+1 301 area code (Maryland): Frederick, Gaithersburg, Laurel

What the numbering plan and the regulator's allocation table say about numbers starting +1 301: the place, the line types, every block's status and the carriers those blocks were allocated to. Original allocation, not who serves a number today, and never who owns or calls from a number.

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Response

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The range at a glance

Country	United States (US)
Calling code	+1
Prefix	301
Place named for the range	Maryland
Rate centres with most codes (NANPA)	Frederick, Gaithersburg, Laurel
Time zones	America/New_York (Eastern Standard Time, UTC−5, UTC−4 in daylight saving time)
Line types by the numbering plan	fixed_line_or_mobile
Example format	+1 301-200-0000

+1 301 in NANPA’s area code report

+1 301 is a North American area code for Maryland, one of the original 1947 codes, sharing its area with 227, 240, per NANPA’s NPA report of 20 October 2026.

Shares its area with	227, 240 (an overlay complex)
State, province or territory	Maryland
In service since	1947
Local calls dialled as	10 digits (1 + 10 digits also allowed)
NANPA’s dialling note	1+10 digit dialing for all calls permissible at service providers discretion.
Time zones (NANPA)	Eastern
Relief planning	none under way

Rate centres with the most allocated codes (NANPA)

Each central office code is assigned for a rate centre, the regulator’s billing area for it, named after a town or exchange. It is not where a subscriber is: mobile and VoIP numbers are used anywhere, and a ported number keeps its rate centre. The 784 assigned codes in 301 are spread over 49 rate centres (the files name none for 510 of the codes).

named after	rate centres	codes
Frederick	1	37
Gaithersburg	1	33
Laurel	2	28
Waldorf	1	25
Hagerstown	1	21
Cumberland	1	14
Ashton	2	11
Lexington Park Great Mills	1	11
Damascus	2	10
Leonardtown	1	9
Myersville	1	9
Oakland	1	8

34 more with fewer codes

Indian Head (6)
Brandywine (4)
Keedysville (3)
La Plata (3)
Mechanicsville (3)
Brunswick (2)
Buckeystown (2)
Clear Spring (2)
Friendsville (2)
Frostburg (2)
Kitzmiller (2)
Mount Airy (2)
New Market (2)
Poolesville (2)
Walkersville (2)
Baltimore (1)
Bittinger (1)
Emmitsburg (1)
Flintstone (1)
Grantsville (1)
Hancock (1)
Highfield (1)
Hughesville (1)
Lonaconing (1)
McCoole (1)
Middletown (1)
Mount Savage (1)
Nanjemoy (1)
Ridge (1)
Smithsburg (1)
Thurmont (1)
Tompkinsville (1)
Westernport (1)
Williamsport (1)

Codes assigned in the last 12 months, and codes not yet in service

NANPA’s central office code file of 20 October 2026 lists 0 codes in 301 assigned in the 12 months to 20 October 2026, and 10 thousands-blocks inside its pooled codes. Nothing is waiting to enter service. NANPA dates codes from 2001 on only: 62 of the 784 codes carry a date, so an undated code is not a new one. A code not yet in service is waiting for its effective date; a reassigned block can hold numbers used before. Original allocation, not who serves a number today.

Blocks in the regulator's table

Each block is a 6-digit prefix of the national number. A number in an allocated block is assignable; in an unassigned block no carrier can have a subscriber, so the lookup answers unassigned_block for it, except a number in a range reserved for fiction (is_fictional), which answers valid even where the regulator lists its block as protected. Of the allocated blocks, 18.4% belong to a wireless carrier, 2.9% to a virtual-number wholesaler or VoIP provider, and 78.7% to a holder whose name settles neither.

Allocated	784
Unassigned	0
Reserved	16
Total blocks	800

Who the blocks were allocated to

The holders as the regulator lists them, by number of allocated blocks. Allocation is not service: a ported number keeps its original block, so a holder here may no longer serve a given number. The last row adds up every other allocated block in the table: the smaller holders and any holder this page does not name. 397 of these codes are pooled into thousands-blocks, which carriers other than the code holder can hold. This page counts codes; a lookup of a US number names the holder of the number's own thousands-block where NANPA lists it.

holder	brand	kind	blocks	share
VERIZON MARYLAND, INC.	Verizon	unsettled	463	59.1%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	Verizon	mobile	51	6.5%
NEW CINGULAR WIRELESS PCS, LLC - DC	AT&T	mobile	47	6.0%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC	Verizon	unsettled	40	5.1%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	T-Mobile	mobile	31	4.0%
TELEPORT COMMUNICATIONS AMERICA, LLC - DC	AT&T	unsettled	31	4.0%
LEVEL 3 COMMUNICATIONS, LLC - MD	Lumen	unsettled	15	1.9%
METROPCS, INC.	T-Mobile	mobile	14	1.8%
COMCAST IP PHONE, LLC	Comcast	unsettled	12	1.5%
BANDWIDTH.COM CLEC, LLC - MD	Bandwidth	voip	11	1.4%
All other blocks (21 holders not listed)	—	—	69	8.8%

What each network brand’s legal entities hold across the whole table, counted in numbers: Verizon, AT&T, T-Mobile, Lumen, Comcast, Bandwidth, Spok, Windstream, Inteliquent, Optimum.

