How many area codes does Maryland have?

Maryland has 6 active area codes: 410/443/667 (Baltimore, Annapolis, Eastern Shore) and 301/240/227 (DC suburbs — Bethesda, Rockville, Silver Spring, Frederick — and western Maryland).

What is the original Maryland area code?

301 — assigned in 1947 when the NANP launched. It originally covered the entire state. Today it covers the DC suburbs and western Maryland; 240 and 227 are its overlays.

What is Baltimore's area code?

Baltimore uses 410 (split from 301 in 1991), 443 (1997 overlay) and 667 (2012 overlay). All three cover Baltimore city, Baltimore County, Anne Arundel County and the Eastern Shore.

What area code is Bethesda, Rockville and Silver Spring?

301 — original 1947 — covers the inner DC suburbs (Montgomery and Prince George's counties) plus Frederick and western MD. 240 is the 2001 overlay; 227 was added in 2023.

What area code is the Eastern Shore?

410 covers the Eastern Shore (Salisbury, Ocean City, Easton, Cambridge, Chestertown). 443 and 667 are the overlays. Same coverage as Baltimore.

Can I get a Maryland number if I don't live in MD?

Yes. CallMama doesn't require a Maryland billing address or proof of in-state residency. Pick any of the 6 MD area codes from anywhere in the world.

Will my outbound calls show a Maryland prefix?

Yes. Every outbound call displays your chosen Maryland area code on the recipient's caller ID — Baltimoreans, DC commuters and Eastern Shore locals all see a familiar prefix.

Can I port my existing Maryland number to CallMama?

Yes. Any MD number from Verizon, AT&T, T-Mobile, Comcast/Xfinity or any other US carrier can be ported in. Porting typically completes in 3–7 business days.

Maryland Area Codes – 240, 301, 410 & 443 City Zone Guide

01 — MARYLAND AT A GLANCE

Maryland, by the numbers.

Maryland was assigned a single area code in 1947: 301, covering the entire state. For 44 years that single code carried Baltimore, the DC suburbs, the Eastern Shore and western MD.

410 split from 301 in 1991 for Baltimore and the Eastern Shore (Annapolis, Salisbury, Ocean City), leaving 301 with the DC suburbs (Bethesda, Rockville, Silver Spring, Frederick) and western MD (Hagerstown, Cumberland).

Overlays followed as Baltimore and the DC metro grew: 443 (over 410, 1997), 240 (over 301, 2001), 667 (over 410, 2012), and 227 (over 301/240, 2023). Both Baltimore and the DC suburbs now run three overlapping codes each.

DID YOU KNOW?

Maryland's 301 was once the only area code for the entire state, and is the only original 1947 code in the US to be split, then re-overlaid by THREE additional codes (240, 227, plus the inevitable future ones). Together 301/240/227 carry the DC suburbs — one of the densest federal-employee zones in the country.

02 — REGIONAL MAP

Maryland area code region map.

Every Maryland area code plotted at its primary city. Click any marker for that code's details. Overlays share geography with their parent code — they're shown offset on the map for visibility.

301Bethesda·240Bethesda·227Bethesda·410Baltimore·443Baltimore·667Baltimore

THE ICONIC CODE

410

Why 410 matters in Maryland

410 is Baltimore's signature — split from 301 in 1991 to carve off the city, Annapolis, and the Eastern Shore. Orioles and Ravens offices, Johns Hopkins, the Inner Harbor business district and the Baltimore-area DOJ/FBI operations all use 410. The 443 and 667 overlays cover the same geography but never match the original.

Get a 410 number

WHO USES MARYLAND NUMBERS

Maryland's economy in four sectors.

Federal GovernmentNIH (301 Bethesda), NSA (410 Fort Meade), NASA Goddard (301 Greenbelt)
Biotech & DefenseLockheed Martin Bethesda (301), Northrop Grumman, Emergent BioSolutions
Higher Education & HealthJohns Hopkins (410), University of Maryland (301), Walter Reed
Port & LogisticsPort of Baltimore (410) — major East Coast container hub

03 — AREA CODES

All Maryland area codes. One state.

