| 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 |
|---|---|---|---|
| 630-977 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-978 | Kane | Aurora, IL | Ameritech Illinois |
| 630-979 | Dupage | Naperville, IL | Ameritech Illinois |
| 630-980 | Dupage | Roselle, IL | Ameritech Illinois |
| 630-981 | Dupage | Downers Grove, IL | Xo Illinois |
| 630-982 | Kane | Big Rock, IL | Broadwing Communications |
| 630-983 | Dupage | Naperville, IL | Ameritech Illinois |
| 630-984 | Dupage | Glen Ellyn, IL | Level 3 Communications |
| 630-985 | Dupage | Downers Grove, IL | Ameritech Illinois |
| 630-986 | Dupage | Hinsdale, IL | Ameritech Illinois |
| 630-987 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-988 | Cook | La Grange Park, IL | Cellco Partnership DBA Verizon Wireless |
| 630-989 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 630-990 | Dupage | Oak Brook, IL | Ameritech Illinois |
| 630-991 | Dupage | Downers Grove, IL | New Cingular Wireless PCS |
| 630-992 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 630-993 | Dupage | Elmhurst, IL | Ameritech Illinois |
| 630-994 | Dupage | Roselle, IL | Mci Worldcom Communications |
| 630-995 | Dupage | Naperville, IL | New Cingular Wireless PCS |
| 630-996 | Cook | La Grange Park, IL | Usa Mobility Wireless |
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.