Area code 425

At a glance

Country code

+1

State

WA

Exchanges on record

647

Carriers on record

26

Most exchanges: Lumen 138, Frontier 122, T-Mobile 91.

The exchange map

Formats and patterns

Any 425 number, in E.164

^\+1425[2-9]\d{6}$

+1, the area code, a central office code that does not start with 0 or 1, then four digits.

^\+1425(?:2(?:0[09]|1[07-9]|2[019]|3[12689]|4[0146]|6[089]|73|8[017]|99)|3(?:0[1689]|1[49]|2[04-8]|3[01]|4[03-6]|5[019]|6[245]|7[015]|8[0-2479]|9[03])|4(?:03|1[47-9]|2[289]|[36][569]|4[2-59]|59|7[0-389]|80|9[459])|5(?:0[1358]|1[5-8]|2[01]|3[0-249]|4[023578]|5[04]|6[15-8]|7[01459]|8[1389]|9[125])|6(?:06|15|2[3-68]|3[13]|5[259]|81)|7(?:3[67]|5[034]|6[0156]|7[023]|8[05])|8(?:02|29|30|64|7[069]|9[014])|9(?:19|22|[34]1|7[19]|[89]5))\d{4}$

^\+1425(?:2(?:0[1-578]|1[2-46]|2[2-8]|3[3-57]|4[257-9]|[57][0-24-9]|6[1-7]|8[2-689]|9[013-8])|3(?:0[02-57]|1[0235-8]|2[129]|3[2-9]|4[127-9]|5[2-8]|6[136-9]|7[2-46-9]|8[358]|9[124-8])|4(?:0[12457-9]|1[02356]|2[013-7]|3[0-478]|4[0167]|5[0-8]|6[0-378]|8[1-35-9]|9[1-36-8])|5(?:0[267]|1[349]|2[2-9]|3[38]|4[46]|5[16-8]|6[02-49]|7[236-8]|8[05-7]|9[09])|6(?:0[23589]|14|2[29]|3[5-8]|4[0134679]|5[13467]|6[03]|7[0237-9]|8[6-8]|9[0178])|7(?:0[2-9]|1[027]|2[278]|3[289]|4\d|5[57]|7[14-68]|8[36-9]|9[13])|8(?:0[36]|1[48]|2[0-3578]|3[15-7]|44|6[157-9]|7[37]|8[0-3589]|9[235-9])|9(?:0[238]|1[78]|2[13]|3[69]|4[357-9]|5[1-467]|6[1578]|7[0347]|8[148]|9[069]))\d{4}$

^\+1425(?:2(?:15|30|43|92)|3(?:86|99)|4(?:0[06]|48|[68]4|7[4-7]|90)|5(?:0[04]|1[02]|3[5-7]|4[19]|5[239]|8[24]|98)|6(?:[02]0|1[06]|4[258]|5[08]|6[5-79]|7[15]|8[39]|9[69])|7(?:25|58|77|9[059])|8(?:00|32|4[25]|66|71)|9(?:0[056]|2[08]|30|4[046]|55|6[2369]|98))\d{4}$

The exchange patterns follow the original allocations; a number ported since keeps its digits but not necessarily its carrier or its line type.

Carriers and their exchanges

Every carrier holding exchanges in 425, with the exchanges allocated to it (the three digits after the area code).

Questions developers ask

Where is area code 425?

Area code 425 is in Washington, in the United States: all 647 of its exchanges on record are there. From abroad it is dialled +1 425, then the seven-digit number.

Is a 425 number mobile or landline?

Either: in the North American Numbering Plan the line type belongs to the exchange (the three digits after the area code), not to the area code. Of the 647 exchanges on record in 425, 177 (27%) were allocated as mobile, 374 (58%) as fixed line, 77 (12%) as VoIP and 19 (3%) have no line type on record. A number can have been ported since, to another carrier and even to another line type.

Which carriers have numbers in area code 425?

26 carriers hold exchanges in 425 on record; the most: Lumen (138), Frontier (122) and T-Mobile (91). These are the original allocations: with number portability, a number may be served by another carrier today, which only a live carrier lookup (an HLR or MNP query) can tell.

How do I validate a 425 phone number?

In E.164 a 425 number matches ^\+1425[2-9]\d{6}$: +1, the area code, a central office code that does not start with 0 or 1, then four digits. Written nationally it reads (425) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP.