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Area code 301

Area code 301 serves Maryland, including Washington Zone 03, Washington Zone 02 and Washington 236 Zone 13 (Eastern time). It has been in service since January 1, 1947 and shares its area with 240 and 227.

Numbers starting with 301 drew 1,210 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 1,169 complaints to the FCC since November 2023. The number on your screen can be faked, so a 301 number proves nothing about where a call came from.

Location
MarylandBaltimore-Columbia-Towson, MD Metropolitan Statistical Area and Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area
Time zone
Eastern
In service since
January 1, 1947
Overlay
Same area as 240, 227
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
784 of 792held by 31 carriers
Projected to run out
3Q 2043NANPA forecast 2026.2

Complaints about 301 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 301. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

1,210

FCC complaints since November 2023

1,169

Different 301 numbers reported

2,064

FCC complaints naming a 301 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202332
December 202318
January 202421
February 202420
March 202433
April 202436
May 202449
June 202463
July 2024109
August 202434
September 202428
October 202435
November 202420
December 202412
January 202523
February 202530
March 202521
April 202518
May 202529
June 202525
July 202525
August 202527
September 202523
October 20251
November 202518
December 202527
January 202620
February 202631
March 202652
April 202651
May 202634
June 202633
July 202635
August 202618
September 202629
October 202667

What people said 301 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 702 of 1,210 reports were robocalls.

Show as a table
SubjectReports
Other543
Calls pretending to be government, businesses, or family and friends140
Dropped call or no message135
Reducing your debt (credit cards, mortgage, student loans)94
Home improvement and cleaning62
Warranties and protection plans52

Most reported 301 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 301

NANPA lists 64 rate centers for 301. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Washington Zone 03112
  • Washington Zone 0288
  • Washington 236 Zone 1353
  • Washington Zone 1052
  • Washington Zone 0447
  • Frederick37
  • Washington Zone 0537
  • Gaithersburg33
  • Washington Zone 1130
  • Waldorf25
  • Laurel 23623
  • Washington Zone 0623
  • Hagerstown21
  • Washington 236 Zone 1421
  • Washington Zone 1215
  • Cumberland14
  • Lexington Park Great Mills11
  • Washington 238 Zone 1410
  • Washington Zone 1610
  • Ashton 2369
  • Leonardtown9
  • Myersville9
  • Oakland8
  • Washington 236 Zone 157
Show all 64 rate centers

Damascus 236, Indian Head, Laurel 238, Brandywine, Damascus 240, Washington 238 Zone 15, Keedysville, La Plata, Mechanicsville, Ashton 238, Brunswick, Buckeystown, Clear Spring, Friendsville, Frostburg, Kitzmiller, Mount Airy, New Market, Poolesville, Walkersville, Baltimore, Bittinger, Emmitsburg, Flintstone, Grantsville, Hancock, Highfield, Hughesville, Lonaconing, Mccoole, Middletown, Mount Savage, Nanjemoy, Ridge, Smithsburg, Thurmont, Tompkinsville, Washington 238 Zone 13, Westernport, Williamsport.

Phone companies holding 301 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 51% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 31 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
Verizon Maryland, Inc.463
Cellco Partnership dba Verizon Wireless - MD51
New Cingular Wireless PCS, LLC - DC47
Mcimetro Access Transmission Services LLC40
Omnipoint Communications Cap Operations, LLC31
Teleport Communications America, LLC - DC31
Level 3 Communications, LLC - MD15
Metropcs, Inc.14

When today's 301 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200210
20033
20046
20053
20068
20075
20081
20091
20101
20114
20122
20142
20152
20171
20181
20191
20229
20231
20251

Check a 301 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Maryland

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show