LATAs, NPAs, CA, NV, etc. (Local 10-digit dialing?) [Telecom]

>> DON'T confuse LATAs with NPAs! The are NOT always identical,

>>> not even >> I agree, there are *rare* exceptions in California. The only one >> that comes to mind is somewhere on the CA AZ border. Do you know >> of others?

and then John Levine replied:

Huh? LATAs don't match up with NPAs at all in Californa. > > The San Francisco LATA runs from Santa Cruz up to the Oregon border, > including most but not all of AC 707, all of 415, 510, 650, 925, 408, > and part of 831. The Chico LATA is part of AC 530, with the rest of > 530 in the Sacramento LATA. And so forth, for 10 LATAs, the Palm > Springs non-LATA, one little chunk that's part of an Oregon LATA, > three chunks in Nevada LATAs, and one in an Arizona LATA.

and here is more from me (A.B.):

These are the "regular" 10 LATAs and one "LATA-like" territories in California and their three-digit LATA codes as used by Telcordia TRA, Neustar NANPA, etc:

722 San Francisco CA 724 Chico CA 726 Sacramento CA 728 Fresno CA 730 Los Angeles CA 732 San Diego CA 734 Bakersfield CA 736 Monterey CA 738 Stockton CA 740 San Luis Obispo CA

The Los Angeles CA extended LATA (730) also spills-over slightly into western Arizona to serve a handful of non-Bell exchange areas.

Verizon (GTE) has its own 973 Palm Springs CA "LATA-like" territory. I wouldn't refer to it as a "non" LATA. The term LATA isn't uniformly applied to non-Bell regions, but for purposes of (at least incumbent landline) routing and billing, these independnet regions not associated with one of the LATA of Bell territory created for 1984, are still treated as if they are a LATA.

The spill-over from Oregon is New Pine Creek CA, landline ILEC CenturyTel, part of LATA 670 Eugene OR. It appears to have its own remote switch, which would most likely be hosted by an Oregon-based CenturyTel host switch.

There are two "regular" LATAs in Nevada: 720 Reno NV, and 721 Pahrump NV. Nevada Bell (now part of SBC's AT&T) is the legacy incumbent ILEC for both LATAs, although Embarq (once Sprint, once Centel) is really the toll, operator, and "access" provider with its tandem switch in Las Vegas NV for this "Nevada Bell" Pahrump/Las Vegas NV LATA (721).

There is a spill-over for Verdi CA, Bell, part of LATA 720 Reno NV. The dialtone actually comes from the Verdi NV remote switch.

There appears to be two spill-overs into California from the Pahrump NV LATA 721. One comes from the Pahrump NV ratecenter (exchange area), but it might be that the California side has no current customers. I don't know if there was ever an office code for the California-side of Pahrump in a California area code (714 prior to 1982/83, 619 from 1982/83 through 1997, 760 since early 1997), but there is NO 760-NXX office code at the present time for the CA-side of Pahrump NV.

The other spill-over into CA from the Pahrump CA LATA is from Sandy Valley NV (area code 775 since 1998/99) into Sandy CA. Until around 1999 or 2000, the California side of Sandy Valley actually "violated" one of the "basic, expected" US area code "rules" -- they actually shared the 702-later-775 area code of (southern) Nevada and the office code of Sandy Valley NV! As more customers came into the area and requested service, something must have triggered some SBC databases since these new customers' service and billing addresses were in California, with CA zip codes, CA taxes payments, etc., yet the customers were getting (southern) Nevada (Sandy Valley NV) based numbers -- area code 775 (by now) with a Sandy Valley _NV_ office code! All existing customers on the CA-side had to be reassigned to a _new_ office code associated with the CA-based area code (since 1997) 760. Their line numbers remained the same, and a new _CA_ side Sandy Valley ratecenter was created. These customers still get their dialtone from the Sandy Valley NV-side remote switch (hosted by the DMS in Pahrump CA).

As for the spill-over(s) from an Arizona-based LATA, see below:

For details, see this nice map from the CPUC. >

There _used_ to be _several_ California telco infrastructure pdf maps only a few years ago, but some had more color than others, and there were different file sizes as well.

There are two California-based ratecenters, discontiguous from each other, but both along the state line with Arizona, and served out of LATA 666 Phoenix AZ extended area.

There is Winterhaven CA in southeastern California, along the border with Arizona and Mexico, near Yuma AZ. It is served by TDS-Winterhaven Telephone Company and is its own switch.

The other CA-based exchange area, also associated with the Phoenix AZ LATA 666 is _NOT_ shown on the Ca.PUC's map. It _is_ however listed in various Telcordia and NANPA routing and numbering documents, websites, etc. "California City CA" is located slightly south of the point where CA, NV, AZ meet. It is completely surrounded by the Needles CA exchange on its California side. Fort Mojave Telecom serves California City CA, and the dialtone comes from a switch in Mesquite Creek AZ. (This switch serves two other Ft.Mojave Telecom exchange areas as well -- Spirit Mountain NV and Arizona City AZ. I think that these are all associated with a Native American reservation).

Another thing about the CA.PUC map(s) is that these do NOT indicate the various "split" or "sub" ratecenters! This detail IS important, since the "sub" or "split" ratecenters (with different 'DA' or District Area sub-names) do NOT all have identical local EAS calling areas!

Finally, Lisa Hancock asks about the California PUC map of California telecom infrastructure:

I presume the Verizon sections used to be GTE and the AT&T sections > used to be Pacific Bell, correct?

Some of that Verizon-once-GTE was Continental Telephone (Contel) prior to the early 1990s. Both GTE and Contel were all over California prior to GTE buying out Contel circa 1990/91. Contel had service territory all over the US, just like GTE and other large independent telco groups. Contel at one time also had some service areas in Alaska, in Canada (Ontario, Quebec, one exchange in New Brunswick along the border with Maine and adjacent to Maine-based Contel territory), and also five Caribbean island areas in association with Cable & Wireless and the local island government. During the later 1970s and early 1980s, Contel sold off all of its territory outside of the 48 states (in two of the five Caribbean island areas, the left-leaning island governments at one point nationalized Contel's operations, kicking out COntel).

Anyhow, the California PUC telecom maps are VERY well prepared, but they do have those omissions I mentioned. And I also don't know if there really are any customers in that California-side across from Pahrump NV (although there is the Sandy Valley CA region which is across from Sandy Valley NV).


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Anthony Bellanga
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