Get a local business phone number in Gaithersburg, MD

Gaithersburg area codes

Gaithersburg city is a Census place in Montgomery County, Maryland, with an estimated 70,686 residents in 2024. NANPA lists 80 exchanges for its rate center across 3 area codes; 240 has the most (40, 50%). 240 is part of an overlay with 227 and 301, so a new local number in Gaithersburg may carry any of those codes depending on which have numbers available. Gaithersburg 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.

Phone carriers in Gaithersburg

19 carriers hold the 80 exchanges assigned to Gaithersburg's rate center. Verizon Maryland, INC. has the most, with 25. 59 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.

Exchanges (NPA-NXX) assigned in Gaithersburg

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Gaithersburg's rate center (GAITHERSBG). The earliest assignment date recorded in the file for these codes is 2001. 12 of the 80 were assigned in 2020 or later.

When Gaithersburg's exchanges were assigned

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

What makes a number local to Gaithersburg

NANPA ties every exchange to a rate center. For Gaithersburg that is GAITHERSBG, so a number from one of these exchanges reads as local to people in and around Gaithersburg.

Keeping an existing Gaithersburg number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 240 when you pick it.

Businesses around Gaithersburg

Gaithersburg 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).

Business phone service in Gaithersburg

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

If you already have a number in Gaithersburg, 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.