The three local operating companies of the Chesapeake and Potomac Telephone Company (C&P Telephone, later part of Bell Atlantic and now Verizon) cooperated in ended code protection on October 1, 1990, for entire area and required ten-digit dialing for all local calls between Maryland, the District of Columbia, and Virginia. Area code 202 was no longer usable for suburban points. Local calls within Maryland did not require the area code.
The three local operating companies of the Chesapeake and Potomac Telephone Company (C&P Telephone, later part of Bell Atlantic and now Verizon) cooperated in ending area code protection on October 1, 1990, for the entire region and mandated ten-digit dialing for all local calls between Maryland, the District of Columbia, and Virginia. Area code 202 was no longer usable for suburban points. Local calls within Maryland did not require the area code.