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← Area code 605

605-340 phone numbers

Numbers 605-340-0000 to 605-340-9999 are assigned to Onvoy, LLC in Spearfish, SD. 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 605-340-3xxx, 605-340-7xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 605-340