Get a local business phone number in Frederick, MD

What area code is Frederick, MD?

Frederick city is a Census place in Frederick County, Maryland, with an estimated 89,537 residents in 2024. NANPA lists 88 exchanges for its rate center across 3 area codes; 240 has the most (43, 49%). 240 is part of an overlay with 227 and 301, so a new local number in Frederick may carry any of those codes depending on which have numbers available. Frederick is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 240 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Frederick exchanges by carrier

20 carriers hold the 88 exchanges assigned to Frederick's rate center. Verizon Maryland, INC. has the most, with 28. 67 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Frederick phone prefixes

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Frederick. The earliest assignment date recorded in the file for these codes is 2001. 12 of the 88 were assigned in 2020 or later.

When Frederick's exchanges were assigned

Assignment dates show when each block of Frederick numbers was added to the local supply.

Rate centers and local calling in Frederick

Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Frederick's numbers are rated to the FREDERICK rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Frederick number.

If your business already has a Frederick number, porting it to Callata is free and keeps it on your cards, listings and vehicles.

Who does business near Frederick

Frederick is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metro area, home to 6.4 million people in 2024. County Business Patterns counted 159,002 business establishments in the Washington, DC-VA-MD-WV metro area in 2023, employing 2,863,486 people. The largest sectors by establishment count are professional, scientific, and technical services (34,327), health care and social assistance (19,078), and other services (except public administration) (18,064).

A Frederick 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 Frederick, 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.

The comparison below uses 18 users, the rounded average establishment size in the Washington, DC-VA-MD-WV metro area. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.