Mr. Dykstra,
I happily found your on-line list of NPA/NXX's (area code plus exchanges) with some geographic information attached.
I work for a non-profit which is just about to conduct a telephone survey of rental households in Los Angeles, and we are seeking maps (or mapable information) about telephone numbers. When we call renters (as well as smaller sample of apartment owners), we want to know if they fall in the City of Los Angeles or an adjacent community.
My understanding is that telephone exchange numbers can represent geographic areas, similar to a ZIP code area or census tract. Is that the case? If so, are there any groups that make maps of telephone exchange areas? I am looking to make such a GIS-based map myself, showing Southern California, but am having trouble finding telephone exchange lists with geographic references (latt/long, etc.) If you could direct me to any source material, I would be grateful.
Sincerely, PATRICK
P.S. I am also looking for GIS boundary files for US Area Code (NPA) boundaries.
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[TELECOM Digest Editor's Note: Generally, that is correct. The area code represents a specific area and the first three digits following that represent a sub-area. For example, your own 213-892 relates to a specific area of Los Angeles. *There are exceptions* now that 'number portability' is possible, but they are few and far between. Maybe someone else can answer your other questions. PAT]