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The Denver area began mandatory 10-digit dialing of local calls in 1998, in preparation for the 303/720 area code overlay. All local calls within, between, into, or out from the 303 and 720 area codes must be dialed with 10 digits. Other local calls within area code 970 or within area code 719 may be dialable as either 7 or 10 digits.

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11y ago

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