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United States > Arizona > Green Valley > Area Code 520
| Area Code: | 520 |
| State: | Arizona |
| City: | Green Valley |
| Country: | United States |
Supported Exchanges in Area Code 520
| Exchange | County | Carrier |
|---|---|---|
| 520-393 | Pima | Cox Arizona Telcom, Inc. - Az |
| 520-399 | Pima | Level 3 Communications, Llc - |
| 520-625 | Pima | Qwest Corporation - Az |
| 520-648 | Pima | Qwest Corporation - Az |