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The first three digits are the area code, which refers to a broad geographic region. The next three digits denote the prefix, which typically corresponds to a smaller area within the area code's region. With four remaining digits every local exchange has 10,000 possible unique numbers (from 0000 to 9999).

The area served by the 209 area code currently includes Amador, Calaveras, Mariposa, Merced, San Joaquin, Stanislaus, and Tuolumne Counties, and portions of Alameda, Alpine, El Dorado, Fresno, Madera and Sacramento Counties.

Area code 213 was one of three original area codes assigned to California. Where is area code 213? It covers nearly the entire city of Los Angeles outside of the San Fernando Valley, including Hollywood, plus several smaller cities and unincorporated areas of Los Angeles County immediately to the south and east.

NANPA assigns new area codes for the entire nation. Soon after receiving the PUC decision on how a new area code will be added, NANPA determines the new area code and informs the PUC, which announces it to the public.

The North American Numbering Plan Administrator (NANPA) determines the need for and the timing of area code relief. The administrator is Somos, Inc. The Public Service Commission (PSC) decides which method (overlay or geographical split) will be used to implement the new area code.

States with more than one area code generally had a 1 as a second digit (hence why New York City's most common area code is 212), and states with a single area code generally had a 0 in the second digit (hence why Florida has the 305 area code).

The 201 area code is located in the eastern part of New Jersey. The two main counties that are served by this area code are Bergen and Hudson. There are numerous cities with a 201 area code. The biggest amongst them include Jersey City, Union City, Bayonne, Hoboken and West New York.