What does an area code page show?

It shows the broader region, available prefixes, and carrier or city clues linked to that area code.

How does an area code help reverse phone lookup?

It provides a geographic starting point before you investigate a specific full number.

Home / Area Codes / 240

Area Code Directory

Area Code 240

Browse available prefixes, locations, carriers, and quick path links into deeper phone number pages for this area code. Area-code research is one of the most important parts of reverse phone lookup because it gives visitors a geographic starting point before they inspect a full number.

Back to Area Codes Recent Reports

200Prefixes Listed

MarylandLocation

United StatesCountry

240Area Code

Area Code Overview

Area Code240

Primary LocationMaryland

CountryUnited States

Prefix Coverage200 listed prefixes

Prefixes in 240

240-200

Washington

Bandwidth.com Clec Llc - Md

Landline

240-201

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-203

Hagerstown

Sprint Spectrum L.p. - Md

Wireless

240-204

Annapolis Junction

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-205

Annapolis Junction

New Cingular Wireless Pcs Llc - Dc

Cavalier East Llc - Md

Landline

240-208

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-209

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-210

Beltsville

New Cingular Wireless Pcs Llc - Dc

Wireless

240-212

Frederick

Core Communications Inc. - Md

Landline

240-213

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-214

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-215

Ijamsville

Telcove Operations Inc. - Md

Omnipoint Communications Cap Operations Llc

Wireless

240-218

Washington

Peerless Network Of Illinois Llc - Il

Landline

240-219

Reston

Global Naps South Inc. - Md

Landline

240-220

Reston

Global Naps South Inc. - Md

Landline

240-221

Rockville

Verizon Maryland Inc.

Landline

240-222

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-223

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-224

Annapolis Junction

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-225

Frederick

Core Communications Inc. - Md

Landline

240-228

Laurel

Verizon Maryland Inc.

Landline

240-229

Washington

Broadwing Communications. Llc - Md

Landline

240-230

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-231

Frederick

Core Communications Inc. - Md

Landline

240-232

Washington

Broadwing Communications. Llc - Md

Landline

240-233

Washington

Teleport Communications America Llc - Dc

Landline

240-234

Beltsville

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-235

Chevy Chase

Paetec Communications Inc. - Md

Landline

240-236

Frederick

Verizon Maryland Inc.

Landline

240-237

Washington

Teleport Communications America Llc - Dc

Landline

240-238

Chevy Chase

Paetec Communications Inc. - Md

Landline

240-239

Chevy Chase

Core Communications Inc. - Md

Landline

240-241

Lanham

Starpower Communications Llc - Md

Landline

240-242

Lanham

Starpower Communications Llc - Md

Landline

240-243

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-244

Washington

Starpower Communications Llc - Md

Landline

240-245

Lanham

Starpower Communications Llc - Md

Landline

240-246

Lanham

Starpower Communications Llc - Md

Landline

240-247

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-248

Reston

Global Naps South Inc. - Md

Landline

240-249

Washington

Teleport Communications America Llc - Dc

Landline

240-250

Reston

Global Naps South Inc. - Md

Landline

240-251

Frederick

Core Communications Inc. - Md

Landline

240-252

McLean

Level 3 Communications Llc - Md

Landline

240-253

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-254

Washington

Teleport Communications America Llc - Dc

Landline

240-255

Reston

Global Naps South Inc. - Md

Landline

240-256

Washington

Teleport Communications America Llc - Dc

Landline

240-257

Washington

Teleport Communications America Llc - Dc

Landline

240-258

McLean

Teleport Communications America Llc - Dc

Landline

240-260

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-261

Reston

Global Naps South Inc. - Md

Verizon Maryland Inc.

Global Naps South Inc. - Md

Landline

240-268

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-269

Reston

Global Naps South Inc. - Md

Landline

240-270

Washington

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-271

Beltsville

New Cingular Wireless Pcs Llc - Dc

Broadwing Communications. Llc - Md

Landline

240-274

Beltsville

New Cingular Wireless Pcs Llc - Dc

Wireless

240-275

Frederick

Core Communications Inc. - Md

Landline

240-276

Gaithersburg

Verizon Maryland Inc.

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-279

Chevy Chase

Core Communications Inc. - Md

Landline

240-280

Sterling

Comcast Phone Of Northern Maryland Inc. - Md

Landline

240-281

Beltsville

New Cingular Wireless Pcs Llc - Dc

Wireless

240-282

Reston

Global Naps South Inc. - Md

Landline

240-283

Chevy Chase

Paetec Communications Inc. - Md

Landline

240-284

Hagerstown

Level 3 Communications Llc - Md

Landline

240-285

Frederick

Cellco Partnership Dba Verizon Wireless - Md

Core Communications Inc. - Md

Landline

240-288

Frederick

Comcast Phone Of Northern Maryland Inc. - Md

Landline

240-289

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-290

Unknown City

Allegiance Telecom Inc. - Md

Landline

240-291

Monrovia

New Cingular Wireless Pcs Llc - Dc

Wireless

240-292

McLean

Verizon Maryland Inc.

Landline

240-293

McLean

Starpower Communications Llc - Md

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-296

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-297

McLean

Level 3 Communications Llc - Md

Landline

240-298

Washington

Cellco Partnership Dba Verizon Wireless - Md

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-303

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-304

Silver Spring

Sprint Spectrum L.p. - Md

Allegiance Telecom Inc. - Md

New Cingular Wireless Pcs Llc - Dc

Wireless

240-309

Washington

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-310

Frederick

Uscoc Of Cumberland Inc. Dba United States Cel Md

Landline

240-312

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-313

Hagerstown

Verizon Maryland Inc.