Every Maryland metro covered by a different prefix. Open any card to view its full detail page.

301Original

Bethesda

DC suburbs + western MD · 35 cities

Since 1947Get this code

240Overlay

Bethesda

Overlay of 301 · 35 cities

Since 2001Get this code

227Overlay

Bethesda

Overlay of 301/240 · 35 cities

Since 2023Get this code

410Split

Baltimore

Baltimore + Eastern Shore · 40 cities

Since 1991Get this code

443Overlay

Baltimore

Overlay of 410 · 40 cities

Since 1997Get this code

667Overlay

Baltimore

Overlay of 410/443 · 40 cities

Since 2012Get this code

04 — CITIES

275+ Maryland cities, one searchable list.

Find your city, find its area code, then activate a number with that prefix.

Baltimore410

Frederick301

Rockville301

Gaithersburg301

Bowie301

Hagerstown301

Annapolis410

Columbia410

Silver Spring301

Bethesda301

Salisbury410

Towson410

Dundalk410

Catonsville410

Glen Burnie410

Wheaton301

Ellicott City410

Germantown301

Aspen Hill301

Pikesville410

Severn410

North Bethesda301

Olney301

Potomac301

Bel Air410

Westminster410

Cumberland301

Hyattsville301

Greenbelt301

Laurel301

Easton410

Ocean City410

05 — WHY MARYLAND

Six reasons to pick a Maryland number.

A local Maryland prefix outperforms an out-of-state cell at every customer touchpoint.

A 410 reads Baltimore native

Restricted to Baltimore, Annapolis and the Eastern Shore since 1991, 410 carries serious Charm City credibility — distinct from the 443 and 667 overlays.

301 signals DC suburbs / federal contracts

Bethesda, Rockville, Silver Spring — Maryland's DC commuter belt is heavy with federal contractors, lobbyists and NIH/NSA professionals. A 301 prefix marks you as inside that ecosystem.

Eastern Time alignment with DC + NYC corridor

Maryland sits between two major East Coast metros. An MD prefix tells federal and NYC clients you're on their schedule.

Cover Baltimore + DC suburbs from one app

Selling across both Maryland metros? Add 410 Baltimore and 301 DC-suburbs lines on one account — switch per call across the I-95 corridor.

STIR/SHAKEN-clean caller ID

NANPA-routed Maryland numbers pass carrier authentication, so cold-call recipients see your local prefix instead of a flagged "Spam Likely" tag.

Held free if you pause

Cancel service and your Maryland number is reserved free for 12 months — keep your 410 or 301 across federal contract cycles and moves.

Ready to sound local in Maryland?Pick your Maryland area code and start receiving calls today.

Get a Maryland number

06 — REACH

6.2M Marylanders across every area code.

Each Maryland area code covers a distinct region. Here's how the population breaks down.

POPULATION BY AREA CODE

301

2.0M

410

2.5M

443

1.8M

240

1.5M

Population Overlay · shares parent geography

Source: US Census Bureau / ACS estimates.

$510BState GDP

2.8MBaltimore metro population

$98KMedian household income

3hDrive end-to-end across Maryland

08 — EVERY US AREA CODE

Browse every US area code.

Search by state, city, or number — then click any code to open its detail page. Maryland is in here too.

