Local access and transport area
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Local access and transport area (LATA) is a term used in U.S. telecommunications regulation. Under the terms of the Modification of Final Judgment (MFJ), a geographical area within which a divested Regional Bell operating company (RBOC) is permitted to offer exchange telecommunications and exchange access services.
Note: Under the terms of the MFJ, the RBOCs are generally prohibited from providing services that originate in one LATA and terminate in another.
Source: from Federal Standard 1037C
LATA boundaries tend to be drawn around markets, and not necessarily along existing state, province, or even area code borders. Some LATAs cross over state boundaries, such as those for Chicago, Illinois, Portland, Oregon, and areas between Maryland, Virginia, and West Virginia. Area codes and LATAs do not necessarily share boundaries; many LATAs exist in multiple area codes, and many area codes exist in multiple LATAs.
Originally, the LATAs were grouped into regions within which one particular RBOC was allowed to provide services. The LATAs in each of these regions are numbered beginning with the same digit. Generally the LATAs were associated with carriers or other indications in the following manner:
| Digit | Area/Use | RBOC |
|---|---|---|
| 0xx | unused | |
| 1xx | New York & New England | NYNEX |
| 2xx | Mid-Atlantic | Bell Atlantic |
| 3xx | Great Lakes | Ameritech |
| 4xx | Southeast | BellSouth |
| 5xx | South-central | Southwestern Bell |
| 6xx | Northwest, Midwest, and Rocky Mountains | US West |
| 7xx | California and Nevada | Pacific Bell |
| 8xx | Non-contiguous and international areas | |
| 9xx | Expansion |
Since this time, however, some amount of deregulation, as well as a number of phone company mergers, have blurred the significance of these regions. A number of new LATAs have been formed within these regions since their inception, most beginning with the digit 9.
LATAs contribute to an often confusing aspect of long distance telephone service. Due to the various and overlapping regulatory limitations and inter-business arrangements, phone companies typically provide differing types of "long distance" service, each with potentially different rates:
- within same LATA, within same state
- between different LATAs, within same state
- between different LATAs, between different states
Due to the general lack of understanding of the mechanics involved, many long distance companies do not explain the details of these different rates, which can lead to billing questions from surprised customers.
In order to facilitate the sharing of Telcordia telephone routing databases between countries, LATAs were later defined for the provinces of Canada, the other countries and territories of the North American Numbering Plan, and Mexico. Aside from U.S. territories, LATAs have no regulatory purpose in these areas. In 2000, the Canadian CRTC agency eliminated all Canadian provincial LATAs in favor of a single LATA for Canada (888).
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List of LATAs
U.S. state LATAs
The city or place name given with some LATAs is the name given to identify the LATA, not the limit of its boundary. Generally this is the most significant metropolitan area in the LATA. Also, listing under a state does not necessarily limit the LATA's territory to that state; there may be overlaps as well as enclaves. Areas that include notable portions of other states are explained, but not all LATA state overlaps may be detailed.
LATA boundaries are not always solidly defined. Inter-carrier agreements, change proposals to the FCC, and new wiring developments into rural areas can and do often alter the effective borders between LATAs. Many sources on LATA boundary information conflict with each other at detailed levels. Telcordia data may provide the most up-to-date details of LATA inclusions.
