GeoTel Wire Center Boundaries
The Wire Center Dataset is a boundary map and the basic unit of geography for the telecom industry. The boundaries describe the organization of the local telephone exchange system. Each Wire Center serves a unique set of telephone numbers within a fixed geographic area. A telephone number consists of three parts: Area Code (3 digits), Prefix (3 digits), and the Line Number (4 digits). Typically, each Prefix is assigned to one specific Wire Center. This means that numbers are assigned to wire centers to blocks of 10,000. A Wire Center Boundary is a polygon of the area that contains the numbers in a Wire Center. Offered in MapInfo (.TAB) and ESRI (.SHP) formats.

| Fields | Description | Example |
| St_Abr | State Code | MN |
| WireCenter | Wire Center Code | MNFDOHXA |
| AOCN | Administrative Operating Company Number | 0661 |
| LATA | LATA Number | 923 |
| NPA1 | First Area Code | 330 |
| NPA2 | Second Area Code | 419 |
| NPA3 | Third Area Code | 567 |
| NPA4 | Fourth Area Code | 740 |
| NPA5 | Fifth Area Code | 937 |
| NPA6 | Sixth Area Code | * |
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