All 784 assigned central office codes in 301

Each row is a central office code (the three digits after the area code) as NANPA’s central office code file lists it: the rate centre it is assigned for, the network brand of the code holder where the brand map knows one, and the date it was assigned where the file gives one. Original allocation, not who serves a number today: a ported number keeps its code, and in a pooled code the blocks of a thousand can be held by carriers other than the code holder. There is no page per code.

show all 784 codes

code	rate centre	code holder’s brand	assigned	note
301-200	Indian Head	Bandwidth	2011-02-24	pooled
301-201	—	AT&T	2022-11-07	pooled
301-202	—	AT&T	2008-12-19	pooled
301-203	—	Verizon	—
301-204	—	AT&T	—	pooled
301-205	—	Verizon	—	pooled
301-206	—	Verizon	—
301-207	—	Spok	—
301-208	Gaithersburg	Verizon	—
301-209	—	Verizon	—
301-210	Laurel	Verizon	—
301-212	—	Verizon	—	pooled
301-213	—	T-Mobile	—	pooled
301-214	—	Verizon	—
301-215	—	Verizon	—	pooled
301-216	Gaithersburg	Verizon	—
301-217	—	Verizon	—
301-218	—	Verizon	—
301-219	—	AT&T	—
301-220	—	Verizon	—	pooled
301-221	—	AT&T	—
301-222	—	Windstream	—	pooled
301-223	Williamsport	Verizon	—	pooled
301-224	—	Spok	—
301-225	—	AT&T	2009-05-21	pooled
301-226	—	Verizon	—
301-227	—	Verizon	—
301-228	Frederick	Verizon	—	pooled
301-229	—	Verizon	—
301-230	—	Verizon	—
301-231	—	Verizon	—	pooled
301-232	Ashton	Verizon	—	pooled
301-233	—	Verizon	—
301-234	—	Verizon	—	pooled
301-235	—	Verizon	—	pooled
301-236	—	Verizon	—
301-237	—	T-Mobile	—	pooled
301-238	—	Verizon	—	pooled
301-239	—	Verizon	—
301-240	—	Verizon	—	pooled
301-241	Highfield	Verizon	—	pooled
301-242	Brandywine	Verizon	—	pooled
301-243	—	Verizon	2006-07-20	pooled
301-244	—	Windstream	—	pooled
301-245	Bittinger	Verizon	—	pooled
301-246	Nanjemoy	Verizon	—	pooled
301-247	Leonardtown	AT&T	—
301-248	—	Verizon	—
301-249	—	Verizon	—
301-250	Gaithersburg	Verizon	—	pooled
301-251	—	Verizon	—
301-252	Gaithersburg	T-Mobile	—	pooled
301-253	Damascus	Verizon	—
301-254	—	T-Mobile	—	pooled
301-255	—	Verizon	—	pooled
301-256	Laurel	Verizon	—	pooled
301-257	—	T-Mobile	—	pooled
301-258	—	Verizon	—
301-259	Tompkinsville	Verizon	—	pooled
301-260	Ashton	Verizon	—	pooled
301-261	—	Verizon	—
301-262	—	Verizon	—
301-263	—	Verizon	—	pooled
301-264	Mount Savage	Verizon	—	pooled
301-265	—	Verizon	—	pooled
301-266	Waldorf	AT&T	—
301-267	—	T-Mobile	2011-10-04	pooled
301-268	Cumberland	T-Mobile	—	pooled
301-269	—	Verizon	2014-11-11	pooled
301-270	—	Verizon	—
301-271	Thurmont	Verizon	—	pooled
301-272	—	Verizon	—	pooled
301-273	—	Verizon	—	pooled
301-274	Hughesville	Verizon	—	pooled
301-275	—	AT&T	—	pooled
301-276	—	Verizon	—	pooled
301-277	—	Verizon	—
301-278	—	Verizon	—	pooled
301-279	—	Verizon	—
301-280	—	Verizon	—
301-281	—	Verizon	—	pooled
301-282	—	Verizon	—
301-283	—	Verizon	—	pooled
301-284	—	Verizon	—	pooled
301-285	—	Verizon	—
301-286	—	Verizon	—
301-287	—	Verizon	—	pooled
301-288	—	Verizon	—	pooled
301-289	—	Verizon	—	pooled
301-290	Mechanicsville	Verizon	—	pooled
301-291	—	Verizon	—	pooled
301-292	—	Verizon	—
301-293	Myersville	Verizon	—
301-294	—	Verizon	—
301-295	—	Verizon	—
301-296	—	Verizon	—	pooled
301-297	—	Verizon	—	pooled
301-298	—	Verizon	—	pooled
