Area code
Area code 301 — Frederick & Montgomery County, MD
Maryland · in service since 1947
Area code 301 covers Frederick & Montgomery County, MD. It is an overlay: 240, 227 serve the same area, so neighbors can have different area codes.
Local time in Frederick & Montgomery County
Spam reports from Sep 23 – Oct 22, 2026
Average #212 of 461 codes
444 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneEastern Time
- Local calls10 digits
- Prefixes800 assigned
- Runs out~1Q 2041
- Unwanted call?Block & report
Spam call reports about 301 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 24 |
| Sep 14 | 113 |
| Sep 21 | 136 |
| Sep 28 | 84 |
| Oct 5 | 92 |
| Oct 12 | 86 |
| Oct 19 (4 days) | 88 |
Compared with all codes
- Robocalls
- 64%all codes 75%
- Callers with the same code
- 55%all codes 35%
- Rank by complaints
- #212of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 21163 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Calls pretending to be government, businesses, or family and friends | 65 10% | |
| Dropped call or no message | 61 10% | |
| Reducing your debt (credit cards, mortgage, student loans) | 42 7% | |
| Warranties & protection plans | 29 5% | |
| Home improvement & cleaning | 26 4% | |
| Medical & prescriptions | 21 3% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Maryland | 410 66% | |
| Virginia | 26 4% | |
| California | 17 3% | |
| Pennsylvania | 15 2% | |
| Texas | 14 2% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 301 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| WSHNGTNZN3 | — | — | 112 |
| WSHNGTNZN2 | — | — | 88 |
| WSNG236Z13 | — | — | 53 |
| WSNGTNZN10 | — | — | 52 |
| WSHNGTNZN4 | — | — | 48 |
| FREDERICK | Frederick | Frederick County | 37 |
| WSHNGTNZN5 | — | — | 37 |
| GAITHERSBG | Gaithersburg | Montgomery County | 33 |
| WSNGTNZN11 | — | — | 30 |
| WALDORF | Waldorf | Charles County | 25 |
Plus 54 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- Maryland
- Assigned by NANPA
- 1947
- Local dialing
- 10 digits (NANPA: 10D)
- NANPA planning letters
- PL-603
Source: NANPA, NPA database of Oct 24, 2026.
Is 301 running out of numbers?
Previous forecast (October 2025): 2040, moved later by 1 year.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 301 prefixes
The five largest of 31 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Verizon Maryland, Inc. | 465 58% | |
| Verizon Wireless | 51 6% | |
| New Cingular Wireless PCS, LLC | 47 6% | |
| Mcimetro Access Transmission Services LLC | 43 5% | |
| Teleport Communications America, LLC | 33 4% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 301
What area code is 301?
A Maryland area code, in service since 1947.
Where is 301 area code, and what time zone is it in?
Frederick & Montgomery County, MD; Eastern Time.
Why am I getting spam calls from 301?
444 FTC complaints from Sep 23 – Oct 22, 2026, most often about impostors (not verified by the FTC; caller ID can be spoofed).
Will 301 get a new area code?
NANPA forecasts exhaust in 1Q 2041; no relief planning listed.