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Area Code 240

Area code 240 is in Maryland, USA , spanning 11 counties and serving 180 cities, including Germantown, Rockville or Gaithersburg; it currently uses 785 prefixes, assigned from 240-200-XXXX through 240-998-XXXX.

In service since June 01, 1997, area code 240 is an overlay Numbering Plan Area, part of overlay complex 301/240/227.

The current local time is .

240 area code location on a map
© OpenStreetMap contributors
For exact NPA boundaries see official 240 area code map

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Locate any 240-NXX prefix:

NPANXX Area Served1 Date2
240-200 Washington Zone 2 10/4/2010
240-201 Ridge N/A
240-202 Highfield 5/28/2020
240-203 Hagerstown 10/4/2011
240-204 Washington Zone 2 9/7/2011
240-205 Washington Zone 10 7/23/2003
240-206 Washington Zone 14 N/A
240-207 Damascus N/A
240-208 La Plata N/A
240-209 Indian Head N/A
240-210 Waldorf N/A
240-212 Oakland N/A
240-213 Waldorf N/A
240-214 Mechanicsville N/A
240-215 Frederick N/A
240-216 Waldorf 3/15/2001
240-217 Hagerstown 4/16/2001
240-218 Nanjemoy N/A
240-219 Ridge 9/22/2014
240-220 Poolesville N/A
240-221 Washington Zone 11 N/A
240-222 Waldorf N/A
240-223 Washington Zone 2 N/A
240-224 Gaithersburg 9/10/2012
240-225 Frederick N/A
240-226 Oakland 7/16/2020
240-227 Myersville 07/25/2023
240-228 Washington Zone 13 N/A
240-229 Waldorf N/A
240-230 Hughesville N/A
240-231 Hagerstown N/A
240-232 Washington Zone 14 N/A
240-233 Tompkinsville N/A
240-234 Washington Zone 2 10/4/2011
240-235 Washington Zone 2 N/A
240-236 Frederick N/A
240-237 Lexington Park-Great Mills N/A
240-238 Washington Zone 10 N/A
240-239 Leonardtown N/A
240-240 Damascus 7/2/2020
240-241 Washington Zone 13 N/A
240-242 Washington Zone 11 N/A
240-243 Gaithersburg N/A
240-244 Washington Zone 16 N/A
240-245 Washington Zone 14 N/A
240-246 Gaithersburg N/A
240-247 Washington Zone 3 N/A
240-248 Ridge N/A
240-249 Mechanicsville N/A
240-250 Brandywine N/A
240-251 Highfield N/A
240-252 Gaithersburg N/A
240-253 Washington Zone 6 N/A
240-254 Hughesville N/A
240-255 Poolesville N/A
240-256 Leonardtown N/A
240-257 Nanjemoy N/A
240-258 Ridge N/A
240-259 Hughesville 4/22/2021
240-260 Washington Zone 14 N/A
240-261 Gaithersburg 12/23/2015
240-262 Lexington Park-Great Mills 10/17/2011
240-263 Washington Zone 2 11/10/2011
240-264 Laurel N/A
240-265 Washington Zone 2 11/10/2011
240-266 Washington Zone 14 N/A
240-267 Hagerstown 5/18/2017
240-268 Washington Zone 10 N/A
240-269 Washington Zone 16 N/A
240-270 Waldorf 11/7/2011
240-271 Washington Zone 2 N/A
240-272 Washington Zone 2 11/10/2011
240-273 Washington Zone 6 N/A
240-274 Washington Zone 2 N/A
240-275 Grantsville N/A
240-276 Washington Zone 10 5/4/2004
240-277 Washington Zone 2 10/18/2002
240-278 Laurel 7/8/2011
240-279 Waldorf N/A
240-280 Laurel N/A
240-281 Washington Zone 2 N/A
240-282 Mechanicsville N/A
240-283 Washington Zone 11 N/A
240-284 Frostburg 11/1/2004
240-285 Frederick N/A
240-286 Washington Zone 2 9/17/2002
240-287 Hancock N/A
240-288 Thurmont 11/1/2004
240-289 Washington Zone 6 N/A
240-290 Washington Zone 11 N/A
240-291 Hagerstown 10/15/2002
240-292 Washington Zone 11 N/A
240-293 Washington Zone 12 N/A
240-294 Laurel N/A
240-295 Laurel N/A
240-296 Washington Zone 4 N/A
240-297 Washington Zone 13 N/A
240-298 Leonardtown N/A
240-299 Waldorf N/A
NPANXX Area Served1 Date2
240-300 Waldorf 12/7/2010
240-301 Clear Spg 6/9/2020