301-299	—	Verizon	—
301-300	—	Verizon	2007-03-30	pooled
301-301	Gaithersburg	Inteliquent	2022-08-30	pooled
301-302	Hagerstown	T-Mobile	2004-10-05	pooled
301-303	—	Spok	—
301-304	Walkersville	Comcast	2007-03-06	pooled
301-305	Frederick	T-Mobile	—	pooled
301-306	—	Verizon	—
301-307	—	Verizon	—	pooled
301-308	—	Spok	—
301-309	—	Verizon	—	pooled
301-310	Laurel	Verizon	—	pooled
301-312	—	AT&T	—	pooled
301-313	—	Verizon	—	pooled
301-314	—	Windstream	—
301-315	—	Verizon	—
301-316	—	Verizon	—	pooled
301-317	Laurel	Verizon	—
301-318	—	AT&T	—	pooled
301-319	—	Verizon	—
301-320	—	Verizon	—
301-321	—	Inteliquent	—	pooled
301-322	—	Verizon	—
301-323	Laurel	Lumen	—	pooled
301-324	—	Verizon	—
301-325	—	Verizon	—
301-326	—	T-Mobile	—	pooled
301-327	—	Comcast	2006-03-09	pooled
301-328	—	Comcast	2006-06-21	pooled
301-329	Ashton	Inteliquent	—	pooled
301-330	Gaithersburg	Verizon	—
301-331	Hagerstown	AT&T	—	pooled
301-332	—	AT&T	—
301-333	—	Verizon	—
301-334	Oakland	Verizon	—
301-335	—	AT&T	—	pooled
301-336	—	Verizon	—
301-337	Gaithersburg	Verizon	—	pooled
301-338	Cumberland	—	2006-01-31	pooled
301-339	—	Windstream	—	pooled
301-340	—	Verizon	—
301-341	—	Verizon	—
301-342	Lexington Park Great Mills	Verizon	—
301-343	—	T-Mobile	—	pooled
301-344	—	Verizon	—
301-345	—	Verizon	—
301-346	—	AT&T	—
301-347	—	Verizon	—	pooled
301-348	—	Verizon	—	pooled
301-349	Poolesville	Verizon	—	pooled
301-350	—	Verizon	—
301-351	—	Verizon	—
301-352	—	Verizon	—
301-353	—	Verizon	—
301-354	—	AT&T	—	pooled
301-355	Gaithersburg	Verizon	2005-12-08	pooled
301-356	Laurel	—	—	pooled
301-357	—	Verizon	2006-10-12	pooled
301-358	—	Lumen	—	pooled
301-359	Westernport	Verizon	—	pooled
301-360	Frederick	Verizon	—	pooled
301-361	—	Lumen	—
301-362	Laurel	Verizon	—
301-363	Damascus	Lumen	2006-08-16	pooled
301-364	—	Verizon	—	pooled
301-365	—	Verizon	—
301-366	Gaithersburg	T-Mobile	—	pooled
301-367	—	Verizon	—
301-368	Damascus	Verizon	—	pooled
301-369	—	Verizon	—
301-370	Gaithersburg	T-Mobile	—	pooled
301-371	Middletown	Verizon	—	pooled
301-372	—	Verizon	—	pooled
301-373	Leonardtown	Verizon	—	pooled
301-374	Waldorf	Verizon	—	pooled
301-375	Indian Head	Verizon	—	pooled
301-376	Laurel	Verizon	—
301-377	Laurel	Comcast	—	pooled
301-378	Frederick	Comcast	2007-02-20	pooled
301-379	—	T-Mobile	—	pooled
301-380	—	Verizon	—
301-381	—	Inteliquent	2022-07-15	pooled
301-382	—	Verizon	—
301-383	—	Comcast	—	pooled
301-384	—	Verizon	—
301-385	—	AT&T	—
301-386	—	Verizon	—
301-387	Oakland	Verizon	—	pooled
301-388	—	Verizon	—	pooled
301-389	—	Lumen	—	pooled
301-390	—	Verizon	—
301-391	Damascus	Verizon	—	pooled
301-392	La Plata	Verizon	—	pooled
301-393	Hagerstown	Verizon	—	pooled
301-394	—	Verizon	—
301-395	Laurel	Verizon	—	pooled
301-396	Waldorf	Verizon	—	pooled
301-397	—	Verizon	—	pooled
301-398	—	Verizon	2003-10-09	pooled
301-399	Waldorf	T-Mobile	—	pooled
301-400	—	Verizon	2010-03-29	pooled
301-401	Frederick	AT&T	—
301-402	—	Verizon	—
301-403	—	Verizon	—
301-404	—	T-Mobile	—	pooled
301-405	—	Windstream	—
301-406	—	Spok	—
301-407	Gaithersburg	Verizon	—	pooled
301-408	—	Verizon	—	pooled
301-409	—	Inteliquent	—	pooled
301-410	—	Inteliquent	2022-05-05	pooled
301-412	—	AT&T	—
301-413	—	Verizon	—
301-414	Damascus	Verizon	—	pooled
301-415	—	Verizon	—
301-416	Myersville	Verizon	—	pooled
