227 Area Code

The 227 area code is a telephone area code serving the western part of Maryland.

Federal Data Sources

Federal Data

State Data Sources

State Data

County Data Sources

County Data

City Data Sources

City Data

/ 227

Area Code 227 Location: Maryland

The 227 area code covers the western part of Maryland, including the Greater Washington, D.C. metro area and rural western Maryland.

Counties Served by Area Code 227:

  • Allegany County
  • Charles County
  • Garrett County
  • Montgomery County
  • Prince George's County
  • St. Mary's County
  • Washington County
  • Frederick County (most of)
  • Howard County (western)
  • Carroll County (slivers of southwestern)
  • Anne Arundel County (western slivers)

Major Cities in the 227 Service Area:

  • Frederick
  • Gaithersburg
  • Rockville
  • Bethesda
  • Germantown
  • Silver Spring
  • Hagerstown
  • Cumberland
  • Waldorf
  • Landover
  • Potomac

Other Cities and Towns:

  • Laurel
  • Marlboro (Upper Marlboro)
  • Mount Airy
  • New Windsor
  • Union Bridge

Overlay System

Area code 227 is an overlay to area codes 301 and 240. Area code 301 was created in 1947, 240 was added in 1997, and 227 was introduced on June 14, 2023. Ten-digit dialing is required for all local calls within this region.

Area Code 227 Location Map

Area Code 227 Location on Maryland Map

Area code 227 is a general purpose code which was placed in service on June 14, 2023.

227 Area Code Prefixes

Our Maryland phone number lookup service will analyze the three-digit prefix of any 227 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Maryland geographic region, and local calling area associated with the phone number.

Phone numbers follow the following structure under the North American Numbering Plan:

  • NPA- area code (where the number was originally assigned)
  • NXX - Central office code that locates the specific neighborhood and identifies the service provider
  • XXXX - Subscriber number identifies the individual phone line within that local exchange

Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.

Prefixes by Company

Company Number of Prefixes

Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.

Prefixes by Rate Center

Rate Center Number of Prefixes

Other Maryland Area Codes

Browse other Maryland area codes: