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US area codes

District of Columbia area codes

A checked list of 2 in-service geographic area codes in District of Columbia, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in District of Columbia

District of Columbia has 2 geographic area codes in service: 202, 771. 202 is the oldest, dated 1947, and 771 the newest, dated 9 Nov 2021.1 All of District of Columbia's codes are on Eastern time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
202DC1947771Eastern10 digits
771DC9 Nov 2021202Eastern10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in District of Columbia

  • Before 1960: 202 (1947)
  • 2020s: 771 (9 Nov 2021)

District of Columbia's in-service overlay group is 202/771.1

  • 202/771: 202 (1947) was joined by 771 on 9 Nov 2021.

Dialing in District of Columbia

Local calls within a single area code in District of Columbia (202, 771) are all recorded as 10 digits. From any of District of Columbia's codes, local calls to another area code are all recorded as 10 digits.1

Neighbours of District of Columbia

Regions that border District of Columbia:

  • Maryland: 6 codes (227, 240, 301, 410, ...)
  • Virginia: 10 codes (276, 434, 540, 571, ...)

Rules that apply to every region are on the area-code reference.

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Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

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What Phone Number to Use on Google Business Profile
A 2026 U.S. guide to choosing a Google Business Profile primary number, evaluating tracking versus a stable main line, checking account ownership, and testing calls before and after an edit.

Articles on this topic

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A 2026 US diagnostic guide to Spam Likely labels, covering CNAM, STIR/SHAKEN, carrier testing, spoofing, and free redress routes.
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How to Check Phone Number History for a New Business
Learn how to check phone number history in 2026 before publishing a new business number: verify public listings, test calls, compare provider remedies and decide whether to accept or replace it.
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Business Call Forwarding to Cell Phone: Caller ID and Voicemail
A 2026 test guide for business calls forwarded to staff mobiles: identify the incoming number, prevent personal voicemail pickup, verify callbacks, and compare routing options.

Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
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