301-417	—	Verizon	—	pooled
301-418	Frederick	Verizon	2002-11-20	pooled
301-419	—	Verizon	—
301-420	—	Verizon	—
301-421	Ashton	Verizon	—
301-422	—	Verizon	—
301-423	—	Verizon	—
301-424	—	Verizon	—
301-425	—	Verizon	—
301-426	—	Verizon	—	pooled
301-427	—	Verizon	—
301-428	—	Verizon	—
301-429	—	Verizon	—
301-430	—	Verizon	—	pooled
301-431	—	Verizon	—
301-432	Keedysville	Verizon	—	pooled
301-433	—	Verizon	—	pooled
301-434	—	Verizon	—
301-435	—	Verizon	—
301-436	—	Verizon	—
301-437	—	T-Mobile	—	pooled
301-438	—	Verizon	—	pooled
301-439	—	Verizon	—
301-440	—	T-Mobile	—	pooled
301-441	—	Verizon	—
301-442	—	T-Mobile	—	pooled
301-443	—	Verizon	—
301-444	—	Verizon	—	pooled
301-445	—	Verizon	—
301-446	—	Verizon	—	pooled
301-447	Emmitsburg	Verizon	—	pooled
301-448	—	Comcast	—	pooled
301-449	—	Verizon	—
301-450	—	AT&T	2022-07-15	pooled
301-451	—	Verizon	—
301-452	—	Verizon	—
301-453	Kitzmiller	Verizon	—	pooled
301-454	—	Verizon	—	pooled
301-455	—	T-Mobile	—	pooled
301-456	—	Comcast	—	pooled
301-457	—	Verizon	—
301-458	—	AT&T	—	pooled
301-459	—	Verizon	—
301-460	—	Verizon	—
301-461	—	Verizon	—
301-462	Myersville	T-Mobile	—	pooled
301-463	Lonaconing	Verizon	—	pooled
301-464	—	Verizon	—
301-465	Myersville	T-Mobile	—	pooled
301-466	—	Verizon	—
301-467	—	Verizon	—
301-468	—	Verizon	—
301-469	—	Verizon	—
301-470	—	Verizon	—	pooled
301-471	Frederick	Verizon	—
301-472	Mechanicsville	Verizon	—
301-473	Frederick	Verizon	—	pooled
301-474	—	Verizon	—
301-475	Leonardtown	Verizon	—
301-476	Ashton	Verizon	—	pooled
301-477	—	Comcast	—	pooled
301-478	Flintstone	Verizon	—	pooled
301-479	—	Verizon	—	pooled
301-480	—	Verizon	—
301-481	Leonardtown	Verizon	—
301-482	Damascus	Verizon	—	pooled
301-483	Laurel	Verizon	—
301-484	—	Comcast	—
301-485	—	Comcast	—	pooled
301-486	—	Verizon	—	pooled
301-487	Myersville	Verizon	—
301-488	—	Verizon	—
301-489	—	Verizon	—	pooled
301-490	Laurel	Verizon	—
301-491	Hagerstown	T-Mobile	—	pooled
301-492	—	Verizon	—
301-493	—	Verizon	—
301-494	—	Verizon	—	pooled
301-495	—	Verizon	—
301-496	—	Verizon	—
301-497	Laurel	Verizon	—
301-498	Laurel	Verizon	—
301-499	—	Verizon	—
301-500	—	Verizon	—	pooled
301-501	Oakland	AT&T	—	pooled
301-502	—	Verizon	—
301-503	—	AT&T	—
301-504	—	Verizon	—
301-505	—	Verizon	—
301-506	—	Spok	—
301-507	—	Verizon	—	pooled
301-508	Myersville	AT&T	—	pooled
301-509	—	Verizon	—
301-510	—	Spok	—
301-512	—	Verizon	—
301-513	—	Verizon	—	pooled
301-514	Frederick	Verizon	—
301-515	Gaithersburg	Verizon	—
301-516	—	Verizon	—
301-517	—	Verizon	—	pooled
301-518	—	Verizon	—
301-519	Gaithersburg	Verizon	—
301-520	—	Verizon	—
301-521	—	Verizon	—
301-522	—	Verizon	—
301-523	—	T-Mobile	—	pooled
301-524	Frederick	T-Mobile	—	pooled
301-525	Gaithersburg	—	2003-10-16	pooled
301-526	—	AT&T	—
301-527	Gaithersburg	Verizon	—
301-528	Gaithersburg	Verizon	—
301-529	—	AT&T	—
301-530	—	Verizon	—
301-531	—	—	—	pooled
301-532	Laurel	T-Mobile	2015-02-20	pooled
301-533	Oakland	Verizon	—	pooled
301-534	Indian Head	—	2006-11-15	pooled
301-535	Waldorf	AT&T	—
301-536	Leonardtown	T-Mobile	—	pooled
301-537	—	T-Mobile	—	pooled
301-538	—	AT&T	—
301-539	La Plata	AT&T	—	pooled
301-540	Gaithersburg	Verizon	—
301-541	—	AT&T	—	pooled
301-542	Waldorf	AT&T	—	pooled
301-543	Laurel	AT&T	—	pooled
301-544	—	Verizon	—
301-545	—	Verizon	—	pooled
301-546	—	Verizon	2014-04-07	pooled
301-547	—	AT&T	—	pooled
301-548	—	Verizon	—
301-549	Ashton	Verizon	—	pooled
301-550	—	AT&T	2022-07-26	pooled
301-551	—	—	—
301-552	—	Verizon	—
301-553	Waldorf	Spok	—
301-554	—	Spok	—
301-556	Gaithersburg	AT&T	—	pooled
301-557	—	Lumen	2011-09-06	pooled
301-558	—	T-Mobile	2025-07-01	pooled
301-559	—	Verizon	—
301-560	—	Windstream	—
301-561	—	—	—
301-562	—	Verizon	—
301-563	—	Verizon	—	pooled
301-564	—	Verizon	—
301-565	—	Verizon	—
301-566	—	Verizon	—
301-567	—	Verizon	—
301-568	—	Verizon	—
301-569	Gaithersburg	Verizon	—	pooled
301-570	Ashton	Verizon	—
301-571	—	Verizon	—
301-572	—	Verizon	—
301-573	Hagerstown	T-Mobile	—	pooled
301-574	—	Verizon	—	pooled
301-575	Laurel	Windstream	—	pooled
301-576	—	Windstream	—
301-577	—	Verizon	—
301-578	—	Verizon	—	pooled
301-579	Brandywine	Verizon	—	pooled
301-580	—	Verizon	—
301-581	—	Verizon	—
301-582	Hagerstown	Verizon	—	pooled
301-583	—	Verizon	—	pooled
301-584	—	—	—
301-585	—	Verizon	—
301-586	—	Verizon	—	pooled
301-587	—	Verizon	—
301-588	—	Verizon	—
301-589	—	Verizon	—
301-590	—	Verizon	—	pooled
301-591	Gaithersburg	Windstream	—	pooled
301-592	—	Verizon	—	pooled
301-593	—	Verizon	—
301-594	—	Verizon	—
301-595	—	Verizon	—
301-596	Laurel	Verizon	—
301-597	Waldorf	AT&T	2022-01-24	pooled
301-598	—	Verizon	—
301-599	—	Verizon	—
301-600	Frederick	Verizon	2006-07-06	pooled
301-601	—	Verizon	—
301-602	—	Verizon	—
301-603	—	Verizon	—	pooled
301-604	Laurel	Verizon	—
301-605	—	Verizon	—	pooled
301-606	Frederick	Verizon	—
301-607	Damascus	Verizon	—	pooled
301-608	—	Verizon	—
301-609	Waldorf	Verizon	—	pooled
301-610	—	Verizon	—	pooled
301-612	—	AT&T	2012-10-11	pooled
301-613	—	T-Mobile	—	pooled
301-614	—	Verizon	—
301-615	—	Bandwidth	—
301-616	Oakland	T-Mobile	—	pooled
301-617	Laurel	Verizon	—
301-618	—	Verizon	—	pooled
301-619	Frederick	Verizon	—
301-620	Frederick	Verizon	—
301-621	—	Verizon	—
301-622	—	Verizon	—
301-623	—	AT&T	—	pooled
301-624	Frederick	Verizon	—	pooled
301-625	—	Verizon	—
301-626	—	Verizon	—
301-627	—	Verizon	—
301-628	—	AT&T	—	pooled
301-629	—	Verizon	—	pooled
301-630	—	Verizon	—
301-631	Frederick	Verizon	—	pooled
301-632	Waldorf	Verizon	—	pooled
301-633	—	AT&T	—
301-634	—	AT&T	—
301-635	—	Bandwidth	2022-07-27	pooled
301-636	—	Verizon	—	pooled
301-637	—	Lumen	—	pooled
301-638	Waldorf	Verizon	—	pooled
301-639	Frederick	Verizon	—
301-640	—	Verizon	—	pooled
301-641	—	Verizon	—
301-642	—	AT&T	—
301-643	Waldorf	Verizon	—
301-644	Frederick	Verizon	—	pooled
301-645	Waldorf	Verizon	—
301-646	—	AT&T	—
301-647	—	—	—
301-648	—	AT&T	—
301-649	—	Verizon	—
301-650	—	Verizon	—
301-651	—	Verizon	—
301-652	—	Verizon	—
301-653	Waldorf	AT&T	—
301-654	—	Verizon	—
301-655	—	AT&T	—
301-656	—	Verizon	—
301-657	—	Verizon	—
301-658	Ashton	AT&T	—	pooled
301-659	Waldorf	AT&T	—	pooled
301-660	Keedysville	AT&T	2004-03-19	pooled
301-661	—	AT&T	—
301-662	Frederick	Verizon	—
301-663	Frederick	Verizon	—
301-664	—	Verizon	—	pooled
301-665	Hagerstown	Verizon	—	pooled
301-666	—	AT&T	—	pooled
301-667	Myersville	AT&T	—
301-668	Frederick	Verizon	—
301-669	—	Verizon	—
301-670	—	Verizon	—
301-671	Hagerstown	Bandwidth	—
301-672	Lexington Park Great Mills	T-Mobile	—	pooled
301-673	Frederick	AT&T	—	pooled