- Alabama
- 476 Birmingham, Alabama
- 477 Huntsville, Alabama (Includes Red Bay, Mississippi)
- 478 Montgomery, Alabama
- Includes Georgetown, Georgia
- 480 Mobile, Alabama
- Includes areas of Mississippi north of Pascagoula, Mississippi
- Includes parts of the northeast tip of Florida in the Brewton, Alabama and Walnut Hill, Florida area
- Alaska
- 832
- Arizona
- 666 Phoenix, Arizona
- Includes Winterhaven, California
- Includes Spirit Mountain, Nevada
- Includes Glen Canyon, Utah
- 668 Tucson, Arizona
- Includes Rodeo and Virden, New Mexico
- 980 Navajo Nation (Arizona portion)
- Includes Shiprock, New Mexico
- 666 Phoenix, Arizona
- Arkansas
- 526 Fort Smith, Arkansas
- Includes part of Oklahoma from Pocola to Moffett
- Includes section of Oklahoma from Colcord to Watts
- Includes Colcord, Missouri
- Includes area of Oklahoma near Maysville, Arkansas
- Includes area of Oklahoma near Uniontown, Arkansas
- 528 Little Rock, Arkansas
- Includes Blytheville, Missouri
- Includes Golden, Texas
- Includes New Home, Oklahoma
- 530 Pine Bluff, Arkansas
- Includes parts of Louisiana around Dodge City and Junction City, Arkansas
- 526 Fort Smith, Arkansas
- California
- 722 San Francisco, California
- 724 Chico, California
- 726 Sacramento, California
- 728 Fresno, California
- 730 Los Angeles, California
- Includes La Paz County, Arizona
- 732 San Diego, California
- 734 Bakersfield, California
- 736 Monterey, California
- 738 Stockton, California
- 740 San Luis Obispo, California
- 973 Palm Springs, California
- Colorado
- 656 Denver, Colorado
- Extends into Nebraska near Peetz and Julesburg, Colorado
- 658 Colorado Springs, Colorado
- 656 Denver, Colorado
- Connecticut
- 920
- Delaware
- 228 ~ Note 1
- District of Columbia
- 236
- Includes the west portion of the West Bay of Maryland, as far north as Damascus, Maryland
- Includes the northeasternmost portion of Virginia, from Leesburg to just north of Fredericksburg
- May include Springtown, Pennsylvania
- 236
- Florida
- 448 Pensacola, Florida
- Includes Wing and Florala, Alabama
- 450 Panama City, Florida
- 452 Jacksonville, Florida
- 454 Gainesville, Florida
- 456 Daytona Beach, Florida
- 458 Orlando, Florida
- 460 Southeast Florida
- 939 Fort Myers, Florida
- 952 Tampa, Florida
- 953 Tallahassee, Florida
- 448 Pensacola, Florida
- Georgia
- 438 Atlanta, Georgia
- Includes portion of Alabama from Oakland to Huguley
- Includes Phenix City, Alabama
- Includes Ranburne, Alabama
- 440 Savannah, Georgia
- Includes part of southern South Carolina as far north as Hardeeville and Hilton Head Island
- 442 Augusta, Georgia
- Includes Aiken County and Edgefield County, South Carolina'
- 444 Albany, Georgia
- 446 Macon, Georgia
- 438 Atlanta, Georgia
- Hawaii
- 834
- Idaho
- 652 Southern Idaho
- Includes Malheur County, Oregon, especially the Ontario area
- Includes Jackpot, Jarbidge, and Owyhee, Nevada
- Includes Alta and Border, Wyoming
- 960 Coeur d'Alene, Idaho
- Includes part of northwest Montana as far east as Eureka and as far south as Libby
- Includes Pullman, Washington and surrounding area
- Includes Pend Oreille County, Washington
- 652 Southern Idaho
- Illinois
- 358 Chicago, Illinois
- Includes Lake County and Newton County, Indiana, especially the Gary, Indiana area
- Includes Demotte, Hebron, and Lakes of the Four Seasons, Indiana
- Extends into Wisconsin near Antioch, Illinois
- 360 Rockford, Illinois
- Extends into Wisconsin neat Apple River, Illinois
- 362 Cairo, Illinois
- 364 Sterling, Illinois
- 366 Forrest, Illinois
- 368 Peoria, Illinois
- 370 Champaign, Illinois
