2 area codes over the years. Due to popularity, this area code is starting to run out of free telephone numbers for people to use which means that this area code is technically referred to as being "in jeoparady."   Planning is underway and notices have been distributed regarding the area code subdivision. 
Technical Status 2Area code 203 is currently live and in service.
Time Zone(s) 1E
LATA numbers served920, 132, 65535
Number of rate centers served33
List of rate centersNEW HAVEN, DARIEN, GUILFORD, DANBURY, WATERBURY, BRANFORD, BRIDGEPORT, WILTON, MERIDEN, WESTPORT, STAMFORD, TRUMBULL, HUNTINGTON, NORWALK, ANSONIDRBY, RIDGEFIELD, MADISON, CHESHIRE, FAIRFIELD, WOODBURY, WALLINGFD, NEWTOWN, OLDGRNWICH, MILFORD, GREENWICH, NEW CANAAN, BYRAM, REDDING, WOLCOTT, SEYMOUR, NAUGATUCK, GEORGETOWN, DIR ASST
Number of major cities served76
Names of major cities served (ZIP code)North Haven (06473), No Haven (06473), Darien (06820), Noroton (06820), Noroton Heights (06820), Tokeneke (06820), White Plains (10601), Guilford (06437), Danbury (06810), Waterbury (06702), Wtby (06702), Branford (06405), Bridgeport (06604), Wilton (06897), Meriden (06450), Westport (06880), Saugatuck (06880), Stamford (06901), Bridgeport (06611), Trumbull (06611), Shelton (06484), Huntington (06484), Norwalk (06851), Derby (06418), Ridgefield (06877), Madison (06443), Norwalk (06854), South Norwalk (06854), Cheshire (06410), Fairfield (06824), Southbury (06488), Woodbury (06798), Wallingford (06492), Yalesville (06492), Bethlehem (06751), Newtown (06470), Bridgeport (06606), Old Greenwich (06870), Milford (06460), Greenwich (06830), Belle Haven (06830), Southport (06890), New Canaan (06840), Stamford (06905), Ridgeway (06905), Middletown (06457), Bridgeport (06614), Stratford (06614), New Haven (06515), N Haven (06515), Westville (06515), New Haven (06524), Bethany (06524), New Haven (06510), N Haven (06510), Redding Center (06875), Waterbury (06716), Wolcott (06716), Seymour (06483), New Haven (06512), East Haven (06512), N Haven (06512), (00000), Waterbury (06708), Wtby (06708), New Haven (06516), West Haven (06516), N Haven (06516), W Haven (06516), Allingtown (06516), North Branford (06471), N Branford (06471), Litchfield (06759), Naugatuck (06770), Union City (06770), Georgetown (06829), Waterbury (06712), Prospect (06712), Port Chester (10573), Rye Brook (10573), Portchester (10573), Stamford (06902), Hartford (06103), Central (06103), Middlebury (06762), Greenwich (06831), Glenville (06831), Brookfield (06804), Brookfld Ctr (06804), Brookfield Center (06804), Orange (06477), New London (06320), Ft Trumbull (06320), U S Coast Guard Acad (06320), United States Coast Guard Ac (06320), (06430)
