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US area code · Maryland

Area code 301

Where the 301 area code is, its overlay and how to dial a +1 301 number from anywhere.

CoversAspen Hill, MarylandTime zoneEastern (ET)TypeOverlay
Quick answer

The 301 area code is in Aspen Hill, Maryland, United States (Eastern (ET)). To call from abroad: +1 301 555-0123. It is an overlay, so all 10 digits are dialled.

StateMaryland
Main areaAspen Hill
Time zoneEastern (ET)
TypeOverlay
10-digit dialingRequired
In service since01-Jan-1947

The 301 area code is a geographic North American Numbering Plan (NANP) code covering Aspen Hill, Maryland. It has been in service since 01-Jan-1947 and sits in the Eastern (ET) time zone.

Overlay 301 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

301227240

How to dial a 301 number

From abroad+1 301 555-0123
Within the US / Canada1 301 555-0123
Locally (same area)301 555-0123

Cities in the 301 area code

A 301 number is usually in one of these places in Maryland — 6 counties.

Aspen HillBowie Prince GeorgesChillumClinton Prince GeorgesCollege Park Prince GeorgesCumberland AlleganyFairlandFort Washington Prince GeorgesFrederick FrederickGaithersburg MontgomeryGermantown MontgomeryGreenbelt Prince GeorgesHagerstown WashingtonLandoverMontgomery Village MontgomeryNorth BethesdaNorth PotomacOlney MontgomeryPotomac MontgomeryRockville MontgomerySaint CharlesSilver Spring MontgomerySouth LaurelSuitland Prince GeorgesWaldorf CharlesWhite Oak

Other Maryland area codes

227240410443667

Frequently asked questions

Where is the 301 area code?

The 301 area code is in Aspen Hill, Maryland, United States (Eastern (ET)).

Is 301 an overlay area code?

Yes. 301 overlays the same region as 227, 240, so callers dial all 10 digits.

Do I have to dial 10 digits for 301?

Yes — dial the area code plus the seven-digit number.

How do I call a 301 number from another country?

Dial your exit code (or +), then 1, then 301, then the number: +1 301 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 301 number does not pinpoint a street or ZIP code.

Missed a call from +1 301?

In the 30 days to September 24, 2026, 426 unwanted calls showing a 301 number were reported to the US Federal Trade Commission, 54% of them recorded messages or robocalls. That puts 301 at #233 of 670 area codes reported.

Other158
Calls pretending to be government, businesses, or family and friends59
Reducing your debt (credit cards, mortgage, student loans)48
Dropped call or no message42
Before you call back
  • If you do not know anyone in Maryland, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 301 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 301 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 301:

Verizon Maryland, Inc. 465Cellco Partnership Dba Verizon Wireless 51New Cingular Wireless PCS, LLC 47Mcimetro Access Transmission Services LLC 40Omnipoint Communications Cap Operations, LLC 31Teleport Communications America, LLC 31

About 12.4% of the 800 prefixes in use belong to mobile carriers: a 301 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 301 — cities & rate centres