301-674	—	T-Mobile	—	pooled
301-675	—	T-Mobile	—
301-676	Frederick	AT&T	—
301-677	—	AT&T	—
301-678	Hancock	Verizon	—	pooled
301-679	—	AT&T	—	pooled
301-680	—	Verizon	—
301-681	—	Verizon	—
301-682	Frederick	Verizon	—	pooled
301-683	—	AT&T	—	pooled
301-684	Indian Head	AT&T	—	pooled
301-685	Damascus	AT&T	—	pooled
301-686	—	Verizon	—	pooled
301-687	Frostburg	Verizon	—	pooled
301-688	—	Verizon	—
301-689	Frostburg	Verizon	—	pooled
301-690	Leonardtown	—	2007-05-23	pooled
301-691	Poolesville	AT&T	—	pooled
301-692	—	AT&T	—	pooled
301-693	Frederick	T-Mobile	—
301-694	Frederick	Verizon	—
301-695	Frederick	Verizon	—
301-696	Frederick	Verizon	—
301-697	Cumberland	AT&T	—
301-698	Frederick	Verizon	—
301-699	—	Verizon	—
301-701	—	Bandwidth	—	pooled
301-702	—	Verizon	—
301-703	Mount Airy	Lumen	2002-08-29	pooled
301-704	—	Verizon	—
301-705	Waldorf	Verizon	—	pooled
301-706	—	Verizon	—
301-707	Cumberland	T-Mobile	—	pooled
301-708	Laurel	Verizon	—	pooled
301-709	Cumberland	Optimum	2019-05-28	pooled
301-710	Waldorf	Lumen	2005-12-30	pooled
301-712	Frederick	Verizon	—	pooled
301-713	—	Verizon	—
301-714	Hagerstown	Verizon	—	pooled
301-715	—	AT&T	—	pooled
301-716	—	Verizon	—
301-717	—	Verizon	—
301-718	—	Verizon	—
301-719	—	AT&T	—	pooled
301-720	Brandywine	AT&T	—	pooled
301-721	—	Verizon	—
301-722	Cumberland	Verizon	—
301-723	Cumberland	Verizon	—	pooled
301-724	Cumberland	Verizon	—
301-725	Laurel	Verizon	—
301-726	Kitzmiller	Verizon	2023-02-07	pooled
301-727	—	—	—
301-728	—	T-Mobile	—
301-729	Cumberland	Verizon	—
301-730	Myersville	AT&T	—
301-731	—	Verizon	—
301-732	Frederick	T-Mobile	—	pooled
301-733	Hagerstown	Verizon	—
301-734	—	Verizon	—
301-735	—	Verizon	—
301-736	—	Verizon	—
301-737	Lexington Park Great Mills	Verizon	—
301-738	—	Verizon	—
301-739	Hagerstown	Verizon	—
301-740	Gaithersburg	Verizon	2004-04-22	pooled
301-741	Laurel	Lumen	—	pooled
301-742	—	AT&T	—
301-743	Indian Head	Verizon	—	pooled
301-744	Indian Head	Verizon	—	pooled
301-745	Hagerstown	Verizon	—	pooled
301-746	Friendsville	Verizon	—	pooled
301-747	—	AT&T	—	pooled
301-748	Frederick	T-Mobile	—	pooled
301-749	—	Verizon	—
301-750	Friendsville	—	2004-03-18	pooled
301-751	Waldorf	Verizon	—
301-752	Waldorf	Verizon	—
301-753	—	Verizon	—	pooled
301-754	—	Verizon	—	pooled
301-755	—	Verizon	—	pooled
301-756	—	Lumen	—	pooled
301-757	Lexington Park Great Mills	Verizon	—
301-758	—	Verizon	—
301-759	Cumberland	Verizon	—
301-760	—	Lumen	2002-02-27	pooled
301-761	—	Lumen	2002-02-27	pooled
301-762	—	Verizon	—
301-763	—	Verizon	—
301-764	Waldorf	Verizon	—	pooled
301-765	—	Verizon	—	pooled
301-766	Hagerstown	Verizon	—
301-767	—	Verizon	—	pooled
301-768	—	Lumen	2002-02-27	pooled
301-769	Leonardtown	Verizon	—	pooled
301-770	—	Verizon	—
301-771	—	Verizon	—	pooled
301-772	—	Verizon	—
301-773	—	Verizon	—
301-774	Ashton	Verizon	—
301-775	—	Verizon	—
301-776	Laurel	Verizon	—
301-777	Cumberland	Verizon	—	pooled
301-778	—	Verizon	—	pooled
301-779	—	Verizon	—
301-780	—	Verizon	—	pooled
301-781	—	Inteliquent	2022-05-04	pooled
301-782	Brandywine	Verizon	—	pooled
301-783	Cumberland	Bandwidth	—
301-784	Cumberland	Verizon	—	pooled
301-785	—	Verizon	—
301-786	McCoole	Verizon	—	pooled
301-787	—	Verizon	—	pooled
301-788	Frederick	Verizon	—
301-789	—	—	2002-08-13	pooled
