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Area Code 240
Maryland area code 240 has been in service since 1997. It has 250 landlines and 125 wireless prefixes (exchanges) serviced by 40 carriers. It covers 11 counties, 501 ZIP codes, and 56 cities, including Gaithersburg, Laurel, Hyattsville, Rockville, Silver Spring, Germantown, Waldorf, Montgomery Village, and Bowie.
- State:
- Maryland
- Time Zone:
- Eastern (12:35 am)
Area Code (240) has 375 prefixes
| Prefix | County | City | Company/Carrier | Line Type |
|---|---|---|---|---|
| (240) 205- | Montgomery | Rockville | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 206- | Prince Georges | Bowie | Xo Maryland, Llc | Landline |
| (240) 207- | Montgomery | Damascus | Cavalier East Llc - Md | Landline |
| (240) 209- | Howard | Columbia | Global Naps South, Inc. - Md | Landline |
| (240) 210- | Charles | Waldorf | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 214- | Adams | Gettysburg | Global Naps South, Inc. - Md | Landline |
| (240) 215- | Frederick | Frederick | Telcove Operations, Inc. - Md | Landline |
| (240) 216- | Charles | Waldorf | Nextel Communications, Inc. | Cell Phone |
| (240) 217- | Washington | Hagerstown | Omnipoint Communications Ca... | Cell Phone |
| (240) 221- | Montgomery | Rockville | Verizon Maryland, Inc. | Landline |
| (240) 222- | Charles | Waldorf | Cavalier Telephone Mid-atla... | Landline |
| (240) 223- | Montgomery | Bethesda | Allegiance Telecom, Inc. - Md | Landline |
| (240) 228- | Howard | Laurel | Verizon Maryland, Inc. | Landline |
| (240) 229- | Charles | Waldorf | Broadwing Communications. L... | Landline |
| (240) 230- | Charles | La Plata | Global Crossing Local Servi... | Landline |
| (240) 232- | Prince Georges | Bowie | Broadwing Communications. L... | Landline |
| (240) 233- | Charles | Newburg | Teleport Communications Gro... | Landline |
| (240) 235- | Montgomery | Chevy Chase | Paetec Communications, Inc.... | Landline |
| (240) 236- | Frederick | Frederick | Verizon Maryland, Inc. | Landline |
| (240) 237- | Saint Marys | Lexington Park | Teleport Communications Gro... | Landline |
| (240) 238- | Montgomery | Rockville | Paetec Communications, Inc.... | Landline |
| (240) 241- | Prince Georges | Beltsville | Starpower Communications, L... | Landline |
| (240) 242- | Montgomery | Silver Spring | Starpower Communications, L... | Landline |
| (240) 243- | Montgomery | Gaithersburg | Allegiance Telecom, Inc. - Md | Landline |
| (240) 244- | Prince Georges | Clinton | Starpower Communications, L... | Landline |
| (240) 245- | Prince Georges | Bowie | Starpower Communications, L... | Landline |
| (240) 246- | Montgomery | Gaithersburg | Starpower Communications, L... | Landline |
| (240) 247- | Montgomery | Silver Spring | Allegiance Telecom, Inc. - Md | Landline |
| (240) 248- | District Of Columbia | Washington | Global Naps South, Inc. - Md | Landline |
| (240) 249- | Saint Marys | Mechanicsville | Teleport Communications Gro... | Landline |
| (240) 250- | Montgomery | Gaithersburg | Global Naps South, Inc. - Md | Landline |
| (240) 252- | Montgomery | Germantown | Level 3 Communications, Llc... | Landline |
| (240) 253- | Prince Georges | Oxon Hill | Global Crossing Local Servi... | Landline |
| (240) 254- | Charles | Hughesville | Teleport Communications Gro... | Landline |
| (240) 256- | Fairfax | Fairfax | Teleport Communications Gro... | Landline |
| (240) 258- | Saint Marys | Saint Inigoes | Teleport Communications Gro... | Landline |
| (240) 260- | Prince Georges | Hyattsville | Allegiance Telecom, Inc. - Md | Landline |
| (240) 263- | Prince Georges | Upper Marlboro | Tidalwave Telephone Inc. | Landline |
| (240) 264- | Prince Georges | Laurel | Verizon Maryland, Inc. | Landline |
| (240) 265- | Prince Georges | Laurel | Tidalwave Telephone Inc. | Landline |
| (240) 268- | Montgomery | Rockville | Allegiance Telecom, Inc. - Md | Landline |
| (240) 271- | Montgomery | Silver Spring | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 273- | Prince Georges | Fort Washington | Broadwing Communications. L... | Landline |
| (240) 274- | Prince Georges | Oxon Hill | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 276- | Montgomery | Rockville | Verizon Maryland, Inc. | Landline |
| (240) 277- | Montgomery | Silver Spring | Sprint Spectrum L.p. | Cell Phone |
| (240) 280- | Prince Georges | Laurel | Comcast Phone Of Northern M... | Landline |
