Area codes 202 and 771 (Washington, D.C.)

Coverage and characteristics

Both codes cover the same geographic area: the entire District of Columbia. Under the North American Numbering Plan format, telephone numbers in this region use the pattern NPA-NXX-XXXX where NPA is 202 or 771. The overlay means callers must use ten-digit dialing (area code + local number) for local calls within the District.

History and development

The original system of area codes was developed in the 1940s by AT&T as part of a continental plan to simplify long-distance routing. Area code 202 was assigned in October 1947 and has remained tied to the nation’s capital since then. When demand for new numbers grew, regulators opted to introduce 771 as an overlay rather than split the region, and the overlay went into service on November 9, 2021.

Why an overlay was chosen

Overlays preserve existing telephone numbers and reduce disruption for businesses and residents because no one has to change their number. The trade-off is a requirement for ten-digit dialing for local calls and the coexistence of two different NPAs in the same geographic area. Overlays have been a common solution across many metropolitan areas in the North American Numbering Plan.

Practical effects and examples

• Existing 202 numbers continued to work unchanged after the overlay.
• New assignments in the District may receive either 202 or 771, depending on availability.
• Local callers must dial the area code for all calls, even to adjacent numbers.

For broader context about telephone numbering and area codes see general resources on area codes, information about the city and federal institutions in Washington, D.C., and background on the plan’s origin developed by AT&T.

Notable facts: 202 is widely recognized in media and public discourse as shorthand for the U.S. federal government and matters based in the capital. The overlay code 771 extends numbering capacity while maintaining that long-standing association.