Number of exchanges served746
List of exchanges served203-201-xxxx, 203-202-xxxx, 203-204-xxxx, 203-205-xxxx, 203-206-xxxx, 203-207-xxxx, 203-208-xxxx, 203-209-xxxx, 203-210-xxxx, 203-212-xxxx, 203-213-xxxx, 203-214-xxxx, 203-215-xxxx, 203-216-xxxx, 203-217-xxxx, 203-218-xxxx, 203-219-xxxx, 203-220-xxxx, 203-221-xxxx, 203-222-xxxx, 203-223-xxxx, 203-224-xxxx, 203-225-xxxx, 203-226-xxxx, 203-227-xxxx, 203-228-xxxx, 203-229-xxxx, 203-230-xxxx, 203-231-xxxx, 203-232-xxxx, 203-233-xxxx, 203-234-xxxx, 203-235-xxxx, 203-236-xxxx, 203-237-xxxx, 203-238-xxxx, 203-239-xxxx, 203-240-xxxx, 203-241-xxxx, 203-242-xxxx, 203-243-xxxx, 203-244-xxxx, 203-245-xxxx, 203-246-xxxx, 203-247-xxxx, 203-248-xxxx, 203-249-xxxx, 203-250-xxxx, 203-251-xxxx, 203-252-xxxx, 203-253-xxxx, 203-254-xxxx, 203-255-xxxx, 203-256-xxxx, 203-257-xxxx, 203-258-xxxx, 203-259-xxxx, 203-260-xxxx, 203-261-xxxx, 203-264-xxxx, 203-265-xxxx, 203-268-xxxx, 203-269-xxxx, 203-270-xxxx, 203-271-xxxx, 203-272-xxxx, 203-273-xxxx, 203-274-xxxx, 203-275-xxxx, 203-276-xxxx, 203-277-xxxx, 203-278-xxxx, 203-279-xxxx, 203-280-xxxx, 203-281-xxxx, 203-282-xxxx, 203-283-xxxx, 203-284-xxxx, 203-285-xxxx, 203-286-xxxx, 203-287-xxxx, 203-288-xxxx, 203-289-xxxx, 203-290-xxxx, 203-291-xxxx, 203-292-xxxx, 203-293-xxxx, 203-294-xxxx, 203-295-xxxx, 203-296-xxxx, 203-297-xxxx, 203-298-xxxx, 203-299-xxxx, 203-300-xxxx, 203-301-xxxx, 203-302-xxxx, 203-303-xxxx, 203-304-xxxx, 203-305-xxxx, 203-306-xxxx, 203-307-xxxx, 203-308-xxxx, 203-309-xxxx, 203-310-xxxx, 203-312-xxxx, 203-313-xxxx, 203-314-xxxx, 203-315-xxxx, 203-316-xxxx, 203-317-xxxx, 203-318-xxxx, 203-319-xxxx, 203-320-xxxx, 203-321-xxxx, 203-322-xxxx, 203-323-xxxx, 203-324-xxxx, 203-325-xxxx, 203-326-xxxx, 203-327-xxxx, 203-328-xxxx, 203-329-xxxx, 203-330-xxxx, 203-331-xxxx, 203-332-xxxx, 203-333-xxxx, 203-334-xxxx, 203-335-xxxx, 203-336-xxxx, 203-337-xxxx, 203-338-xxxx, 203-339-xxxx, 203-340-xxxx, 203-341-xxxx, 203-342-xxxx, 203-343-xxxx, 203-344-xxxx, 203-345-xxxx, 203-346-xxxx, 203-347-xxxx, 203-348-xxxx, 203-349-xxxx, 203-350-xxxx, 203-351-xxxx, 203-352-xxxx, 203-353-xxxx, 203-354-xxxx, 203-355-xxxx, 203-356-xxxx, 