240-302 Laurel 9/28/2016
240-303 Washington Zone 16 N/A
240-304 Washington Zone 5 7/3/2002
240-305 Washington Zone 3 N/A
240-306 Gaithersburg N/A
240-307 Emmitsburg 3/27/2003
240-308 Damascus N/A
240-309 Leonardtown 9/10/2012
240-310 Hagerstown N/A
240-312 Washington Zone 5 N/A
240-313 Hagerstown N/A
240-314 Washington Zone 10 N/A
240-315 Frederick N/A
240-316 Washington Zone 2 N/A
240-317 Lexington Park-Great Mills N/A
240-318 Washington Zone 16 N/A
240-319 Laurel 6/6/2008
240-320 Waldorf N/A
240-321 Oakland N/A
240-322 Mccoole N/A
240-323 Emmitsburg N/A
240-324 Ashton 10/8/2008
240-325 Damascus N/A
240-326 Washington Zone 15 N/A
240-327 Gaithersburg N/A
240-328 Washington Zone 10 N/A
240-329 Hagerstown N/A
240-330 Washington Zone 2 12/14/2007
240-331 Washington Zone 3 N/A
240-332 Tompkinsville N/A
240-333 Washington Zone 2 5/9/2001
240-334 Washington Zone 14 N/A
240-335 Washington Zone 14 N/A
240-336 Washington Zone 2 N/A
240-337 Washington Zone 5 N/A
240-338 Washington Zone 3 N/A
240-339 Washington Zone 15 N/A
240-340 Washington Zone 2 8/18/2011
240-341 Buckeyestown 2/25/2009
240-342 Ashton N/A
240-343 Hancock 5/10/2011
240-344 Frederick 10/15/2002
240-345 Ashton 3/9/2006
240-346 Waldorf N/A
240-347 Hagerstown 8/4/2008
240-348 Washington Zone 16 N/A
240-349 La Plata N/A
240-350 Washington Zone 3 N/A
240-351 Washington Zone 3 N/A
240-352 La Plata N/A
240-353 Washington Zone 3 N/A
240-354 Washington Zone 3 N/A
240-355 Washington Zone 3 N/A
240-356 Myersville N/A
240-357 Frederick 6/12/2006
240-358 Damascus N/A
240-359 Indian Head N/A
240-360 Laurel 9/17/2013
240-361 Gaithersburg N/A
240-362 Cumberland N/A
240-363 Washington Zone 11 N/A
240-364 Gaithersburg 5/9/2001
240-365 Damascus N/A
240-366 Williamsport N/A
240-367 Frederick 10/18/2002
240-368 Waldorf N/A
240-369 Mount Airy N/A
240-370 Washington Zone 2 12/14/2007
240-371 Washington Zone 12 N/A
240-372 Gaithersburg N/A
240-373 Washington Zone 13 N/A
240-374 Laurel N/A
240-375 Washington Zone 5 N/A
240-376 Hughesville N/A
240-377 Indian Head N/A
240-378 Cumberland N/A
240-379 Frederick N/A
240-380 Washington Zone 2 9/17/2007
240-381 Washington Zone 3 N/A
240-382 Hagerstown 6/11/2009
240-383 Washington Zone 2 N/A
240-384 Lexington Park-Great Mills N/A
240-385 Myersville N/A
240-386 Washington Zone 10 N/A
240-387 Washington Zone 13 N/A
240-388 Gaithersburg 11/4/2002
240-389 Ashton N/A
240-390 Ashton N/A
240-391 Washington Zone 13 N/A
240-392 Washington Zone 5 N/A
240-393 Washington Zone 3 N/A
240-394 Mount Airy 12/13/2004
240-395 Washington Zone 2 N/A
240-396 Washington Zone 2 N/A
240-397 Frederick 3/6/2009
240-398 Washington Zone 3 7/3/2002
240-399 Washington Zone 10 N/A
NPANXX Area Served1 Date2
240-400 Washington Zone 2 8/18/2011
240-401 Washington Zone 10 N/A
240-402 Washington Zone 13 9/21/2010
240-403 Washington Zone 10 N/A
240-404 Gaithersburg 2/13/2001
240-405 Frederick 7/27/2004
240-406 Washington Zone 10 9/17/2009
240-407 Washington Zone 16 N/A
240-408 Washington Zone 10 10/14/2009
240-409 Frederick N/A
240-410 Cumberland 1/13/2021
240-412 Waldorf 1/16/2001
240-413 Washington Zone 4 3/12/2001
240-414 Washington Zone 6 N/A
240-415 Frederick 12/16/2008
240-416 Waldorf 5/18/2001
240-417 Washington Zone 5 N/A
240-418 Washington Zone 2 11/12/2001
240-419 Waldorf 10/29/2007
240-420 Hagerstown N/A
240-421 Washington Zone 10 4/9/2001
240-422 Frederick 5/15/2002
240-423 Washington Zone 3 5/21/2001
240-424 Washington Zone 3 11/16/2007
