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In the North American Numbering Plan, telephone area code 337 covers southwestern Louisiana. It was created on October 11, 1999. Before the 337 code was formed, this area was the southern half of area code 318, which had covered most of Louisiana west of the Mississippi River since 1957.
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code louisiana area 337 october telephone created 2021 988 dialing north american numbering plan covers southwestern 11 1999 formed southern
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