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US area code · Maryland

301 area code

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.

Number holders in area code 301

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 800 prefixes are in use in 301, shared by 33 companies. The largest holders:

CompanyPrefixesShare
Verizon Maryland, Inc.46558%
Cellco Partnership Dba Verizon Wireless516%
New Cingular Wireless PCS, LLC476%
Mcimetro Access Transmission Services LLC405%
Omnipoint Communications Cap Operations, LLC314%
Teleport Communications America, LLC314%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 301 numbers

Reports to the FTC, last 30 days
426
Recorded messages or robocalls
54%
Rank among area codes
#233 of 670
Most reported subjects
Other (158)
Calls pretending to be government, businesses, or family and friends (59)
Reducing your debt (credit cards, mortgage, student loans) (48)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

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

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