240-425 Washington Zone 2 N/A
240-426 Washington Zone 2 10/25/2001
240-427 Waldorf 4/23/2001
240-428 Washington Zone 10 N/A
240-429 Washington Zone 3 12/19/2006
240-430 Washington Zone 11 N/A
240-431 Lexington Park-Great Mills N/A
240-432 Washington Zone 3 N/A
240-433 Washington Zone 12 N/A
240-434 Leonardtown N/A
240-435 Waldorf 5/7/2009
240-436 Buckeyestown N/A
240-437 Ashton N/A
240-438 Washington Zone 3 8/15/2011
240-439 Frederick 6/6/2008
240-440 Frederick 2/27/2009
240-441 Washington Zone 6 6/6/2001
240-442 Oakland 5/22/2001
240-443 Washington Zone 6 11/6/2020
240-444 Laurel 9/7/2011
240-445 Washington Zone 2 11/10/2011
240-446 Frederick 8/9/2001
240-447 Washington Zone 10 N/A
240-448 Waldorf 9/7/2011
240-449 Gaithersburg N/A
240-450 Washington Zone 3 N/A
240-451 Thurmont 9/2/2016
240-452 Hagerstown 7/22/2010
240-453 Washington Zone 10 N/A
240-454 Gaithersburg 4/22/2005
240-455 Washington Zone 5 6/20/2001
240-456 Laurel N/A
240-457 Frederick 9/4/2008
240-458 Waldorf 10/4/2011
240-459 Laurel 7/27/2010
240-460 Washington Zone 3 N/A
240-461 Washington Zone 3 N/A
240-462 Washington Zone 3 N/A
240-463 Washington Zone 3 N/A
240-464 Washington Zone 2 N/A
240-465 Washington Zone 2 N/A
240-466 Mechanicsville 7/10/2001
240-467 Washington Zone 4 4/25/2013
240-468 Washington Zone 3 11/16/2007
240-469 Hagerstown 2/14/2008
240-470 Laurel 10/4/2011
240-471 Washington Zone 12 N/A
240-472 Washington Zone 3 N/A
240-473 Washington Zone 13 N/A
240-474 Gaithersburg 5/22/2015
240-475 Washington Zone 3 N/A
240-476 Washington Zone 3 2/21/2001
240-477 Gaithersburg 5/20/2005
240-478 Washington Zone 3 7/27/2004
240-479 Washington Zone 2 4/7/2008
240-480 Washington Zone 2 9/27/2010
240-481 Washington Zone 3 5/11/2001
240-482 Washington Zone 2 N/A
240-483 Washington Zone 2 N/A
240-484 Laurel 6/12/2017
240-485 Washington Zone 3 N/A
240-486 Washington Zone 14 3/12/2001
240-487 Washington Zone 4 N/A
240-488 Oakland 5/16/2012
240-489 Poolesville 2/13/2001
240-490 Middletown 6/12/2001
240-491 Washington Zone 3 N/A
240-492 Washington Zone 5 N/A
240-493 Washington Zone 6 N/A
240-494 Washington Zone 3 5/9/2001
240-495 Washington Zone 4 10/29/2013
240-496 Leonardtown 3/17/2016
240-497 Washington Zone 2 N/A
240-498 Washington Zone 2 N/A
240-499 Washington Zone 10 N/A
NPANXX Area Served1 Date2
240-500 Hagerstown 10/21/2010
240-501 Washington Zone 3 10/8/2001
240-502 Washington Zone 3 10/4/2011
240-503 Tompkinsville 4/9/2013
240-504 Washington Zone 3 10/4/2011
240-505 Washington Zone 3 10/31/2001
240-506 Washington Zone 10 1/9/2002
240-507 Washington Zone 2 9/5/2008
240-508 Washington Zone 5 N/A
240-509 Washington Zone 14 3/31/2008
240-510 Washington Zone 15 N/A
240-512 Washington Zone 13 8/8/2006
240-513 Hagerstown 10/19/2011
240-514 Washington Zone 11 N/A
240-515 Washington Zone 2 6/20/2001
240-516 Washington Zone 12 N/A
240-517 Laurel 10/28/2014
240-518 Waldorf 10/21/2011
240-519 Washington Zone 2 11/10/2011
240-520 Hagerstown 3/29/2006
240-521 Laurel 1/11/2018
240-522 Cumberland 12/12/2001
240-523 La Plata 2/13/2001
240-524 Laurel N/A
240-525 Washington Zone 15 N/A
240-526 Leonardtown N/A
240-527 Hagerstown N/A
240-528 Hughesville N/A
240-529 Frederick N/A
240-530 Waldorf 8/1/2013
240-531 Washington Zone 3 3/7/2017
240-532 Washington Zone 5 10/29/2013
240-533 Washington Zone 3 N/A
240-534 Washington Zone 2 4/11/2016
240-535 Washington Zone 3 1/9/2001
240-536 Ashton N/A
240-537 Hagerstown 9/15/2017
240-538 Leonardtown 2/13/2001
