| District of Arizona area codes: 520 | |
|---|---|
| Country | United States |
| State/Province | Arizona |
| Major City | Phoenix |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 520-362 | Pima | Ajo, AZ | Tohono O'odham Utility Authority |
| 520-363 | Pinal | Kearny, AZ | Qwest Corporation |
| 520-364 | Cochise | Douglas, AZ | Qwest Corporation |
| 520-365 | Pima | Tucson, AZ | Sprint Spectrum L.p. |
| 520-366 | Cochise | Hereford, AZ | Qwest Corporation |
| 520-368 | Cochise | Douglas, AZ | Qwest Corporation |
| 520-369 | Pima | Tucson, AZ | Level 3 Communications |
| 520-370 | Maricopa | Phoenix, AZ | Sprint Spectrum L.p. |
| 520-371 | Pinal | Casa Grande, AZ | Sprint Spectrum L.p. |
| 520-373 | Pima | Tucson, AZ | T-mobile Usa |
| 520-374 | Pinal | Casa Grande, AZ | Qwest Corporation |
| 520-375 | Santa Cruz | Nogales, AZ | Qwest Corporation |
| 520-377 | Santa Cruz | Nogales, AZ | Qwest Corporation |
| 520-378 | Cochise | Sierra Vista, AZ | Qwest Corporation |
| 520-381 | Maricopa | Scottsdale, AZ | Electric Lightwave DBA Integra Telecom |
| 520-382 | Pima | Tucson, AZ | Xspedius Manangement Co. Switched Services Az |
| 520-383 | Pima | Sells, AZ | Tohono O'odham Utility Authority |
| 520-384 | Cochise | Willcox, AZ | Qwest Corporation |
| 520-385 | Pinal | San Manuel, AZ | Qwest Corporation |
| 520-387 | Pima | Ajo, AZ | Table Top Telephone Co. |
There are 477 prefixes, In the code area, the major cities are Casa Adobes, AZ;Casa Grande, AZ;Catalina Foothills. The major city is Phoenix.