Area code 660 is the telephone numbering plan code for Northern and Western Missouri in the North American Numbering Plan. It was created in 1997 as a split from area code 816.
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| Missouri area codes: 314, 417, 573, 636, 660, 816 |
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North: 319, 641, 712 |
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| West: 402, 785, 913 |
area code 660 surrounds 816 |
East: 573 |
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South: 417 |
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| Iowa area codes: 319, 515, 563, 641, 712 |
| Kansas area codes: 316, 620, 785, 913 |
| Nebraska area codes: 308, 402 |