(240) Area Code Business Phone Numbers

Get a local (240) number for Frederick and the surrounding western Maryland and DC suburb communities. Introduced in 1997 as an overlay for the 301 region, the 240 code covers some of the fastest-growing zip codes in the state.

Get a 240 Number

About the 240 Area Code

Area Code240

Established1997

Primary CityFrederick, MD

StateMaryland

TimezoneEastern

The 240 area code was added in 1997 as an overlay for 301, which had covered western Maryland since the split from 410. Today it shares territory across Frederick, Montgomery, and Prince George's counties, so anyone dialing inside the region needs all ten digits. If you see a 240 number pop up on caller ID, odds are the person on the other end is somewhere between the Potomac and the Pennsylvania line.

Frederick has quietly turned into one of the more interesting business markets on the East Coast. The county sits at a $15.4 billion GDP, anchored by Fort Detrick and the Frederick National Laboratory for Cancer Research, with biotech names like AstraZeneca, Kite, and Thermo Fisher all operating locally[1]. The city itself has grown to roughly 94,796 residents and is expanding around 2.97% a year, which is fast for Maryland[2].

When you're running a small business in Frederick or nearby Gaithersburg, a 240 number tells people you're actually here. Customers ignore unfamiliar toll-free calls, but a local prefix gets picked up. Tonet gives you a real (240) number that rings on your laptop, your desk phone, or your cell without changing your setup.

Cities Served by the 240 Area Code

The 240 code covers 26 cities across western and central Maryland, from Cumberland out west to the DC suburbs in Prince George's County. Coverage overlaps with 301, so most residents share both prefixes.

Aspen Hill, MD North Bethesda, MD Bowie, MD Chillum, MD Clinton, MD College Park, MD Cumberland, MD Fairland, MD Fort Washington, MD Frederick, MD Gaithersburg, MD Germantown, MD Greenbelt, MD Hagerstown, MD Landover, MD Montgomery Village, MD South Laurel, MD North Potomac, MD Olney, MD Potomac, MD Rockville, MD Silver Spring, MD Saint Charles, MD Suitland, MD Waldorf, MD White Oak, MD

Business Phone Features for Frederick Companies

Whether you're a contractor working out of a truck in Hagerstown or running a clinic off East Patrick Street, these are the tools you actually use day to day.

Auto Attendant

Route calls to sales, service, or billing without paying someone to sit at a front desk. Set separate menus for after-hours or holidays.

Call Recording

Keep recordings of estimates, service calls, or intake conversations. Handy for training new staff and settling disputes over what was quoted.

AI Transcription

Every voicemail arrives as text in your inbox. Skim it between meetings instead of holding the phone to your ear on speaker.

Business SMS

Text customers from your (240) number, not your personal cell. Great for appointment reminders around Montgomery County commuters.

Mobile App

Answer the office line from anywhere. Calls placed from the app show your business number, so your cell stays private.

Daily Billing

Plans start at $10 per user per month, billed a bit each day. No annual contract, and extra numbers are $2.50/month each.

Frequently Asked Questions

Can I get a (240) number if my business isn't physically in Frederick?

Yes. Tonet doesn't require a Maryland address to assign a 240 number. Plenty of remote teams pick a local prefix to build presence in a market before they open an office.

What's the difference between 240 and 301?

They cover the exact same geography. 301 has been around since 1947 and 240 was overlaid on top of it in 1997 because western Maryland ran out of numbers. Both are considered local.

Do I have to dial all ten digits inside the 240 area?

Yes. Because 240 and 301 overlay the same region, seven-digit dialing was retired years ago. Always dial ten digits, even for a neighbor.

Can I keep my existing 240 or 301 number?

Yes, porting is free. You fill out a form, keep using your old service for a couple weeks, then it flips over to Tonet without customers noticing.

How much does a (240) business line cost?

User plans start at $10 per user per month, billed daily. Additional phone numbers are $2.50 each per month. No contracts, cancel any time.

Sound like a Frederick local from day one

Pick a (240) number in a couple minutes and start taking calls today.

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