| (240) 281- | Prince Georges | Hyattsville | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 282- | Frederick | Middletown | Global Naps South, Inc. - Md | Landline |
| (240) 283- | Montgomery | Rockville | Paetec Communications, Inc.... | Landline |
| (240) 284- | Allegany | Frostburg | Nationsline, Inc. - Md | Landline |
| (240) 285- | Frederick | Frederick | Cellco Partnership Dba Veri... | Cell Phone |
| (240) 286- | District Of Columbia | Washington | Nextel Communications, Inc. | Cell Phone |
| (240) 288- | Frederick | Thurmont | Nationsline, Inc. - Md | Landline |
| (240) 289- | Prince Georges | Oxon Hill | Cavalier Telephone Mid-atla... | Landline |
| (240) 290- | Montgomery | Rockville | Allegiance Telecom, Inc. - Md | Landline |
| (240) 291- | Washington | Hagerstown | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 292- | Montgomery | Silver Spring | Verizon Maryland, Inc. | Landline |
| (240) 293- | Montgomery | Silver Spring | Starpower Communications, L... | Landline |
| (240) 294- | Prince Georges | Laurel | Xo Maryland, Llc | Landline |
| (240) 295- | Prince Georges | Laurel | Cavalier Telephone Mid-atla... | Landline |
| (240) 296- | Prince Georges | Hyattsville | Cavalier Telephone Mid-atla... | Landline |
| (240) 297- | Prince Georges | Greenbelt | Level 3 Communications, Llc... | Landline |
| (240) 298- | Saint Marys | Hollywood | Cellco Partnership Dba Veri... | Cell Phone |
| (240) 299- | Charles | Waldorf | Nextel Communications, Inc. | Cell Phone |
| (240) 303- | Prince Georges | Clinton | Cavalier Telephone Mid-atla... | Landline |
| (240) 304- | Prince Georges | District Heights | Nextel Communications, Inc. | Cell Phone |
| (240) 305- | Montgomery | Silver Spring | Sprint Spectrum L.p. | Cell Phone |
| (240) 306- | Montgomery | Rockville | Allegiance Telecom, Inc. - Md | Landline |
| (240) 307- | Frederick | Emmitsburg | At&t Local | Landline |
| (240) 308- | District Of Columbia | Washington | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 310- | Washington | Hagerstown | Uscoc Of Cumberland, Inc. D... | Landline |
| (240) 312- | Prince Georges | Capitol Heights | Cavalier Telephone Mid-atla... | Landline |
| (240) 313- | Washington | Hagerstown | Verizon Maryland, Inc. | Landline |
| (240) 314- | Montgomery | Rockville | Verizon Maryland, Inc. | Landline |
| (240) 315- | Frederick | Frederick | Verizon Maryland, Inc. | Landline |
| (240) 317- | Saint Marys | Lexington Park | Starpower Communications, L... | Landline |
| (240) 318- | Prince Georges | Clinton | Verizon Maryland, Inc. | Landline |
| (240) 320- | District Of Columbia | Washington | Cavalier East Llc - Md | Landline |
| (240) 321- | Garrett | Swanton | Uscoc Of Cumberland, Inc. D... | Landline |
| (240) 326- | Prince Georges | Upper Marlboro | Cavalier Telephone Mid-atla... | Landline |
| (240) 328- | Montgomery | Rockville | Verizon Maryland, Inc. | Landline |
| (240) 329- | Washington | Hagerstown | Level 3 Communications, Llc... | Landline |
| (240) 330- | Montgomery | Germantown | Sprint Spectrum L.p. | Cell Phone |
| (240) 332- | Montgomery | Silver Spring | Global Naps South, Inc. - Md | Landline |
| (240) 333- | Montgomery | Bethesda | Cavalier East Llc - Md | Landline |
| (240) 334- | Prince Georges | Bowie | Global Crossing Local Servi... | Landline |
| (240) 335- | Prince Georges | Lanham | Cavalier Telephone Mid-atla... | Landline |
| (240) 337- | Orange | Newport Beach | Global Naps South, Inc. - Md | Landline |
| (240) 338- | Prince Georges | Bowie | Cellco Partnership Dba Veri... | Cell Phone |
| (240) 339- | Prince Georges | Upper Marlboro | Cavalier East Llc - Md | Landline |
| (240) 342- | Montgomery | Olney | Starpower Communications, L... | Landline |
| (240) 344- | Frederick | Frederick | New Cingular Wireless Pcs,... | Cell Phone |
| (240) 345- | Howard | Highland | Level 3 Communications, Llc... | Landline |
| (240) 346- | Charles | Waldorf | Sprint Spectrum L.p. | Cell Phone |
| (240) 348- | Prince Georges | Clinton | Level 3 Communications, Llc... | Landline |
| (240) 349- | Charles | La Plata | Global Crossing Local Servi... | Landline |
| (240) 350- | Prince Georges | Bowie | Sprint Spectrum L.p. | Cell Phone |
| (240) 351- | Montgomery | Silver Spring | Sprint Spectrum L.p. | Cell Phone |
| (240) 353- | Montgomery | Silver Spring | Sprint Spectrum L.p. | Cell Phone |
