Area Codes in Maryland
6 active area codes · United States · Eastern Time
Maryland has 6 active area codes in the North American Numbering Plan: 227, 240, 301, 410, 443, 667. All area codes in Maryland observe Eastern Time.
6
Area Codes
1
Time Zone
6
Overlay Codes
227
Frederick
Overlay
Eastern
240
Frederick
Overlay
Eastern
301
Frederick
Overlay
Eastern
410
Baltimore
Overlay
Eastern
443
Baltimore
Overlay
Eastern
667
Baltimore
Overlay
Eastern
About Maryland Area Codes
Maryland currently has 6 active area codes in the North American Numbering Plan: 227, 240, 301, 410, 443, 667. These operate in the Eastern Time time zone.