240-539 Washington Zone 4 N/A
240-540 Washington Zone 13 10/5/2016
240-541 Washington Zone 2 10/31/2011
240-542 Washington Zone 13 N/A
240-543 Washington Zone 2 7/25/2006
240-544 Washington Zone 14 N/A
240-545 Washington Zone 15 N/A
240-546 Washington Zone 16 N/A
240-547 Laurel N/A
240-548 Washington Zone 14 N/A
240-549 Frederick 3/17/2016
240-550 Washington Zone 10 3/26/2009
240-551 Washington Zone 10 3/25/2009
240-552 Washington Zone 10 3/25/2009
240-553 Washington Zone 13 N/A
240-554 Laurel N/A
240-556 Washington Zone 14 N/A
240-557 Washington Zone 6 3/14/2017
240-558 Washington Zone 11 N/A
240-559 Ashton N/A
240-560 Washington Zone 12 4/23/2001
240-561 Leonardtown 7/7/2008
240-562 Gaithersburg 6/12/2015
240-563 Washington Zone 5 7/5/2017
240-564 Laurel 12/21/2018
240-565 Laurel 12/30/2005
240-566 Frederick 6/11/2002
240-567 Washington Zone 10 7/12/2006
240-568 Laurel N/A
240-569 Flintstone 9/22/2017
240-570 Ashton 2/24/2016
240-571 Laurel 1/14/2021
240-572 Leonardtown 11/15/2017
240-573 Washington Zone 15 N/A
240-574 Friendsville 8/27/2020
240-575 Frederick 12/30/2005
240-576 Hagerstown 12/20/2017
240-577 Leonardtown 8/9/2006
240-578 Frederick 7/8/2011
240-579 Ashton 1/11/2018
240-580 Cumberland 6/14/2001
240-581 Laurel N/A
240-582 Washington Zone 4 N/A
240-583 Laurel 4/28/2010
240-584 Laurel 1/11/2018
240-585 Waldorf 6/29/2011
240-586 Frederick 12/22/2006
240-587 Leonardtown 7/6/2009
240-588 Grantsville 2/1/2018
240-589 Mccoole 3/7/2018
240-590 Washington Zone 12 4/9/2018
240-591 Hagerstown 4/17/2018
240-592 Washington Zone 13 7/1/2016
240-593 Laurel 3/13/2001
240-594 Bittinger 5/15/2018
240-595 Washington Zone 3 9/13/2006
240-596 Ashton 6/11/2018
240-597 Gaithersburg N/A
240-598 Hughesville 6/11/2018
240-599 Washington Zone 10 N/A
NPANXX Area Served1 Date2
240-600 Washington Zone 2 4/27/2011
240-601 Washington Zone 3 N/A
240-602 Washington Zone 3 N/A
240-603 Washington Zone 3 N/A
240-604 Washington Zone 3 N/A
240-605 Washington Zone 3 N/A
240-606 Washington Zone 3 N/A
240-607 Waldorf N/A
240-608 Frederick 3/11/2013
240-609 Cumberland 9/11/2014
240-610 Washington Zone 4 6/11/2018
240-612 Washington Zone 5 N/A
240-613 Washington Zone 4 4/5/2012
240-614 Washington Zone 10 7/16/2013
240-615 Washington Zone 4 5/29/2013
240-616 Washington Zone 13 N/A
240-617 Highfield 7/16/2015
240-618 Washington Zone 10 10/7/2014
240-619 Washington Zone 5 N/A
240-620 Washington Zone 10 N/A
240-621 Washington Zone 11 N/A
240-622 La Plata 6/11/2018
240-623 Washington Zone 4 12/8/2014
240-624 Washington Zone 13 N/A
240-625 Hagerstown 4/17/2001
240-626 Frederick N/A
240-627 Washington Zone 11 N/A
240-628 Mechanicsville 6/11/2018
240-629 Frederick N/A
240-630 Washington Zone 2 10/31/2011
240-631 Gaithersburg N/A
240-632 Gaithersburg N/A
240-633 Hughesville 5/22/2015
240-634 Ridge 6/11/2018
240-635 Tompkinsville 6/11/2018
240-636 Laurel N/A
240-637 Washington Zone 3 6/11/2018
240-638 Washington Zone 3 N/A
240-639 Laurel 6/1/2018
240-640 Waldorf 3/24/2009
240-641 Washington Zone 3 N/A
240-642 Washington Zone 10 8/2/2018
240-643 Washington Zone 3 5/16/2002
240-644 Washington Zone 2 N/A
240-645 Washington Zone 3 N/A
240-646 Laurel N/A
240-647 Clear Spg 6/11/2018
240-648 Keedysville 6/12/2018
240-649 Smithsburg 6/12/2018
240-650 Washington Zone 3 11/17/2011
240-651 Frederick N/A
240-652 Mechanicsville 2/13/2001
240-653 Laurel N/A
240-654 Gaithersburg 5/19/2006
240-655 Kitzmiller 12/18/2017
240-656 Frederick 8/30/2019
