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Area code 323 covers much of the City of Los Angeles and several inner suburbs, originally split off from 213 in 1998. It will be overlaid by area code 738 in 2024. See the full list of California area codes and their service areas.
Find the area codes for different regions or countries in North America, including the original NANP and other autonomous plans. Learn how to format and dial telephone numbers in Mexico, Greenland, and Saint Pierre and Miquelon.
Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan (NANP). It covers the entire state and has been in service since 1947. See the list of central office prefixes and their locations in the table.
Find the area code for any location in North America, including the United States, Canada, and some Caribbean countries. The web page shows the numerical order, territory, date, and notes for each area code, including the overlay and split history.
Find out the five area codes of Colorado, including the original 303 code for Denver and its overlay codes 720 and 983. Learn about the new area code 748 for northern and western Colorado, coming in 2026.
Learn about the history and development of the North American Numbering Plan (NANP), which was established by AT&T in 1947 to enable direct distance dialing across the continent. The article covers the initial numbering plan areas and area codes, the expansion and changes over time, and the technical specifications and requirements.
Area codes 805 and 820 are telephone area codes in California, covering most of San Luis Obispo, Santa Barbara, Ventura, and southern Monterey counties. They were created in 1957 and 2018, respectively, and require ten-digit dialing for all calls.
Find out the five area codes that cover the state of Iowa and their locations on a map. Learn about the history and status of each area code and how to use them for phone numbers.
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