Area code 301

Area code 301 at a glance

Area code 301 is a geographic area code in Maryland, in service since January 1, 1947, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 301 and 240 and 227 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Frederick, Gaithersburg, Hagerstown, Cumberland, and Leonardtown. By population, its largest named places are Baltimore, Frederick, Gaithersburg, Hagerstown, and Cumberland.

Cities and towns in area code 301

301 holds 21% of the 3,730 central office codes assigned in Maryland, the 3rd most of the state's 6 codes. 29 Census places could be matched to rate centers with 301 exchanges; the most populous are Baltimore (568,000), Frederick (89,537), Gaithersburg (70,686), and Hagerstown (43,909). For a storefront or service area inside 301, the place pages show which prefixes are rated local there.

Ten-digit and seven-digit dialing in 301

According to NANPA's dialing-plan data, local calls within 301 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere. NANPA's dialing-plan note for this code reads: "1+10 digit dialing for all calls permissible at service providers discretion."

Carriers with 301 numbers

31 carriers hold the 784 central office codes assigned in 301. Verizon Maryland, INC. has the most, with 463 (59%). 397 of the codes (51%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.

Local calling areas in 301

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 301 has codes in 64 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.

How full is area code 301?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 784 are assigned in 301, 98% of 800. 11 were assigned in 2020 or later.

A local 301 number on Callata

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

If you already have a number in area code 301, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.