227
Complete Guide to Central Maryland
Discover everything about the 227 area code — its Maryland coverage, overlay history, time zone, and how to quickly activate a local number with Rozper today.
MD · 6 Area Codes
Maryland
Area Codes
Maryland's economy leans on biotech and federal contracting, centered around Baltimore, Columbia, and Silver Spring. Get a local virtual phone number with any Maryland area code.
6 area codes
Original code 301 · 1947
Capital: Annapolis
Carrier-grade network
// Why MD Virtual Numbers
Why businesses choose a Maryland virtual number
A local Maryland number shows callers which part of the state you serve.
1947
301 first assigned
301 came first, in 1947
301 was Maryland's original area code, assigned in 1947. The newest, 667, arrived in 2012. Each of the 6 codes below maps to its own part of the state, so the code you pick shows which region you serve.
01 — Maryland at a Glance
Maryland, by the numbers.
Maryland got a single area code, 301, for the whole state in 1947. In 1991, 410 split off for Baltimore and the Eastern Shore, leaving 301 for the west and DC suburbs.
Rather than split further, Maryland turned to overlays: 240 was added atop 301 in 1997 for Montgomery and Prince George's counties, and 443 was added atop 410 in 1999.
By 2012, both regions needed more numbers, so 667 was added as a second overlay across the 410/443 area.
Maryland now runs two three-code overlay complexes: 301/240 in the west and 410/443/667 in the east.
Did you know?
Maryland runs two separate three-code overlay complexes side by side, so knowing whether a Marylander's number starts with 301/240 or 410/443/667 tells you roughly which half of the state they live in.
// 6 area codes
Maryland Virtual Phone Numbers
Select any area code to get a local virtual number for that region of Maryland.
240
Maryland's 301/227 Overlay Explained
240 overlays 301 across western, central and southern Maryland, from the D.C. suburbs to Hagerstown and Waldorf. It started in 1997 as Maryland's first overlay, and 227 joined it in 2023.
301
Washington D.C.'s Maryland Suburbs
See exactly where the 301 area code sits in Maryland, how it split and gained overlays since 1947, which D.C.-suburb cities it covers, and why 10-digit dialing is required.
410
Baltimore & the Chesapeake Prefix
See exactly where the 410 area code sits in Maryland, how it split from 301 in 1991, which Baltimore and Eastern Shore cities it covers, and why 10-digit dialing is required.
443
Baltimore's Overlay Twin, Explained
See exactly where the 443 area code sits in Maryland, how it launched as a 410 overlay in 1997, which Baltimore and Eastern Shore cities it covers, and why 10-digit dialing is required.
667
Baltimore's Newest Number, Explained
See exactly where the 667 area code sits in Maryland, how it joined the 410/443 stack in 2012, which Baltimore and Eastern Shore cities it covers, and why 10-digit dialing is required.
// Get Started
Get a Maryland number in 3 steps
From choosing a code to setting up call routing.
- 01Step 01
Choose a MD area code
Browse the Maryland area codes above and pick the region that best serves your customers.
- 02Step 02
Select your number
Choose from the numbers available in your selected area code.
- 03Step 03
Set up routing
Configure call routing, business hours, and voicemail from your Rozper dashboard for your Maryland number.
Frequently Asked
Maryland number questions answered.
Everything you need to know before getting a Maryland virtual phone number.
Maryland has 6 active area codes: 227, 240, 301, 410, 443, 667. Rozper offers virtual phone numbers in these codes, which you can browse and choose from one dashboard.
301 is Maryland's original area code, assigned in 1947. The most recent addition, 667, followed in 2012.
No. Virtual numbers are location-independent. A business based anywhere in the U.S. or internationally can get a Maryland area code and route calls to any device, team, or call center.
Maryland's capital is Annapolis, and the state keeps Eastern time. Its population is about 6,180,000, across 24 counties.
Maryland's economy centers on biotech and federal contracting, with Baltimore, Columbia, and Silver Spring as the main business hubs. Maryland is home to the National Institutes of Health, just outside DC.
Questions about Maryland numbers? Get in touch.
// Next door
States that border Maryland
Customers and teams near the Marylandline often use a neighbouring state's codes. Here are the area codes next door.
Ready for a Maryland number?
Pick a Maryland area code and talk to us about setting up your number.