List of USA States and Their Area Codes

State	Area Codes	Time Zone	Count
Alabama	205251256334659938	CT	6
Alaska	907	AKT	1
Arizona	480520602623928	MST	5
Arkansas	479501870	CT	3
California	213310408415510619650714818916	PT	10
Colorado	303719720970	MT	4
Connecticut	203475860959	ET	4
Delaware	302	ET	1
District of Columbia	202	ET	1
Florida	239305321407561727786813850904954	ET^*	11
Georgia	229404470478678706762770912	ET	9
Hawaii	808	HST	1
Idaho	208986	MT^*	2
Illinois	217224309312331618630708773779815847872	CT	13
Indiana	219260317463574765812930	ET^*	8
Iowa	319515563641712	CT	5
Kansas	316620785913	CT^*	4
Kentucky	270364502606859	ET^*	5
Louisiana	225318337504985	CT	5
Maine	207	ET	1
Maryland	240301410443667	ET	5
Massachusetts	339351413508617774781857978	ET	9
Michigan	231248269313517586616734810906947989	ET^*	12
Minnesota	218320507612651763952	CT	7
Mississippi	228601662769	CT	4
Missouri	314417573636660816	CT	6
Montana	406	MT	1
Nebraska	308402531	CT^*	3
Nevada	702725775	PT	3
New Hampshire	603	ET	1
New Jersey	201551609732848856862908973	ET	9
New Mexico	505575	MT	2
New York	212315332347516518585607631646680716718838845914917929934	ET	19
North Carolina	252336704743828910919980984	ET	9
North Dakota	701	CT^*	1
Ohio	216234330380419440513567614740937	ET	11
Oklahoma	405539580918	CT	4
Oregon	458503541971	PT^*	4
Pennsylvania	215267272412445484570610717724814878	ET	12
Rhode Island	401	ET	1
South Carolina	803843854864	ET	4
South Dakota	605	CT^*	1
Tennessee	423615629731865901931	CT^*	7
Texas	210214254281325346361409430432469512682713737806817830832903	CT^*	20
Utah	385435801	MT	3
Vermont	802	ET	1
Virginia	276434540571703757804	ET	7
Washington	206253360425509564	PT	6
West Virginia	304681	ET	2
Wisconsin	262414534608715920	CT	6
Wyoming	307	MT	1
Puerto Rico	787939	AST	2

Showing all 52 states & territories^* State spans multiple time zones — code-level zone may differ.

Maryland area codes the complete map & list.

Maryland, by the numbers.

Maryland area code region map.

Why 410 matters in Maryland

Maryland's economy in four sectors.

All Maryland area codes. One state.

Bethesda

Bethesda

Bethesda

Baltimore

Baltimore

Baltimore

275+ Maryland cities, one searchable list.

Six reasons to pick a Maryland number.

A 410 reads Baltimore native

301 signals DC suburbs / federal contracts

Eastern Time alignment with DC + NYC corridor

Cover Baltimore + DC suburbs from one app

STIR/SHAKEN-clean caller ID

Held free if you pause

6.2M Marylanders across every area code.

Three taps to a Maryland number.

Pick your digits

Install the app

Start dialing

Browse every US area code.

List of USA States and Their Area Codes

Frequently asked questions about Maryland area codes.

Pick up where you
left off.

Products

Features

Explore

Company

Legal

Tweaks

Maryland area codes the complete map & list.

Maryland, by the numbers.

Maryland area code region map.

Why 410 matters in Maryland

Maryland's economy in four sectors.

All Maryland area codes. One state.

Bethesda

Bethesda

Bethesda

Baltimore

Baltimore

Baltimore

275+ Maryland cities, one searchable list.

Six reasons to pick a Maryland number.

A 410 reads Baltimore native

301 signals DC suburbs / federal contracts

Eastern Time alignment with DC + NYC corridor

Cover Baltimore + DC suburbs from one app

STIR/SHAKEN-clean caller ID

Held free if you pause

6.2M Marylanders across every area code.

Three taps to a Maryland number.

Pick your digits

Install the app

Start dialing

Browse every US area code.

List of USA States and Their Area Codes

Frequently asked questions about Maryland area codes.

Pick up where youleft off.

Products

Features

Explore

Company

Legal

Tweaks

Pick up where you
left off.