240-657 Frostburg 1/6/2016
240-658 Gaithersburg 12/4/2018
240-659 Ashton 1/30/2019
240-660 Washington Zone 10 3/31/2015
240-661 Lexington Park-Great Mills 5/21/2015
240-662 Washington Zone 3 N/A
240-663 Middletown 1/30/2019
240-664 Cumberland 3/6/2019
240-665 Washington Zone 10 1/9/2017
240-666 Nanjemoy 6/25/2015
240-667 Washington Zone 4 N/A
240-668 Damascus N/A
240-669 Washington Zone 11 N/A
240-670 Washington Zone 3 3/6/2012
240-671 Washington Zone 2 N/A
240-672 Washington Zone 10 N/A
240-673 Washington Zone 2 5/17/2019
240-674 Frederick N/A
240-675 Myersville N/A
240-676 Washington Zone 3 N/A
240-677 Washington Zone 5 5/20/2019
240-678 Washington Zone 3 N/A
240-679 Friendsville 6/11/2018
240-680 Frederick 10/29/2018
240-681 Brandywine 10/30/2003
240-682 Waldorf N/A
240-683 Gaithersburg N/A
240-684 Washington Zone 13 N/A
240-685 Brandywine N/A
240-686 Gaithersburg N/A
240-687 Washington Zone 3 N/A
240-688 Washington Zone 3 6/12/2006
240-689 Washington Zone 15 5/28/2019
240-690 Gaithersburg 11/10/2016
240-691 Washington Zone 5 N/A
240-692 Grantsville 5/30/2019
240-693 Walkersville 9/25/2019
240-694 Washington Zone 2 N/A
240-695 Washington Zone 5 N/A
240-696 Washington Zone 4 N/A
240-697 Mechanicsville 9/12/2019
240-698 Myersville 10/15/2019
240-699 Buckeyestown 5/22/2001
NPANXX Area Served1 Date2
240-701 Washington Zone 3 3/25/2009
240-702 Gaithersburg 10/7/2014
240-703 Ashton 2/10/2021
240-704 Washington Zone 3 3/25/2009
240-705 Washington Zone 3 3/25/2009
240-706 Washington Zone 3 3/26/2009
240-707 Hagerstown 1/27/2012
240-708 Laurel 6/8/2012
240-709 Laurel 10/25/2019
240-710 Frederick 12/30/2019
240-712 Laurel 11/1/2011
240-713 Laurel 11/2/2011
240-714 Washington Zone 4 2/20/2015
240-715 Washington Zone 10 N/A
240-716 Washington Zone 5 11/15/2013
240-717 Leonardtown 4/22/2021
240-718 Lexington Park-Great Mills 2/13/2001
240-719 Washington Zone 5 4/11/2016
240-720 Gaithersburg N/A
240-721 Washington Zone 5 3/19/2020
240-722 Ashton N/A
240-723 Washington Zone 3 N/A
240-724 Washington Zone 6 N/A
240-725 Lexington Park-Great Mills N/A
240-726 Washington Zone 4 9/1/2020
240-727 Cumberland N/A
240-728 Washington Zone 10 5/12/2020
240-729 Ashton 6/16/2020
240-730 Hagerstown 8/12/2020
240-731 Washington Zone 10 N/A
240-732 Mount Airy 11/12/2015
240-733 Ashton 7/15/2020
240-734 Smithsburg 3/22/2012
240-735 Brunswick 9/1/2020
240-736 Laurel 9/2/2020
240-737 Washington Zone 4 5/9/2001
240-738 Hancock 9/3/2020
240-739 Frederick 9/15/2020
240-740 Washington Zone 10 9/3/2015
240-741 Frederick 10/1/2020
240-742 Washington Zone 14 11/20/2020
240-743 Washington Zone 2 11/16/2006
240-744 Washington Zone 2 N/A
240-745 Damascus N/A
240-746 Brandywine 12/4/2020
240-747 Washington Zone 11 5/9/2001
240-748 Washington Zone 3 12/23/2020
240-749 Laurel 1/12/2021
240-750 Gaithersburg 5/6/2005
240-751 Gaithersburg N/A
240-752 Washington Zone 2 N/A
240-753 Washington Zone 10 N/A
240-754 Waldorf 11/11/2011
240-755 Laurel 1/5/2006
240-756 Washington Zone 10 2/10/2021
240-757 Washington Zone 13 N/A
240-758 Laurel 3/3/2016
240-759 Washington Zone 15 3/25/2021
240-760 Washington Zone 2 9/22/2015
240-761 Laurel 7/20/2021
240-762 Washington Zone 2 8/22/2012
240-763 Washington Zone 15 10/1/2015
240-764 Washington Zone 4 N/A
240-765 Washington Zone 5 N/A
240-766 Washington Zone 6 N/A
240-767 Washington Zone 5 5/9/2001
240-768 Nanjemoy 4/22/2021
240-769 Keedysville 7/20/2021
240-770 Washington Zone 4 11/22/2004
240-771 Poolesville 2/18/2016
