240 area code

Get a local phone number in Rockville, MD

Biggest city:

Rockville

State:

Maryland

Major Cities:

Baltimore, Columbia, Waldorf, Silver Spring, Frederick

Timezone:

Eastern (GMT -5)

Population:

66,705

Average Income:

$141,153

Zip codes:

20847

20857

Unemployment Rate:

1.60%

Nearby area codes:

301

278

Get a 240 phone number

📲 Get a 240 number: $7/mo

240 area code summary

Area code 240 is an overlay for Maryland’s 301 area code, serving the western and southern parts of the state, including cities like Frederick, Hagerstown, Waldorf, and parts of Montgomery and Prince George’s counties. This area includes Washington, D.C. suburbs and rural communities, offering a mix of government contractors, commuter towns, and agricultural zones. The 240 area code supports institutions like the National Institute of Standards and Technology (NIST), U.S. Army installations, and satellite campuses of major universities. It also encompasses technology corridors and biohealth clusters along I-270. With growing demand from mobile users and new businesses, the 240 overlay ensures numbering availability without disrupting established regional identities. Whether you’re serving the public sector, scientific research, or suburban consumer markets, a 240 number gives your business solid footing in a diverse and strategically important part of Maryland.

Fun fact 💡

Rockville’s town square hosted a duel between congressmen in 1832, a wild tale.

🏢First Phone Company:

Bell Atlantic (later Verizon)

📲 Get a 240 number: $7/mo