301-790	Hagerstown	Verizon	—
301-791	Hagerstown	Verizon	—
301-792	—	T-Mobile	—
301-793	—	T-Mobile	—
301-794	—	Verizon	—	pooled
301-795	—	Verizon	—	pooled
301-796	—	Verizon	2003-06-30
301-797	Hagerstown	Verizon	—
301-798	Damascus	Verizon	—	pooled
301-799	Keedysville	—	2004-03-18	pooled
301-800	Hagerstown	T-Mobile	—	pooled
301-801	—	Verizon	—
301-802	—	Verizon	—
301-803	—	Verizon	—	pooled
301-804	Ashton	Verizon	—	pooled
301-805	—	Verizon	—
301-806	—	T-Mobile	—	pooled
301-807	—	Verizon	—
301-808	—	Verizon	—
301-809	—	Verizon	—	pooled
301-810	Buckeystown	Inteliquent	—	pooled
301-812	—	Verizon	—	pooled
301-813	—	—	—
301-814	—	AT&T	—
301-815	Frederick	Verizon	—
301-816	—	Verizon	—
301-817	—	Verizon	—
301-818	Waldorf	Bandwidth	—
301-819	—	Verizon	—
301-820	Gaithersburg	AT&T	—	pooled
301-821	Laurel	AT&T	—	pooled
301-822	—	Verizon	—	pooled
301-823	—	AT&T	—	pooled
301-824	Smithsburg	Verizon	—	pooled
301-825	—	AT&T	—	pooled
301-826	Lexington Park Great Mills	Verizon	—
301-827	—	Verizon	—
301-828	—	AT&T	—	pooled
301-829	Mount Airy	Verizon	—	pooled
301-830	—	AT&T	—	pooled
301-831	Damascus	Verizon	—
301-832	—	AT&T	—	pooled
301-833	—	AT&T	—	pooled
301-834	Brunswick	Verizon	—	pooled
301-835	Frederick	—	2018-11-27	pooled
301-836	—	Verizon	—	pooled
301-837	—	Verizon	—	pooled
301-838	—	Verizon	—	pooled
301-839	—	Verizon	—
301-840	—	Verizon	—
301-841	—	Verizon	—	pooled
301-842	Clear Spring	Verizon	—	pooled
301-843	—	Verizon	—
301-844	—	T-Mobile	2011-10-04	pooled
301-845	Walkersville	Verizon	—	pooled
301-846	Frederick	Verizon	—	pooled
301-847	—	Verizon	—	pooled
301-848	Waldorf	Verizon	—
301-849	Oakland	Bandwidth	—
301-850	—	Lumen	—	pooled
301-851	—	Verizon	—	pooled
301-852	—	Verizon	—	pooled
301-853	—	Verizon	—
301-854	Ashton	Verizon	—	pooled
301-855	—	Verizon	—
301-856	—	Verizon	—
301-857	Clear Spring	—	2002-07-12	pooled
301-858	—	Verizon	—
301-859	Oakland	Lumen	2002-01-09	pooled
301-860	—	Verizon	—	pooled
301-861	Waldorf	Lumen	—	pooled
301-862	Lexington Park Great Mills	Verizon	—	pooled
301-863	Lexington Park Great Mills	Verizon	—
301-864	—	Verizon	—
301-865	New Market	Verizon	—
301-866	Lexington Park Great Mills	Verizon	—	pooled
301-867	—	Verizon	—	pooled
301-868	—	Verizon	—
301-869	Gaithersburg	Verizon	—
301-870	—	Verizon	—
301-871	—	Verizon	—
301-872	Ridge	Verizon	—	pooled
301-873	—	Verizon	—
301-874	Buckeystown	Verizon	—
301-875	Laurel	Verizon	—	pooled
301-876	Cumberland	Lumen	2002-05-02	pooled
301-877	—	Verizon	—
301-878	Baltimore	Verizon	—
301-879	—	Verizon	—
301-880	Lexington Park Great Mills	Lumen	—	pooled
301-881	—	Verizon	—
301-882	New Market	—	2004-03-18	pooled
301-883	—	Verizon	—	pooled
301-884	Mechanicsville	Verizon	—
301-885	Waldorf	Verizon	—	pooled
301-886	—	Bandwidth	—	pooled
301-887	—	Verizon	—	pooled
301-888	—	Verizon	—	pooled
301-889	—	Verizon	—	pooled
301-890	—	Verizon	—
301-891	—	Verizon	—	pooled
301-892	—	Verizon	2005-03-11	pooled
301-893	—	Verizon	—	pooled
301-894	—	Verizon	—
301-895	Grantsville	Verizon	—	pooled
301-896	—	Verizon	—
301-897	—	Verizon	—
301-898	Frederick	Verizon	—	pooled
301-899	—	Verizon	—
301-900	—	Inteliquent	2015-02-18	pooled
301-901	—	Verizon	—	pooled
301-902	—	Verizon	—	pooled
301-903	—	Verizon	—
301-904	Leonardtown	Verizon	—
301-905	—	Verizon	—	pooled
