A U.S. area code is a three-digit numeric prefix for telephone numbers in a given geographic area. There are about 300 of them, including overlays. (In an overlay, two or more numeric area codes serve overlapping geographic zones.)
Area codes in the US and Canada were introduced in 1947.
There is a list of area codes for the US and Canada on LincMad.com; see the related link.
The US and Canada began using area codes in 1947.
The US and Canada began using area codes in 1947.
There are about 300 area codes in the United States, about 30 in Canada, and about 20 in other miscellaneous islands in or near the Caribbean that share country code +1 with the US and Canada. There are about 400 area codes in Mexico. There are about 600 area codes in the UK. There are about 5,200 area codes in Germany.
(See related links)
512 is one of the area codes for the area surrounding Austin, Texas. Area codes in the US are not specific to cell phones or land lines.
See the related link.
Short answer: you can't. About the best you can do is to know the North American area codes that are outside the US, or especially those that are outside the US and Canada. See the related link for more information.
Area code +44 121 is Birmingham, England, United Kingdom There is no North American (US, Canada, etc.) area code +1 121; North American area codes never begin with 1. There are several +1 21X area codes, all in the US.
In 1947, when area codes were introduced to the US and Canada, the entire Detroit metro area was area code 313. Other area codes were added starting in the 1990's.
An area code is a numeric prefix identified with telephone numbers in a particular portion of a country. Area codes were first introduced in the US and Canada in 1947, and in the UK in 1958.