301 area code
Get a local phone number in Baltimore, MD
Biggest city:
Baltimore
State:
Maryland
Major Cities:
Baltimore, Germantown, Silver Spring, Gaithersburg, Rockville, Bethesda, Wheaton, Potomac, Olney, Takoma Park, Damascus, Colesville, Clarksburg, Glenmont, Poolesville, Ashton.
Timezone:
Eastern (GMT -5)
Population:
563,455
Average Income:
$79,399
Zip codes:
21201
21299
Unemployment Rate:
2.40%
Nearby area codes:
240
410
301 area code summary
Area code 301 serves western and southern Maryland, including Montgomery, Frederick, Prince George’s, and Charles counties. It is one of Maryland’s original area codes, established in 1947, and now shares the region with overlay 240. The 301 area is closely tied to the Washington, D.C. metro area and supports a large federal workforce, tech sector, and healthcare ecosystem. Major institutions include the National Institutes of Health (NIH), the FDA, and the University of Maryland system. Montgomery County is one of the wealthiest in the U.S., home to biotech companies, research parks, and startups. Frederick blends historic charm with logistics and manufacturing. Prince George’s County, meanwhile, has become a hub for aerospace and government contractors. A 301 number conveys regional authority and connection to one of the most educated, affluent, and economically powerful suburban areas in the United States. Whether you're in defense, tech, education, or medicine, it places your identity at the heart of Maryland’s innovation economy.
Fun fact 💡
Frederick’s Monocacy National Battlefield saw a pivotal 1864 Civil War clash.
🏢First Phone Company:
Chesapeake & Potomac Telephone Company (later Verizon)
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