203-357-xxxx, 203-358-xxxx, 203-359-xxxx, 203-362-xxxx, 203-363-xxxx, 203-364-xxxx, 203-365-xxxx, 203-366-xxxx, 203-367-xxxx, 203-368-xxxx, 203-369-xxxx, 203-370-xxxx, 203-371-xxxx, 203-372-xxxx, 203-373-xxxx, 203-374-xxxx, 203-375-xxxx, 203-376-xxxx, 203-377-xxxx, 203-378-xxxx, 203-379-xxxx, 203-380-xxxx, 203-381-xxxx, 203-382-xxxx, 203-383-xxxx, 203-384-xxxx, 203-385-xxxx, 203-386-xxxx, 203-387-xxxx, 203-388-xxxx, 203-389-xxxx, 203-390-xxxx, 203-391-xxxx, 203-392-xxxx, 203-393-xxxx, 203-394-xxxx, 203-395-xxxx, 203-396-xxxx, 203-397-xxxx, 203-398-xxxx, 203-399-xxxx, 203-400-xxxx, 203-401-xxxx, 203-402-xxxx, 203-403-xxxx, 203-404-xxxx, 203-405-xxxx, 203-406-xxxx, 203-407-xxxx, 203-408-xxxx, 203-409-xxxx, 203-410-xxxx, 203-412-xxxx, 203-413-xxxx, 203-414-xxxx, 203-415-xxxx, 203-416-xxxx, 203-417-xxxx, 203-418-xxxx, 203-419-xxxx, 203-420-xxxx, 203-421-xxxx, 203-422-xxxx, 203-423-xxxx, 203-424-xxxx, 203-425-xxxx, 203-426-xxxx, 203-427-xxxx, 203-428-xxxx, 203-429-xxxx, 203-430-xxxx, 203-431-xxxx, 203-432-xxxx, 203-433-xxxx, 203-434-xxxx, 203-435-xxxx, 203-436-xxxx, 203-437-xxxx, 203-438-xxxx, 203-439-xxxx, 203-440-xxxx, 203-441-xxxx, 203-442-xxxx, 203-443-xxxx, 203-444-xxxx, 203-445-xxxx, 203-446-xxxx, 203-447-xxxx, 203-448-xxxx, 203-449-xxxx, 203-450-xxxx, 203-451-xxxx, 203-452-xxxx, 203-453-xxxx, 203-454-xxxx, 203-455-xxxx, 203-456-xxxx, 203-457-xxxx, 203-458-xxxx, 203-459-xxxx, 203-460-xxxx, 203-461-xxxx, 203-462-xxxx, 203-463-xxxx, 203-464-xxxx, 203-465-xxxx, 203-466-xxxx, 203-467-xxxx, 203-468-xxxx, 203-469-xxxx, 203-470-xxxx, 203-477-xxxx, 203-479-xxxx, 203-480-xxxx, 203-481-xxxx, 203-482-xxxx, 203-483-xxxx, 203-484-xxxx, 203-485-xxxx, 203-487-xxxx, 203-488-xxxx, 203-489-xxxx, 203-490-xxxx, 203-492-xxxx, 203-493-xxxx, 203-494-xxxx, 203-495-xxxx, 203-496-xxxx, 203-497-xxxx, 203-498-xxxx, 203-499-xxxx, 203-500-xxxx, 203-502-xxxx, 203-503-xxxx, 203-504-xxxx, 203-505-xxxx, 203-506-xxxx, 203-507-xxxx, 203-508-xxxx, 203-509-xxxx, 203-510-xxxx, 203-512-xxxx, 203-513-xxxx, 203-514-xxxx, 203-515-xxxx, 203-516-xxxx, 203-517-xxxx, 203-518-xxxx, 203-520-xxxx, 203-521-xxxx, 203-522-xxxx, 203-523-xxxx, 203-524-xxxx, 203-525-xxxx, 203-526-xxxx, 203-527-xxxx, 203-528-xxxx, 203-529-xxxx, 203-530-xxxx, 203-531-xxxx, 203-532-xxxx, 203-533-xxxx, 203-534-xxxx, 203-535-xxxx, 203-536-xxxx, 203-537-xxxx, 203-538-xxxx, 203-539-xxxx, 203-540-xxxx, 203-541-xxxx, 203-542-xxxx, 203-543-xxxx, 203-544-xxxx, 