- May include areas of Indiana near Danville, Illinois
- 374 Springfield, Illinois
- 376 Quincy, Illinois
- 976 Mattoon, Illinois
- 977 Macomb, Illinois
- 978 Olney, Illinois
- 358 Chicago, Illinois
- Indiana
- 330 Evansville, Indiana
- 332 South Bend, Indiana
- 334 Auburn-Huntington
- 336 Indianapolis, Indiana
- Extends into Illinois near Dana, Indiana
- 338 Bloomington, Indiana
- 937 Richmond, Indiana
- Includes Union City, Ohio
- 938 Terre Haute, Indiana
- Includes Edgar and Clark counties of Illinois
- May include Robinson, Illinois
- Iowa
- 630 Sioux City, Iowa
- Extends into Minnesota near incorporated areas of Iowa along its length
- Includes the eastern portions of Dakota and Thurston counties of Nebraska
- Includes North Sioux City, South Dakota, and extends into South Dakota near Akron and Hawader, Iowa
- 632 Des Moines, Iowa
- Extends into Missouri from Andover, Missouri to south of Davis City, Iowa
- 634 Davenport, Iowa
- Includes portion of Illinois as far as Geneseo and Aledo, Illinois
- Includes the Galena, Illinois area
- 635 Cedar Rapids, Iowa
- 630 Sioux City, Iowa
- Kansas
- 532 Wichita, Kansas
- 534 Topeka, Kansas
- Maine
- 120
- Maryland
- 236 see Washington, D.C.; most of this LATA is actually in Maryland
- 238 Baltimore, Maryland
- 240 Hagerstown, Maryland
- Includes the easternmost part of West Virginia around Martinsburg, West Virginia as far as Route 9
- Includes the northwestern part of the Eastern Panhandle or West Virginia including Keyser, from |Grant County to Short Gap
- Includes area of Pennsylvania just north of Hancock, Maryland
- 242 Salisbury, Maryland
- Massachusetts
- 126 Western Massachusetts
- Includes Stamford, Vermont
- 128 Eastern Massachusetts
- 126 Western Massachusetts
- Michigan
- 340 Detroit, Michigan
- 342 Upper Peninsula of Michigan
- Includes portion of Wisconsin around Iron Mountain, Michigan as far as Rhinelander, Wisconsin and Townsend, Wisconsin
- 344 Saginaw, Michigan
- 346 Lansing, Michigan
- 348 Grand Rapids, Michigan
- Minnesota
- 620 Rochester, Minnesota
- 624 Duluth, Minnesota
- 626 St. Cloud, Minnesota
- 628 Minneapolis, Minnesota
- 636 see North Dakota
- Mississippi
- 482 Jackson, Mississippi
- Includes parts of Alabama around Columbus, Mississippi
- 484 Biloxi, Mississippi
- 482 Jackson, Mississippi
- Missouri
- 520 St. Louis, Missouri
- 521 Westphalia, Missouri
- 522 Springfield, Missouri
- 524 Kansas City, Missouri
- Includes eastern portion of Kansas as far out as U.S. 73 and U.S. 59 and south as U.S. 54
- Montana
- 648 Great Falls, Montana
- 650 Billings, Montana
- 963 Kalispell, Montana (unverified; this LATA appears on some LATA maps and lists, but no exchanges are listed for it)
- Nevada
- 720 Reno, Nevada
- May include Quinn, Oregon
- May include Alpine, Verdi and Coleville, California
- 721 Pahrump, Nevada
- 720 Reno, Nevada
- New Hampshire
- 122
- Includes part of Vermont around Groton
- Includes part of Maine around Kittery and Wilsons Mills
- 122
- New Jersey
- 220 Atlantic Coastal New Jersey
- 222 Delaware Valley
- 224 North Jersey
- New Mexico
- 664
- New York
- 132 New York, New York
- 133 Poughkeepsie, New York
- Includes Milford, Pennsylvania and surrounding area
- 134 Albany, New York
- Includes part of Massachusetts west of Pittsfield and Adams
- 136 Syracuse, New York
- 138 Binghamton, New York
- Includes Sayre, Pennsylvania and surrounding area
- 140 Buffalo, New York
- Includes Ulysses, Pennsylvania and surrounding area
- 921 Fishers Island, New York
- 974 Rochester, New York
- North Dakota
- 636 Brainerd-Fargo ~Note 2
- 638 Bismarck, North Dakota
- Ohio
- 320 Cleveland, Ohio
