MW - 310 area code split to 562

310 area code split to 562 - list of prefixes
Fun Stuff > 1999 > Area Code 310

Looking for City/State from a Phone Number?

Try http://www.fonefinder.net/. It also tells you if it's a cell phone.

Area Code 310 is in the Los Angeles area.

--Matthew 21-Feb-2004
The following is a copy of a web page I made back in 1997. I made it and posted it, and didn't make a single link to the page. Then I submitted it to several search engines to see if I would get any hits. Of course, I did. These days, everyone knows that you should submit things to search engines, and that links aren't the only way, or even a good way for people to get to your page. See the similar 818 Area Code page
--Matthew, 26-Jan-2000

Information on (310) area code split to (310) and (562)

This page has information on the recent area code split of the (310) area code. Also, I'm listing all the affected prefixes in several different formats, which would be useful for writing a program to automatically update a database of phone numbers.

Contents of this Page

Text from notice sent out by phone company (GTE)
List of (310) prefixes changing with 6-month transition period.
List of (310) splitting immediately, 1-week transition.
Both lists in Perl format

Text of a GTE notice sent out to phone customers in the affected area:

New telephone numbers are growing scarce in the greater Los Angeles area's 310 Area Code, so on January 25, 1997, the telecommunications industry is adding a new area code - 562.

About a third of the current 310 Area Code numbers - those located east of the Los Angeles River - are changing to the new 562 Area Code. Parts of Long Beach will stay in the 310 Area Code since those numbers are served by the same switching office that serves Wilmington, which stays in the 310.

To help you change your dialing habits, there will be a six-month transition period for existing prefixes. From January 25 to July 25, either the old or the new way of placing calls to these numbers in the 310 or new 562 Area Code will work. But you're encouraged to begin using the new area code as soon as possible after January 25. Starting July 26, calls placed incorrectly will reach a recorded messag telling you to redial.

Starting February 1, however, you'll have to use the correct area code for 53 new prefixes. Due to a number shortage, these new prefixes will be used in both the 310 and 562 area codes.

Some other things you should know...

The split won't affect the cost of calls between the area codes.
Only the area code will change. Customers moving to the new 562 Area Code will have the same 7-digit number.
The new 562 Area Code is one of the new types of area codes. It does not include a "0" or "1" as the middle number.
Business customers should double check with their PBX service representative to see if changes are necessary for their PBX equipment to process the new area code.
A special, toll-free test number has been set up to verify that PBXs can complete a call to this new type of code. The test number is (562) 317-0317.

Also, don't forget to reprogram...

Speed calling and call forwarding
Automatic dailing services
Other sophisticated services and equipment such as message-detail recording equipment, alternate route or least-cost routing systems, toll restriction, mobile telephone services, cellular telephone service, alarm circuits and PC modems.
800 service... if you have that service with another carrier, check to make sure your 800 number is transitioned to the 562.

Prefix Checklist

Existing prefixes changing to the 562 Area Code.

You are code number will change from 310 to the new 562 Area Code on January 25, if your 7-digit phone number begins with one of the prefixes below. Your 7-digit phone number stays the same. These prefixes will have the six-month transition period, during which dialing 310 or 562 as the area code will work. If your number prefix is NOT listed below, your area code number will NOT change.

210 218 220 227 256 259 272 308 321
356 401 402 403 404 406 407 408 409 
420 421 422 423 424 425 426 427 428
429 430 431 432 433 434 435 436 437 
438 439 460 461 462 463 464 465 466
467 468 469 483 490 491 492 493 494 
495 496 497 498 499 506 520 529 531
555 561 570 590 591 592 593 594 595 
596 597 598 599 601 602 611 621 622
623 624 626 627 628 630 633 634 651 
653 654 663 678 690 691 692 693 694
695 696 697 698 699 709 744 776 790 
795 797 799 801 802 803 804 806 807
809 811 853 860 861 862 863 864 865 
866 867 868 869 877 901 902 903 904
905 906 907 908 916 920 921 922 923 
924 925 926 927 928 929 930 933 936
938 940 941 942 943 944 945 946 947 
948 949 950 951 958 959 961 976 980
981 982 983 984 985 986 987 988 989 
997

Prefixes that require the correct are code starting February 1

Because there's a number shortage, 53 new prefixes will be used in both the 310 and 562 area codes. Unless you're calling someone in your own area code, you must use the correct area code and 7-digit number when dialing these prefixes, starting February 1. There will not be a transition interchangeable dialing period for these prefixes.

213 300 310 388 400 485 500 562 619 666 688
706 707 708 712 714 722 728 733 737 740 741
742 743 745 746 747 748 753 754 755 756 760
766 773 800 805 818 856 857 881 882 883 889
896 897 900 909 918 964 965 972 977

And here are those two lists in a perl format, if you want to cut and paste into a program you're writing. It's pretty simple to change this to other languages, too.

List of prefixes changing from 310 to 562. After July 26, Some of these will be in both area codes.

@prefix_change = (210, 218, 220, 227, 256, 259, 272, 308, 321,
                  356, 401, 402, 403, 404, 406, 407, 408, 409, 
                  420, 421, 422, 423, 424, 425, 426, 427, 428,
                  429, 430, 431, 432, 433, 434, 435, 436, 437, 
                  438, 439, 460, 461, 462, 463, 464, 465, 466,
                  467, 468, 469, 483, 490, 491, 492, 493, 494, 
                  495, 496, 497, 498, 499, 506, 520, 529, 531,
                  555, 561, 570, 590, 591, 592, 593, 594, 595, 
                  596, 597, 598, 599, 601, 602, 611, 621, 622,
                  623, 624, 626, 627, 628, 630, 633, 634, 651, 
                  653, 654, 663, 678, 690, 691, 692, 693, 694,
                  695, 696, 697, 698, 699, 709, 744, 776, 790, 
                  795, 797, 799, 801, 802, 803, 804, 806, 807,
                  809, 811, 853, 860, 861, 862, 863, 864, 865, 
                  866, 867, 868, 869, 877, 901, 902, 903, 904,
                  905, 906, 907, 908, 916, 920, 921, 922, 923, 
                  924, 925, 926, 927, 928, 929, 930, 933, 936,
                  938, 940, 941, 942, 943, 944, 945, 946, 947, 
                  948, 949, 950, 951, 958, 959, 961, 976, 980,
                  981, 982, 983, 984, 985, 986, 987, 988, 989, 
                  997)

List of prefixes splitting. All of these prefixes were 310, and will be used in both 310 and 562. There was a week-long transition period, but after February 1, you'll have to use the correct area code.

@prefix_split = (213, 300, 310, 388, 400, 485, 500, 562, 619, 666, 688,
                 706, 707, 708, 712, 714, 722, 728, 733, 737, 740, 741,
                 742, 743, 745, 746, 747, 748, 753, 754, 755, 756, 760,
                 766, 773, 800, 805, 818, 856, 857, 881, 882, 883, 889,
                 896, 897, 900, 909, 918, 964, 965, 972, 977 )

Why does this page exist? Where did it come from?

I was looking for this information somewhere on the web, but couldn't find it, so I put together this page. So the next person who comes along looking for the same info will find it. I'm pretty impressed with the amount of information available on the Web, but have never contributed, so this is my little contribution. I hope someone finds it useful.

matthew@irvine.com (Note: Old address, don't use)

Matthew's personal home page

Created and maintained by Matthew Weathers. Last updated Jun 24, 2006.