Area Code 240
Rockville, MD — Maryland
Area code 240 serves Rockville and Maryland. Get a local 240 number to build instant presence in this market.
Introduced in 1997 as an overlay for western Maryland's 301 region, 240 was among the earliest overlay codes in the nation. It served the rapidly growing DC suburbs of Montgomery and Frederick counties.
State
Maryland (MD)
Capital: Annapolis
Time Zone
ET
Eastern Time (ET)
Region
Northeast
US Census region
Code Type
Geographic
Original area code
Where does area code 240 cover?
Area code 240 serves communities across Maryland. Cities below represent the primary coverage area per the NANP.
- Rockville
- Frederick
- Gaithersburg
- Germantown
- Hagerstown
Maryland phone number landscape
Maryland's area codes cover Baltimore's biotech corridor, Montgomery County's pharmaceutical hub, and the Eastern Shore — all within commuting distance of Washington DC.
Number format
When dialing from outside the US, prefix with +1. Within the US, dial all 10 digits including the area code.
History of Area Code 240
Introduced in 1997 as an overlay for western Maryland's 301 region, 240 was among the earliest overlay codes in the nation. It served the rapidly growing DC suburbs of Montgomery and Frederick counties.
Why get a 240 area code number?
A local 240 number gives your business a genuine connection to the Maryland market — without the overhead of a physical location.
Local Market Access
Reach Rockville customers and businesses with a familiar local number. Rockville sits at the heart of Maryland's I-270 biotech corridor, home to the FDA and hundreds of life-sciences firms. Clinical-research organizations and biopharma vendors use a 240 number to signal proximity to federal regulators.
Professional Credibility
A 240 number anchors your business in Rockville and Maryland, giving clients and partners a recognizable local point of contact that builds immediate professional trust.
Higher Answer Rates
Local area codes are far less likely to be blocked. A 240 number keeps your outreach out of the spam folder.
Flexible Operations
Start with one 240 number and add more as you grow — all managed from a single letsdial dashboard.
How to obtain a 240 phone number.
Step 01 · Sign up
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Benefits of a local Maryland number
A 240 area code tells Maryland customers you're local and easy to reach.
- Local 240 numbers get answered more often than toll-free or out-of-state calls.
- Build local trust and brand recognition without a physical office.
- Keep your personal number private with a dedicated 240 business line.
Why local numbers win
Frequently asked about 240
Area code 240 covers Rockville, Frederick, Gaithersburg, Germantown, Hagerstown in Maryland. It is the primary area code for this region.
Ready to call Maryland your market?
Get a local 240 number for your business in minutes. No contracts, no hardware — just a trusted local presence in Maryland from day one.
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