301-906	—	AT&T	—
301-907	—	Verizon	—	pooled
301-908	—	Verizon	—
301-909	—	Verizon	—	pooled
301-910	—	AT&T	—
301-912	—	Verizon	—	pooled
301-913	—	Verizon	—	pooled
301-914	Oakland	—	2012-12-27	pooled
301-915	—	—	—	pooled
301-916	Gaithersburg	Verizon	—
301-917	—	—	—	pooled
301-918	—	Verizon	—	pooled
301-919	—	AT&T	—
301-920	—	—	—	pooled
301-921	—	Verizon	—	pooled
301-922	—	Verizon	—
301-923	—	Bandwidth	—	pooled
301-924	—	Verizon	—
301-925	—	Verizon	—
301-926	Gaithersburg	Verizon	—
301-927	—	Verizon	—
301-928	—	Verizon	—
301-929	—	Verizon	—
301-930	—	Verizon	—
301-931	—	Verizon	—	pooled
301-932	Waldorf	Verizon	—
301-933	—	Verizon	—
301-934	La Plata	Verizon	—
301-935	—	Verizon	—	pooled
301-936	Hagerstown	Telnyx	2017-06-02	pooled
301-937	—	Verizon	—
301-938	—	Verizon	—
301-939	—	Verizon	—	pooled
301-940	—	Verizon	—
301-941	—	Verizon	—	pooled
301-942	—	Verizon	—
301-943	—	Verizon	—
301-944	Gaithersburg	Verizon	—	pooled
301-945	—	Verizon	—	pooled
301-946	—	Verizon	—
301-947	Gaithersburg	Verizon	—
301-948	—	Verizon	—
301-949	—	Verizon	—
301-951	—	Verizon	—
301-952	—	Verizon	—
301-953	—	Verizon	—	pooled
301-955	—	Verizon	—	pooled
301-956	Gaithersburg	Verizon	2002-05-22	pooled
301-957	Laurel	Verizon	—	pooled
301-960	—	Verizon	—	pooled
301-961	—	Verizon	—
301-962	—	Verizon	—	pooled
301-963	Gaithersburg	Verizon	—
301-964	Myersville	AT&T	—	pooled
301-965	—	Verizon	—	pooled
301-966	—	Verizon	—	pooled
301-967	—	Verizon	—
301-968	—	Verizon	—	pooled
301-969	Brunswick	Comcast	2007-03-06	pooled
301-970	—	Verizon	—	pooled
301-971	—	—	—	pooled
301-972	Gaithersburg	Verizon	—
301-973	—	Bandwidth	—	pooled
301-974	Laurel	—	—	pooled
301-975	—	Verizon	—	pooled
301-977	Gaithersburg	Verizon	—
301-978	—	Verizon	—	pooled
301-979	—	T-Mobile	—	pooled
301-980	—	Verizon	—
301-981	—	Lumen	—
301-982	—	Verizon	—
301-983	—	Verizon	—
301-984	—	Verizon	—
301-985	—	Verizon	—	pooled
301-986	—	Verizon	—
301-987	Gaithersburg	Verizon	—
301-988	Hagerstown	T-Mobile	—	pooled
301-989	—	Verizon	—
301-990	Gaithersburg	Verizon	—
301-991	Hagerstown	T-Mobile	—	pooled
301-992	Hagerstown	T-Mobile	—	pooled
301-993	—	Verizon	—
301-994	Lexington Park Great Mills	Verizon	—	pooled
301-995	Lexington Park Great Mills	Verizon	—
301-996	—	T-Mobile	—	pooled
301-997	Leonardtown	Verizon	—	pooled
301-998	—	Verizon	—

How to read this page

Everything above comes from three public sources: the numbering metadata, which names the zones and the line types of the range and, outside North America, its place; and the regulator's allocation table, which lists each block's status and holder and, in North America, the rate centres the place is named from. NANPA’s NPA report adds what it says about the whole area code: its state or province, the codes sharing its area, when it went into service, local dialling and relief planning. None of them knows who serves a number today, whether a handset is switched on, or who owns or answers it. Spaw reports what the tables say and names the dataset and version behind every answer.

More area codes in the United States

nanpa-co-codes 2026-10-18 · nanpa-rate-centres 2026-10-18 · nanpa-npa-report 2026-10-20 · newest data dated 2026-10-20 · about the regulator’s table

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