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Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
Area Codes Search Notes. Fixed phone numbers in the United States, state Colorado are comprised of a single country code (+1), a 3 digit area code, a 3 digit local office code (or region code), and a 4 digit line code. Making a call with the wrong country, area, or region code can be costly.
Boulder, CO is a city located in Boulder County, Colorado and has a land area of 159.82 square miles (413.93 km2). The water area for the city is 4.12 square miles or 10.67 km2. There are 11 total unique zip codes in Boulder, Colorado.
Delaware currently utilizes 1 area code. 302 has covered the entire state since the modern phone system was established by AT&T and the Bell System in 1947. Search by Phone:
Browse a complete list of area codes and look up area codes by city, state, or map. Reverse lookup areas codes by phone number and auto-detect your own area code by location.
