Gaithersburg, Maryland
Eastern Time Zone (UTC-5) · MD · —
240
1997
Germantown
Maryland
Eastern
Overlay
301
⬡ 1947
Silver Spring
Maryland
Eastern
+1
227
2023
Silver Spring
Maryland
Eastern
Overlay
About Area Codes in Gaithersburg, Maryland
Gaithersburg, Maryland is served by 3 area codes: 240, 301, 227. When multiple area codes serve the same geographic area, it typically indicates overlay codes have been added to accommodate growing demand for phone numbers. All local calls within Gaithersburg require 10-digit dialing. The city is in the Eastern time zone (UTC-5).
Other cities in area code 240
Frequently Asked Questions
What area code is Gaithersburg, Maryland?
Gaithersburg, Maryland uses area codes 240 and 301 and 227.
What time zone is Gaithersburg in?
Gaithersburg is in the Eastern time zone (UTC-5).
Do I need to dial 10 digits when calling Gaithersburg?
Yes, all local calls in Gaithersburg require 10-digit dialing because the area is served by multiple overlay area codes.
When was area code 240 created?
Area code 240 was established in 1997 as an overlay code, added to the same geographic region as an existing code to provide more phone numbers.
What cities share area code 240 with Gaithersburg?
Other cities sharing area code 240 with Gaithersburg include Bethesda, Bowie, College Park, Cumberland, Frederick, among others.
Gaithersburg, MD · Eastern Time Zone