203-545-xxxx, 203-546-xxxx, 203-547-xxxx, 203-548-xxxx, 203-549-xxxx, 203-550-xxxx, 203-551-xxxx, 203-552-xxxx, 203-553-xxxx, 203-554-xxxx, 203-555-xxxx, 203-556-xxxx, 203-557-xxxx, 203-558-xxxx, 203-559-xxxx, 203-560-xxxx, 203-561-xxxx, 203-562-xxxx, 203-563-xxxx, 203-564-xxxx, 203-565-xxxx, 203-566-xxxx, 203-567-xxxx, 203-568-xxxx, 203-569-xxxx, 203-570-xxxx, 203-571-xxxx, 203-572-xxxx, 203-573-xxxx, 203-574-xxxx, 203-575-xxxx, 203-576-xxxx, 203-577-xxxx, 203-578-xxxx, 203-579-xxxx, 203-580-xxxx, 203-581-xxxx, 203-582-xxxx, 203-583-xxxx, 203-585-xxxx, 203-587-xxxx, 203-588-xxxx, 203-589-xxxx, 203-591-xxxx, 203-592-xxxx, 203-593-xxxx, 203-594-xxxx, 203-595-xxxx, 203-596-xxxx, 203-597-xxxx, 203-598-xxxx, 203-599-xxxx, 203-601-xxxx, 203-602-xxxx, 203-603-xxxx, 203-604-xxxx, 203-605-xxxx, 203-606-xxxx, 203-607-xxxx, 203-608-xxxx, 203-609-xxxx, 203-610-xxxx, 203-612-xxxx, 203-613-xxxx, 203-614-xxxx, 203-615-xxxx, 203-616-xxxx, 203-617-xxxx, 203-618-xxxx, 203-619-xxxx, 203-620-xxxx, 203-621-xxxx, 203-622-xxxx, 203-623-xxxx, 203-624-xxxx, 203-625-xxxx, 203-626-xxxx, 203-627-xxxx, 203-628-xxxx, 203-629-xxxx, 203-630-xxxx, 203-631-xxxx, 203-632-xxxx, 203-633-xxxx, 203-634-xxxx, 203-635-xxxx, 203-636-xxxx, 203-637-xxxx, 203-638-xxxx, 203-639-xxxx, 203-640-xxxx, 203-641-xxxx, 203-643-xxxx, 203-644-xxxx, 203-645-xxxx, 203-646-xxxx, 203-647-xxxx, 203-648-xxxx, 203-649-xxxx, 203-650-xxxx, 203-651-xxxx, 203-652-xxxx, 203-653-xxxx, 203-654-xxxx, 203-655-xxxx, 203-656-xxxx, 203-657-xxxx, 203-658-xxxx, 203-659-xxxx, 203-660-xxxx, 203-661-xxxx, 203-662-xxxx, 203-663-xxxx, 203-664-xxxx, 203-665-xxxx, 203-667-xxxx, 203-668-xxxx, 203-669-xxxx, 203-670-xxxx, 203-671-xxxx, 203-672-xxxx, 203-673-xxxx, 203-674-xxxx, 203-675-xxxx, 203-676-xxxx, 203-677-xxxx, 203-678-xxxx, 203-679-xxxx, 203-680-xxxx, 203-681-xxxx, 203-682-xxxx, 203-683-xxxx, 203-685-xxxx, 203-686-xxxx, 203-687-xxxx, 203-688-xxxx, 203-689-xxxx, 203-690-xxxx, 203-691-xxxx, 203-692-xxxx, 203-694-xxxx, 203-695-xxxx, 203-696-xxxx, 203-697-xxxx, 203-698-xxxx, 203-699-xxxx, 203-701-xxxx, 203-702-xxxx, 203-703-xxxx, 203-704-xxxx, 203-705-xxxx, 203-706-xxxx, 203-707-xxxx, 203-708-xxxx, 203-709-xxxx, 203-710-xxxx, 203-712-xxxx, 203-713-xxxx, 203-714-xxxx, 203-715-xxxx, 203-716-xxxx, 203-718-xxxx, 203-719-xxxx, 203-720-xxxx, 203-721-xxxx, 203-722-xxxx, 203-723-xxxx, 203-724-xxxx, 203-725-xxxx, 203-726-xxxx, 203-727-xxxx, 203-728-xxxx, 203-729-xxxx, 