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Phone Directory 307-340 Detail

State Major City Time Zone
Wyoming Casper Mountain

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Example: (307) 340-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
307-340 Manville, WY Cellco Partnership DBA Verizon Wireless Niobrara Cell Number 09/11/1994

Other Series For Prefixes

307-3400###
307-3401###
307-3402###
307-3403###
307-3404###
307-3405###
307-3406###
307-3407###
307-3408###
307-3409###