District of Columbia Area Codes
Directory of all 2 telephone area codes assigned to District of Columbia.
District of Columbia phone numbers are served by 2 area codes operating in the Eastern timezone.Because an overlay is active, 10-digit dialing is mandatory across much of the state. No area codes in District of Columbia are currently flagged as high-risk scams.
Most populated prefix: area code 202 (District of Columbia)
All Area Codes in District of Columbia
Major Cities Served by District of Columbia Area Codes
The most populous urban centers and census places covered by District of Columbia's area codes, ranked by population.
District of Columbia Area Code FAQs
Quick answers to common questions about District of Columbia telephone area codes.
How many area codes does District of Columbia have?
District of Columbia has 2 area codes: 202, 771.
What timezone do District of Columbia area codes use?
District of Columbia area codes operate in the Eastern timezone.
What is the most populated area code in District of Columbia?
Area code 202 is the most populous prefix in District of Columbia based on covered city population.
Which District of Columbia area codes share an overlay?
202 and 771. Overlay codes serve the same area, which is why 10-digit dialing is required.
Are there scam area codes in District of Columbia?
District of Columbia has no area codes currently flagged as high-risk scams.
About District of Columbia Area Codes & Phone Dialing Rules
When placing calls within District of Columbia, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.