203-730-xxxx, 203-731-xxxx, 203-732-xxxx, 203-733-xxxx, 203-734-xxxx, 203-735-xxxx, 203-736-xxxx, 203-737-xxxx, 203-738-xxxx, 203-739-xxxx, 203-740-xxxx, 203-741-xxxx, 203-742-xxxx, 203-743-xxxx, 203-744-xxxx, 203-745-xxxx, 203-746-xxxx, 203-747-xxxx, 203-748-xxxx, 203-749-xxxx, 203-750-xxxx, 203-751-xxxx, 203-752-xxxx, 203-753-xxxx, 203-754-xxxx, 203-755-xxxx, 203-756-xxxx, 203-757-xxxx, 203-758-xxxx, 203-759-xxxx, 203-760-xxxx, 203-761-xxxx, 203-762-xxxx, 203-763-xxxx, 203-764-xxxx, 203-765-xxxx, 203-766-xxxx, 203-767-xxxx, 203-768-xxxx, 203-769-xxxx, 203-770-xxxx, 203-771-xxxx, 203-772-xxxx, 203-773-xxxx, 203-774-xxxx, 203-775-xxxx, 203-776-xxxx, 203-777-xxxx, 203-778-xxxx, 203-779-xxxx, 203-780-xxxx, 203-781-xxxx, 203-782-xxxx, 203-783-xxxx, 203-784-xxxx, 203-785-xxxx, 203-786-xxxx, 203-787-xxxx, 203-788-xxxx, 203-789-xxxx, 203-790-xxxx, 203-791-xxxx, 203-792-xxxx, 203-793-xxxx, 203-794-xxxx, 203-795-xxxx, 203-796-xxxx, 203-797-xxxx, 203-798-xxxx, 203-799-xxxx, 203-801-xxxx, 203-803-xxxx, 203-804-xxxx, 203-805-xxxx, 203-806-xxxx, 203-807-xxxx, 203-808-xxxx, 203-809-xxxx, 203-810-xxxx, 203-812-xxxx, 203-813-xxxx, 203-814-xxxx, 203-815-xxxx, 203-816-xxxx, 203-817-xxxx, 203-818-xxxx, 203-819-xxxx, 203-820-xxxx, 203-821-xxxx, 203-822-xxxx, 203-823-xxxx, 203-824-xxxx, 203-825-xxxx, 203-826-xxxx, 203-827-xxxx, 203-828-xxxx, 203-829-xxxx, 203-830-xxxx, 203-831-xxxx, 203-832-xxxx, 203-833-xxxx, 203-834-xxxx, 203-835-xxxx, 203-836-xxxx, 203-837-xxxx, 203-838-xxxx, 203-839-xxxx, 203-840-xxxx, 203-841-xxxx, 203-842-xxxx, 203-843-xxxx, 203-844-xxxx, 203-845-xxxx, 203-846-xxxx, 203-847-xxxx, 203-848-xxxx, 203-849-xxxx, 203-851-xxxx, 203-852-xxxx, 203-853-xxxx, 203-854-xxxx, 203-855-xxxx, 203-856-xxxx, 203-857-xxxx, 203-858-xxxx, 203-859-xxxx, 203-861-xxxx, 203-862-xxxx, 203-863-xxxx, 203-865-xxxx, 203-866-xxxx, 203-867-xxxx, 203-868-xxxx, 203-869-xxxx, 203-870-xxxx, 203-871-xxxx, 203-872-xxxx, 203-873-xxxx, 203-874-xxxx, 203-875-xxxx, 203-876-xxxx, 203-877-xxxx, 203-878-xxxx, 203-879-xxxx, 203-880-xxxx, 203-881-xxxx, 203-882-xxxx, 203-883-xxxx, 203-884-xxxx, 203-885-xxxx, 203-886-xxxx, 203-887-xxxx, 203-888-xxxx, 203-889-xxxx, 203-890-xxxx, 203-891-xxxx, 203-892-xxxx, 203-893-xxxx, 203-894-xxxx, 203-895-xxxx, 203-896-xxxx, 203-897-xxxx, 203-898-xxxx, 203-899-xxxx, 203-901-xxxx, 203-902-xxxx, 203-903-xxxx, 203-904-xxxx, 203-905-xxxx, 203-906-xxxx, 203-907-xxxx, 203-908-xxxx, 203-909-xxxx, 