240-772 Frederick 11/17/2011
240-773 Washington Zone 10 N/A
240-774 Lonaconing 10/5/2015
240-775 Westernport 10/5/2015
240-776 La Plata N/A
240-777 Washington Zone 10 N/A
240-778 Washington Zone 10 N/A
240-779 Ashton N/A
240-780 Gaithersburg N/A
240-781 Washington Zone 2 8/18/2015
240-782 Damascus N/A
240-783 Washington Zone 2 N/A
240-784 Myersville 6/6/2001
240-785 Oakland 7/20/2021
240-786 Laurel N/A
240-787 Brandywine N/A
240-788 Washington Zone 5 N/A
240-789 Washington Zone 10 8/10/2021
240-790 Washington Zone 13 N/A
240-791 Washington Zone 4 8/11/2021
240-792 Frederick 8/11/2021
240-793 Gaithersburg 3/15/2001
240-794 Lexington Park-Great Mills N/A
240-795 Washington Zone 5 8/12/2021
240-796 Washington Zone 10 8/25/2021
240-797 Ashton 8/25/2021
240-798 Gaithersburg 9/1/2021
240-799 Brandywine 6/26/2020
NPANXX Area Served1 Date2
240-800 Washington Zone 2 6/22/2012
240-801 Gaithersburg 10/4/2013
240-802 Washington Zone 2 5/10/2013
240-803 Cumberland 1/27/2012
240-804 Tompkinsville 4/23/2001
240-805 Gaithersburg 11/17/2015
240-806 Indian Head 9/30/2015
240-807 Cumberland 9/1/2021
240-808 Leonardtown 3/31/2015
240-809 Smithsburg 9/1/2021
240-810 Washington Zone 10 4/5/2016
240-812 Poolesville N/A
240-813 Gaithersburg N/A
240-814 Laurel 5/20/2022
240-815 Frederick 11/17/2015
240-816 Keedysville 10/5/2015
240-817 Ashton 1/12/2016
240-818 Myersville N/A
240-819 Williamsport 9/1/2021
240-820 Ashton 3/25/2021
240-821 Washington Zone 3 5/27/2005
240-822 New Market 3/15/2021
240-823 Brandywine 2/13/2001
240-824 Frostburg 3/15/2021
240-825 Washington Zone 4 3/17/2016
240-826 Washington Zone 10 5/7/2007
240-827 Lonaconing 9/1/2021
240-828 Washington Zone 4 N/A
240-829 Emmitsburg 9/12/2019
240-830 Washington Zone 5 11/10/2015
240-831 Frederick 4/26/2016
240-832 Washington Zone 2 N/A
240-833 Washington Zone 11 N/A
240-834 Kitzmiller 3/15/2021
240-835 Clear Spg 6/3/2021
240-836 Mt Savage 9/1/2021
240-837 Hughesville 2/13/2001
240-838 Washington Zone 5 3/12/2001
240-839 Washington Zone 3 1/13/2007
240-840 Frederick 6/19/2018
240-841 Laurel N/A
240-842 Washington Zone 14 N/A
240-843 Washington Zone 13 N/A
240-844 Ridge 2/13/2001
240-845 Washington Zone 13 N/A
240-846 Washington Zone 16 N/A
240-847 Washington Zone 3 12/9/2015
240-848 Gaithersburg N/A
240-849 Hagerstown 9/8/2021
240-850 Hagerstown 5/25/2016
240-851 Mccoole 7/16/2020
240-852 Myersville 9/13/2021
240-853 Laurel 9/28/2021
240-854 Washington Zone 4 12/7/2021
240-855 Washington Zone 2 10/9/2006
240-856 Laurel 4/11/2016
240-857 Washington Zone 5 N/A
240-858 Washington Zone 2 7/12/2016
240-859 Ashton 7/11/2016
240-860 Cumberland 8/23/2016
240-861 Ashton 10/7/2021
240-862 Mt Savage 9/2/2016
240-863 Washington Zone 3 N/A
240-864 Washington Zone 10 5/9/2001
240-865 Washington Zone 14 N/A
240-866 Hagerstown 9/20/2019
240-867 Washington Zone 3 6/20/2017
240-868 Washington Zone 12 5/9/2001
240-869 Washington Zone 10 10/7/2021
240-870 Middletown 9/2/2016
240-871 Lexington Park-Great Mills 10/7/2021
240-872 Washington Zone 6 10/7/2021
240-873 Buckeyestown 10/10/2019
240-874 Thurmont 10/10/2019
240-875 Mount Airy 10/10/2019
240-876 Washington Zone 2 N/A
240-877 Frederick 8/25/2016
240-878 Hagerstown 8/3/2017
240-879 Washington Zone 4 10/7/2021
240-880 Washington Zone 11 N/A
240-881 Washington Zone 13 11/4/2021
240-882 Washington Zone 5 N/A
240-883 Ashton N/A
240-884 Tompkinsville 4/29/2021
240-885 Washington Zone 10 1/21/2021
