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Local Access And Transport Area

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List of LATAs

US 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. In some cases, a LATA is named after the largest phone exchange in the LATA that was historically served by an RBOC. For example, the largest city in the Pahrump LATA in Nevada is Las Vegas. Since Las Vegas was not historically served by an RBOC, the LATA is named after the smaller town of Pahrump, which was historically served by Nevada Bell (now AT&T Inc.). 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 Federal Communications Commission (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

Alaska

  • 832

Arizona

Arkansas

California

Colorado

Connecticut

  • 920

Washington, D.C.

Florida

Map of FL 5-digit LATAs

Georgia

Hawaii

  • 834

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

  • 120

Maryland

Massachusetts

  • 126 Western Massachusetts
  • 128 Eastern Massachusetts

Michigan

Minnesota

Mississippi

Missouri

  • 520 St. Louis
    • Includes part of south-central Illinois southwest of Springfield.
  • 521 Westphalia (per locallingguide.com, includes Columbia MO)
  • 522 Springfield
  • 524 Kansas City
    • Includes eastern portion of Kansas as far out as U.S. 73 and U.S. 59 and south as far as U.S. 54
  • 521 Central Missouri: Columbia and surrounding areas

Montana

  • 648 Great Falls
  • 650 Billings
  • 963 Kalispell (historical)
    • note: LATA 963 appears on many LATA lists, and at least one map, but is no longer a separate LATA-equivalent area. It is now part of LATA 648.

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

  • 664

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

  • 130 Rhode Island

South Carolina

South Dakota

  • 640

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

  • 350 Northeast Wisconsin
  • 352 Northwest Wisconsin
  • 354 Southwest Wisconsin
  • 356 Southeast Wisconsin

Wyoming

  • 654

U.S. territory LATAs

Non-U.S. LATAs (non-regulatory)

Canada

As LATAs exist for US regulatory purposes, where they serve as a demarcation between intra-LATA calls (handled by regional Bell operating companies) and inter-LATA calls (handled by interstate long distance carriers such as AT&T), they have no legal significance in Canada.

As of 2000, all of Canada (except for non-geographic numbers) is identified as LATA 888.

The use of this LATA set to identify individual provinces is therefore deprecated:

Local interconnection region

Canada does define local interconnection regions (LIR's), which determine where points of interconnection (POI) must be provided by competing local exchange and mobile carriers to provide local number portability.[4] A Canadian LIR is geographically smaller than a US LATA, typically comparable in size to a small city's flat-rate local calling area or to an entire large regional municipality. In areas where a small-city Digital Multiplex System controls a group of remote switching centres, one for each surrounding village, the local interconnect region normally includes each exchange in the city plus all downstream remotes of those exchanges.[5] In a Toronto-sized city, the LIR will include only the city itself.

While the LIRs resemble local calling areas in geographic size, there are some key differences:

  • LIR's normally do not include incumbent local independent telephone company exchanges in locations not opened to competition, where the independent numbers are currently not portable.
  • LIR's do not cross provincial boundaries. Lloydminster has an LIR for each province, as does Ottawa-Hull.
  • LIR's closely follow network topology, which often does not match a local flat-rate calling area as local calling is defined by arbitrary regulatory constructs.

One example: The tiny unincorporated village of Beebe Plain, divided by the Quebec-Vermont border, is served by +1-819-876 Rock Island, Quebec, Canada (a remote station controlled from Magog) and +1-802-873 Derby Line, Vermont, USA (a remote station controlled from St. Johnsbury). Magog and St. Johnsbury are both a long-distance call from anywhere in Beebe Plain, even though Canadian subscribers can place local calls to Sherbrooke, US subscribers can locally call Newport and an international call within the village is local. An LIR assignment which follows network topology places the Canadian remote station in Magog's LIR, not Sherbrooke's LIR.[6]

See also

Notes

  1. ^ a b Half of LATA 636 occupies eastern North Dakota, the other half takes up the northwest quarter of Minnesota.
  2. ^ LATA 228 includes all of Delaware as well as the metro area of Philadelphia, Pennsylvania.
  3. ^ 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.
  4. ^ http://www.crtc.gc.ca/eng/archive/2007/dt2007-23.htm
  5. ^ List of Canadian LIRs on localcallingguide.com
  6. ^ Rock Island QC on localcallingguide.com