- 322 Youngstown, Ohio
- 324 Columbus, Ohio
- 325 Akron, Ohio
- 326 Toledo, Ohio
- 328 Dayton, Ohio
- 922 Cincinnati, Ohio
- Includes Rising Sun, Indiana and surrounding area
- Includes the northern tip of Kentucky as far south as Williamstown
- 923 Lima-Mansfield
- Oregon
- 670 Eugene, Oregon
- 672 Portland, Oregon
- Includes Southwestern Washington from Willapa Bay to Goldendale
- Pennsylvania
- 226 Harrisburg, Pennsylvania
- 228 Philadelphia, Pennsylvania ~Note 1
- 230 Altoona, Pennsylvania
- 232 Northeast Pennsylvania
- 234 Pittsburgh, Pennsylvania
- 924 Erie, Pennsylvania
- Rhode Island
- 130 Rhode Island
- South Dakota
- 640
- Tennessee
- 468 Memphis, Tennessee
- Includes part of Mississippi south of Memphis, Tennessee to as far south as Hernando
- 470 Nashville, Tennessee
- 472 Chattanooga, Tennessee
- Includes northwestern tip of Georgia
- 474 Knoxville, Tennessee
- 956 Bristol, Tennessee-Johnson County, Tennessee
- Includes part of Virginia from Abingdon to Wytheville
- 468 Memphis, Tennessee
- Texas
- 540 El Paso, Texas
- 542 Midland, Texas
- 544 Lubbock, Texas
- 546 Amarillo, Texas
- Includes the southern half of the Oklahoma Panhandle
- 548 Wichita Falls, Texas
- 550 Abilene, Texas
- 552 Dallas, Texas
- 554 Longview, Texas
- 556 Waco, Texas
- 558 Austin, Texas
- 560 Houston, Texas
- 562 Beaumont, Texas
- 564 Corpus Christi, Texas
- 566 San Antonio, Texas
- 568 Brownsville, Texas
- 570 Hearne, Texas
- 961 San Angelo, Texas
- Utah
- 660 Utah
- May include Wendover, Mesquite, and Partoun, Nevada
- 981 Navajo Nation (Utah portion)
- 660 Utah
- Vermont
- 124 Vermont
- Includes West Lebanon and West Chesterfield, New Hampshire
- 124 Vermont
- Virginia
- 244 Roanoke, Virginia
- 246 Culpeper, Virginia
- 248 Richmond, Virginia
- 250 Lynchburg, Virginia
- 252 Norfolk, Virginia
- 927 Harrisonburg, Virginia
- 928 Charlottesville, Virginia
- 929 Edinburg, Virginia
- Washington
- 674 Seattle, Washington
- 676 Spokane, Washington
- Includes parts of Oregon including Milton-Freewater and Troy
- Includes a section of Idaho from Lewiston to Grangeville and up to Troy, Idaho and possibly Elk City
- May include Tensed, Idaho
- West Virginia
- 254 Charleston, West Virginia
- Includes part of Virginia east of White Sulphur Springs, West Virginia
- 256 Clarksburg, West Virginia
- 932 Bluefield, West Virginia
- 254 Charleston, West Virginia
- Wisconsin
- 350 Northeast Wisconsin
- Includes the southern corner of Michigan's Upper Peninsula
- 352 Northwest Wisconsin
- 354 Southwest Wisconsin
- 356 Southeast Wisconsin
- 350 Northeast Wisconsin
- Wyoming
- 654
U.S. territory LATAs
- American Samoa - 878/884? ~Note 4
- Guam - 871
- Northern Mariana Islands - 870
- Puerto Rico - 820
- U.S. Virgin Islands - 822
- Wake Island - 836
Non-U.S. LATAs (non-regulatory)
- Mexico - 838
- Bahamas - 824
- Jamaica - 826
- Dominican Republic - 828
- Other Caribbean - 830
- Canada - 888 ~Note 3
- Alberta - 881, 884
- British Columbia - 886
- Manitoba - 888
- New Brunswick - 890
- Newfoundland - 885
- Nova Scotia/P.E.I. - 887,889
- Ontario - 851
- Quebec - 850, 883
- Saskatchewan - 891
- Yukon Territory - 892
Notes
- Includes all of Delaware as well as the metro area of Philadelphia, Pennsylvania.
- Half of LATA 636 occupies eastern North Dakota, the other half takes up the northwest quarter of Minnesota.
- As of 2000, all of Canada uses LATA 888.
- American Samoa entered the NANP in October 2004 and presumably was allocated a LATA by that time. Telcordia LERG data suggests that American Samoa uses LATA 884.
External link
- U.S. LATA map and list (http://www.robotics.net/clec/LATA_Map.html)