240-886 Washington Zone 4 11/17/2021
240-887 Ashton 12/7/2021
240-888 Washington Zone 10 N/A
240-889 Washington Zone 10 12/6/2021
240-890 Washington Zone 5 12/7/2021
240-891 Damascus 12/10/2021
240-892 Washington Zone 15 N/A
240-893 Washington Zone 3 N/A
240-894 Lexington Park-Great Mills 12/10/2021
240-895 Lexington Park-Great Mills N/A
240-896 Hagerstown 12/28/2021
240-897 Washington Zone 16 N/A
240-898 Washington Zone 4 N/A
240-899 Washington Zone 2 3/13/2001
NPANXX Area Served1 Date2
240-900 Washington Zone 4 2/18/2015
240-901 La Plata 5/22/2014
240-902 Damascus 12/28/2021
240-903 Indian Head 12/3/2013
240-904 Laurel 6/23/2016
240-905 Brandywine 1/10/2022
240-906 Washington Zone 4 N/A
240-907 Washington Zone 10 7/12/2016
240-908 Walkersville 9/2/2016
240-909 Laurel 1/11/2022
240-910 Frederick 3/3/2021
240-912 Gaithersburg N/A
240-913 Damascus 9/2/2016
240-914 Highfield 1/11/2022
240-915 New Market N/A
240-916 Cumberland 1/11/2022
240-917 Laurel 11/12/2015
240-918 Ashton 10/20/2016
240-919 Ashton 1/26/2022
240-920 Cumberland 5/3/2001
240-921 Washington Zone 10 1/26/2022
240-922 Washington Zone 11 7/15/2020
240-923 Washington Zone 6 1/26/2022
240-924 Mount Airy 2/10/2022
240-925 Leonardtown 8/9/2001
240-926 Hughesville 5/18/2022
240-927 Washington Zone 4 5/18/2022
240-928 Myersville 5/26/2022
240-929 Washington Zone 14 N/A
240-930 Laurel 6/29/2022
240-931 Frederick 6/30/2022
240-932 Washington Zone 14 6/30/2022
240-933 Buckeyestown 2/28/2022
240-934 Middletown 2/12/2021
240-935 Laurel 7/12/2022
240-936 Ashton 5/18/2022
240-937 Gaithersburg 7/22/2022
240-938 Ashton 6/6/2001
240-939 Washington Zone 11 7/26/2022
240-940 Washington Zone 4 7/26/2022
240-941 Washington Zone 2 8/3/2022
240-942 Bittinger 3/15/2021
240-943 Frostburg 8/5/2022
240-944 Westernport 3/15/2021
240-945 Washington Zone 3 11/6/2020
240-946 Washington Zone 14 10/25/2021
240-947 Myersville 8/16/2022
240-948 Leonardtown 8/25/2022
240-949 Washington Zone 16 5/9/2001
240-951 Hagerstown 3/24/2022
240-952 Hagerstown 3/24/2022
240-953 Hagerstown 3/24/2022
240-954 Hagerstown 3/24/2022
240-955 La Plata 8/25/2022
240-956 Washington Zone 2 11/6/2020
240-957 Damascus 8/25/2022
240-960 Washington Zone 4 9/1/2022
240-961 Poolesville 9/22/2022
240-962 Laurel 10/6/2022
240-963 Washington Zone 03 10/18/2022
240-964 Cumberland 5/27/2008
240-965 Washington Zone 13 N/A
240-966 Washington Zone 16 2/25/2022
240-967 Cumberland 10/19/2022
240-968 Laurel 10/21/2022
240-969 Walkersville 11/7/2022
240-970 Washington Zone 12 6/2/2015
240-971 Frederick 8/2/2016
240-972 Laurel 5/26/2015
240-973 Washington Zone 12 12/1/2022
240-974 Washington Zone 10 12/21/2022
240-975 Laurel 12/30/2022
240-977 Washington Zone 6 02/22/2023
240-978 Ashton 01/06/2023
240-979 Cumberland N/A
240-980 Leonardtown 01/09/2023
240-981 Gaithersburg 02/10/2023
240-982 Gaithersburg 01/13/2023
240-983 Hagerstown 02/10/2023
240-984 New Market 02/27/2023
240-985 Williamsport 10/17/2016
240-986 Nanjemoy 2/13/2001
240-987 Washington Zone 10 04/05/2023
240-988 Washington Zone 3 N/A
240-989 Myersville 04/20/2023
240-990 Laurel 05/03/2023
240-991 Ashton 05/05/2023
240-992 Washington Zone 10 05/05/2023
240-993 Indian Head 2/13/2001
240-994 Washington Zone 10 N/A
240-995 Flintstone 5/8/2020
240-996 Brunswick 10/17/2016
240-997 Washington Zone 3 N/A
240-998 Hancock 10/17/2016
  1. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  2. Assignment date. N/A - mostly central office codes assigned before 2001.
