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Maryland 410 / 443 / 667 Area Code Overlay FAQs

General Information

  1. What is an area code overlay?

    An overlay is the addition of another area code to the same geographic region as an existing area code. In this instance, the new 667 area code is being added to the region served by the 410 and 443 area codes.

    The 667 overlay does not require any customers to change their existing area code or telephone numbers, but it does require anyone receiving a 667 telephone number to dial the area code and the 7-digit number for all calls, including calls within the same area code.

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  2. Who is affected by the Maryland 410 / 443 / 667 area code overlay?

    All customers with 410 or 443 telephone numbers should be aware that the new 667 area code will serve customers in the same geographic region as the current 410 and 443 area codes when implemented.

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  3. What will change when the Maryland 410 / 443 / 667 area code overlay goes into effect?

    For 410 and 443 customers, there will be no change to your existing area code, phone number or dialing pattern. The 410 and 443 area codes already have mandatory 10-digit dialing in place and no changes will be made to those dialing patterns with the implementation of the new 667 area code. The 410 and 443 customers simply need to be aware that the new 667 area code will serve the same geographic region as the existing 410 and 443 area codes.

    If you are a customer who receives a 667 telephone number, you should be aware that 10-digit dialing will be required for all calls, even those within the same area code.

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  4. Will the 410 / 443 / 667 area code overlay affect my service?

    No, 410 and 443 customers will only need to continue to dial the area code for all calls. Your current area code and 7-digit telephone number will not change. The price of a call, your wireless plan and coverage area, and other rates and services will not change because of the 667 overlay. All local calls will remain local, regardless of the number of digits dialed.

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  5. When will the 410 / 443 / 667 area code overlay go into effect?

    As early as March 24, 2012, new lines or services may be assigned a phone number with the 667 area code. Calls within the new 667 area code will require dialing the area code and 7-digit phone number.

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  6. What will remain the same after the 410 / 443 / 667 area code overlay change?

    The following items will not change:

    • Your area code and 7-digit phone number

    • The price of a call, your coverage area and your other rates and services
    • Any 3-digit number that may be available in your community can still be dialed with just three digits (e.g., 211, 311, 411, 511, 611, 711, 811, 911)

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  7. When will 667 telephone numbers be assigned for the area code overlay change?

    Beginning March 24, 2012, new phone lines or services may be assigned numbers with the 667 area code. If you are assigned a phone number with the 667 area code, you will need to dial the area code for all calls, including calls to another 667 number.

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  8. How will customers with a 410, 443 or 667 area code need to dial calls after the 410 / 443 / 667 area code overlay change?

    Since three area codes will serve the same area, if you have a 410, 443 or 667 area code, you will need to dial the area code for ALL calls, including calls within your same area code.

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  9. Where can I find more information about the 410 / 443 / 667 area code overlay?

    If you have any questions about the 410, 443 and 667 area code overlay, please contact us at (800) 922-0204. You may also visit the Maryland Public Service Commission website for possible updates.

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