203-910-xxxx, 203-912-xxxx, 203-913-xxxx, 203-915-xxxx, 203-916-xxxx, 203-917-xxxx, 203-918-xxxx, 203-919-xxxx, 203-920-xxxx, 203-921-xxxx, 203-922-xxxx, 203-923-xxxx, 203-924-xxxx, 203-925-xxxx, 203-926-xxxx, 203-927-xxxx, 203-928-xxxx, 203-929-xxxx, 203-930-xxxx, 203-931-xxxx, 203-932-xxxx, 203-933-xxxx, 203-934-xxxx, 203-935-xxxx, 203-936-xxxx, 203-937-xxxx, 203-938-xxxx, 203-940-xxxx, 203-942-xxxx, 203-943-xxxx, 203-944-xxxx, 203-945-xxxx, 203-946-xxxx, 203-947-xxxx, 203-948-xxxx, 203-949-xxxx, 203-951-xxxx, 203-952-xxxx, 203-953-xxxx, 203-954-xxxx, 203-955-xxxx, 203-956-xxxx, 203-957-xxxx, 203-961-xxxx, 203-962-xxxx, 203-963-xxxx, 203-964-xxxx, 203-965-xxxx, 203-966-xxxx, 203-967-xxxx, 203-968-xxxx, 203-969-xxxx, 203-971-xxxx, 203-972-xxxx, 203-973-xxxx, 203-974-xxxx, 203-975-xxxx, 203-977-xxxx, 203-978-xxxx, 203-979-xxxx, 203-980-xxxx, 203-981-xxxx, 203-982-xxxx, 203-983-xxxx, 203-984-xxxx, 203-985-xxxx, 203-986-xxxx, 203-987-xxxx, 203-988-xxxx, 203-989-xxxx, 203-990-xxxx, 203-991-xxxx, 203-992-xxxx, 203-993-xxxx, 203-994-xxxx, 203-995-xxxx, 203-996-xxxx, 203-998-xxxx
Number of telephone companies34 telephone companies servicing the 203 area code
List of telephone companiesUSA MOBILITY WIRELESS, INC., CABLEVISION LIGHTPATH, INC. - CT, LEVEL 3 COMMUNICATIONS, LLC - CT, SPRINT SPECTRUM L.P., BROOKS FIBER COMMUNICATIONS OF CONNECTICUT INC-CT, SOUTHERN NEW ENGLAND TELEPHONE CO., NEW CINGULAR WIRELESS PCS, LLC - DC, COMCAST PHONE OF CONNECTICUT, INC. - CT, CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT, BROADWING COMMUNICATIONS, LLC - CT, NEXTEL COMMUNICATIONS, INC., OMNIPOINT COMMUNICATIONS, INC. - CT, CTC COMMUNICATIONS - CT, MCIMETRO ACCESS TRANSMISSION SERVICES LLC, TELEPORT COMMUNICATIONS GROUP - NEW YORK - CT, CONVERSENT COMMUNICATIONS OF CONNECTICUT, LLC - CT, GLOBAL NAPS, INC. - RI, TELEPORT COMMUNICATIONS GROUP - NY, PAETEC COMMUNICATIONS, INC. - CT, CHOICE ONE COMMUNICATIONS, INC. - CT, YMAX COMMS CORP. CT, GLOBAL CROSSING LOCAL SERVICES, INC.-CT, MCI WORLDCOM COMMUNICATIONS, INC. - CT, AMERICAN MESSAGING (AM), INC., AT&T LOCAL, PAETEC COMMUNICATIONS, INC. - NY, VERIZON NEW YORK, INC., COX CONNECTICUT TELECOM, LLC, GLOBAL NAPS, INC. - CT, MULTIPLE OCN LISTING, BROADBAND OFFICE COMMUNICATIONS, INC. - CT, AQUIS COMMUNICATIONS, INC., SBC INTERNET SERVICES, INC., BANDWIDTH.COM CLEC, LLC - CT

203 Area Code Map

 
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