  3. NXX prefixes last updated: March 1st, 2025

Cities in area code 240

City1 County Time Zone2
Abell St Marys E
Accident Garrett E
Accokeek Prince George's E
Adamstown Frederick E
Andrews Afb Prince George's E
Aquasco Prince George's E
Ashton Montgomery E
Avenue St Marys E
Barnesville Montgomery E
Barton Allegany E
Beallsville Montgomery E
Bel Alton Charles E
Beltsville Prince George's E
Benedict Charles E
Bethesda Montgomery E
Big Pool Washington E
Bittinger Garrett E
Bladensburg Prince George's E
Bloomington Garrett E
Boonsboro Washington E
Bowie Prince George's E
Boyds Montgomery E
Braddock Heights Frederick E
Brandywine Prince George's E
Brentwood Prince George's E
Brinklow Montgomery E
Brookeville Montgomery E
Brownsville Washington E
Brunswick Frederick E
Bryans Road Charles E
Bryantown Charles E
Buckeystown Frederick E
Burkittsville Frederick E
Burtonsville Montgomery E
Bushwood St Marys E
Cabin John Montgomery E
California St Marys E
Callaway St Marys E
Capitol Heights Prince George's E
Cascade Washington E
Cavetown Washington E
Chaptico St Marys E
Charlotte Hall St Marys E
Cheltenham Prince George's E
Chevy Chase Montgomery E
Chewsville Washington E
Clarksburg Montgomery E
Clear Spring Washington E
Clements St Marys E
Clinton Prince George's E
Cobb Island Charles E
College Park Prince George's E
Coltons Point St Marys E
Compton St Marys E
Corriganville Allegany E
Cumberland Allegany E
Damascus Montgomery E
Dameron St Marys E
Derwood Montgomery E
Dickerson Montgomery E
District Heights Prince George's E
Drayden St Marys E
Eckhart Mines Allegany E
Ellerslie Allegany E
Emmitsburg Frederick E
Fairplay Washington E
Faulkner Charles E
Flintstone Allegany E
Fort Washington Prince George's E
Frederick Frederick E
Friendship Anne Arundel E
Friendsville Garrett E
Frostburg Allegany E
Funkstown Washington E
Gaithersburg Montgomery E
Garrett Park Montgomery E
Germantown Montgomery E
Glen Echo Montgomery E
Glenn Dale Prince George's E
Grantsville Garrett E
Great Mills St Marys E
Greenbelt Prince George's E
Hagerstown Washington E
Hancock Washington E
Helen St Marys E
Highland Howard E
Hollywood St Marys E
Hughesville Charles E
Hyattsville Prince George's E
Ijamsville Frederick E
Indian Head Charles E
Ironsides Charles E
Issue Charles E
Jefferson Frederick E
Keedysville Washington E
Kensington Montgomery E
Kitzmiller Garrett E
Knoxville Frederick E
La Plata Charles E
Ladiesburg Frederick E
Lanham Prince George's E
Laurel Anne Arundel E
Leonardtown St Marys E
Lexington Park St Marys E
Libertytown Frederick E
Little Orleans Allegany E
Lonaconing Allegany E
Loveville St Marys E
Luke Allegany E
Marbury Charles E
Maugansville Washington E
Mc Henry Garrett E
Mechanicsville St Marys E
Middletown Frederick E
Midland Allegany E
Midlothian Allegany E
Monrovia Frederick E
Montgomery Village Montgomery E
Morganza St Marys E
Mount Airy Frederick E
Mount Rainier Prince George's E
Mount Savage Allegany E
Mount Victoria Charles E
Myersville Frederick E
Nanjemoy Charles E
New Market Frederick E
New Midway Frederick E
Newburg Charles E
Oakland Garrett E
Oldtown Allegany E
Olney Montgomery E
Owings Calvert E
Oxon Hill Prince George's E
Park Hall St Marys E
Patuxent River St Marys E
Piney Point St Marys E
Pinto Allegany E
Point Of Rocks Frederick E
Pomfret Charles E
Poolesville Montgomery E
Port Tobacco Charles E
Potomac Montgomery E
Rawlings Allegany E
Ridge St Marys E
Riverdale Prince George's E
Rock Point Charles E
Rockville Montgomery E
Rocky Ridge Frederick E
Rohrersville Washington E
Sabillasville Frederick E
Sandy Spring Montgomery E
Scotland St Marys E
Sharpsburg Washington E
Silver Spring Montgomery E
Smithsburg Washington E
Southern MD Facility Prince George's E
Spencerville Montgomery E
Spring Gap Allegany E
St Inigoes St Marys E
St James Washington E
St Marys City St Marys E
Suburb Maryland Fac Montgomery E
Suitland Prince George's E
Swanton Garrett E
Takoma Park Montgomery E
Tall Timbers St Marys E
Temple Hills Prince George's E
Thurmont Frederick E
Tuscarora Frederick E
Unionville Frederick E
Upper Marlboro Prince George's E
Valley Lee St Marys E
Waldorf Charles E
Walkersville Frederick E
Washington Grove Montgomery E
Welcome Charles E
Westernport Allegany E
White Plains Charles E
Williamsport Washington E
Woodsboro Frederick E
  1. Listed above are most places served by USA area code 240. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. E stands for Eastern Time (currently ).
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