Landline

240-314

Rockville

Verizon Maryland Inc.

Landline

240-315

Frederick

Verizon Maryland Inc.

Starpower Communications Llc - Md

Landline

240-318

Clinton

Verizon Maryland Inc.

Landline

240-319

Baltimore

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-320

Washington

Cavalier East Llc - Md

Landline

240-321

Cumberland

Uscoc Of Cumberland Inc. Dba United States Cel Md

Landline

240-322

Frederick

Core Communications Inc. - Md

Landline

240-323

Frederick

Core Communications Inc. - Md

Landline

240-324

Baltimore

Ymax Communications Corp. - Md

Landline

240-325

Chevy Chase

Core Communications Inc. - Md

Landline

240-326

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-327

Chevy Chase

Core Communications Inc. - Md

Landline

240-328

Beltsville

Verizon Maryland Inc.

Landline

240-329

Frederick

Level 3 Communications Llc - Md

Global Naps South Inc. - Md

Landline

240-332

Reston

Global Naps South Inc. - Md

Landline

240-333

Washington

Cavalier East Llc - Md

Landline

240-334

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-335

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-336

Chevy Chase

Core Communications Inc. - Md

Landline

240-337

Reston

Global Naps South Inc. - Md

Landline

240-338

Annapolis Junction

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-339

Washington

Cavalier East Llc - Md

Mci Worldcom Communications Inc. - Md

Landline

240-342

Lanham

Starpower Communications Llc - Md

Landline

240-343

Hagerstown

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-344

Monrovia

New Cingular Wireless Pcs Llc - Dc

Wireless

240-345

Baltimore

Level 3 Communications Llc - Md

Bandwidth.com Clec Llc - Md

Landline

240-348

McLean

Level 3 Communications Llc - Md

Landline

240-349

Unknown City

Global Crossing Local Services Inc.-md

Global Naps South Inc. - Md

Level 3 Communications Llc - Md

Landline

240-357

Frederick

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-358

Reston

Global Naps South Inc. - Md

Landline

240-359

Reston

Global Naps South Inc. - Md

Landline

240-361

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-362

Cumberland

Verizon Maryland Inc.

Landline

240-363

Reston

Global Naps South Inc. - Md

Landline

240-364

Washington

Cavalier East Llc - Md

Landline

240-365

Chevy Chase

Baltimore-washington Telephone Bwt

Global Naps South Inc. - Md

Landline

240-369

Mount Airy

Core Communications Inc. - Md

Global Naps South Inc. - Md

Verizon Maryland Inc.

Landline

240-374

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-375

Silver Spring

Sprint Spectrum L.p. - Md

Wireless

240-376

Reston

Global Naps South Inc. - Md

Landline

240-377

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-378

Frederick

Core Communications Inc. - Md

Landline

240-379

Frederick

Verizon Maryland Inc.

Landline

240-380

Beltsville

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-381

Beltsville

New Cingular Wireless Pcs Llc - Dc

Wireless

240-382

Hagerstown

Teleport Communications America Llc - Md

Landline

240-383

Beltsville

New Cingular Wireless Pcs Llc - Dc

Wireless

240-384

Reston

Global Naps South Inc. - Md

Landline

240-385

Frederick

Verizon Maryland Inc.

Landline

240-386

Gaithersburg

Verizon Maryland Inc.

Landline

240-387

Washington

Cavalier East Llc - Md

Landline

240-388

Silver Spring

Sprint Spectrum L.p. - Md

Wireless

240-389

Washington

Atx Telecommunications Services Ltd

Landline

240-390

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-391

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-392

Lanham

Starpower Communications Llc - Md

Landline

240-393

Annapolis Junction

Cellco Partnership Dba Verizon Wireless - Md

Wireless

240-394

Hagerstown

New Cingular Wireless Pcs Llc - Dc

Wireless

240-395

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Landline

240-396

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-397

Frederick

Cellco Partnership Dba Verizon Wireless - Md

New Cingular Wireless Pcs Llc - Dc

Wireless

240-402

Reston

Mci Worldcom Communications Inc. - Md

Landline

240-403

Herndon

Cavalier Telephone Mid-atlantic Llc - Md

Us Lec Of Maryland Inc.

Landline

240-406

Washington

Leap Wireless Intl Inc. Dba Cricket Comm Inc.

Wireless

240-407

Unknown City

Global Crossing Local Services Inc.-md

Landline

240-408

Beltsville

Leap Wireless Intl Inc. Dba Cricket Comm Inc.

Wireless

240-409

Monrovia

New Cingular Wireless Pcs Llc - Dc

Top prefixes in this area code

240-200→240-201→240-203→240-204→240-205→240-206→240-207→240-208→

Why area code pages matter in reverse phone lookup

Area code pages help visitors understand the wider calling region connected to a number. While a full reverse phone lookup page focuses on one specific caller, an area code page shows the bigger picture by grouping prefixes, cities, and carrier patterns under the same first three digits. This makes it easier to spot whether a number appears local, regional, or part of a service area the visitor already recognizes.

For phone directory websites, area code pages also improve browsing. A user can start with a missed call, discover the number's first three digits, and then move into the related area code to see supporting location data and a list of active prefixes. That layered navigation creates a better research experience and gives visitors more confidence when they continue into a specific number page.