NANPA : Number Resources - NPA (Area) Codes
Area Code 313: Detroit, Michigan Local Phone Numbers | JustCall Blog
734) Area Code Phone Numbers For Business | $20/Month
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Michigan (MI) Phone Numbers - Local Area Code 231, 248, 269, 313, 517, 586, 616, 734, 810, 906, 947 and 989
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Area codes 419 and 567 - Wikipedia
Area codes 616, 810, 906 and 989 have new phone-dialing rules starting Oct. 24 - mlive.com
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Michigan Phone Numbers - Local Area Codes 231, 248, 269, 313, 517, 586, 616, 734, 810, 906, 947, 989
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Area Code 906, the Upper Peninsula of Michigan
Detroit, MI Local Phone Numbers | Area Code 313
Michigan wants to add 679 area code, says Detroit area running out of 313 phone numbers - CBS Detroit
Detroit could get new area code besides 313. Meet 679.
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