| District of Illinois area codes: 630 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 630-281 | Dupage | Naperville, IL | Broadwing Communications |
| 630-282 | Cook | Elk Grove Village, IL | Mci Worldcom Communications |
| 630-283 | Dupage | Roselle, IL | Teleport Communications America |
| 630-284 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-285 | Dupage | Itasca, IL | Ameritech Illinois |
| 630-286 | Dupage | Hinsdale, IL | Xo Illinois |
| 630-287 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-288 | Dupage | Oak Brook, IL | Teleport Communications America |
| 630-289 | Cook | Bartlett, IL | Ameritech Illinois |
| 630-290 | Dupage | Lombard, IL | T-mobile Usa |
| 630-291 | Cook | La Grange Park, IL | Cellco Partnership DBA Verizon Wireless |
| 630-292 | Cook | La Grange Park, IL | Cellco Partnership DBA Verizon Wireless |
| 630-293 | Dupage | West Chicago, IL | Ameritech Illinois |
| 630-294 | Cook | Chicago, IL | Cellco Partnership DBA Verizon Wireless |
| 630-295 | Dupage | Roselle, IL | Ameritech Illinois |
| 630-296 | Cook | Lemont, IL | Teleport Communications America |
| 630-297 | Dupage | Downers Grove, IL | Level 3 Communications |
| 630-298 | Cook | La Grange Park, IL | American Messaging (am) |
| 630-299 | Kane | Aurora, IL | Broadwing Communications |
| 630-300 | Dupage | Naperville, IL | Mci Worldcom Communications |
There are 784 prefixes, In the code area, the major cities are Addison, IL;Aurora, IL;Bartlett, IL;Batavia, IL;Be. The major city is Chicago.