| 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 |
|---|---|---|---|
| 630-261 | Dupage | Lombard, IL | Ameritech Illinois |
| 630-262 | Kane | Geneva, IL | Ameritech Illinois |
| 630-263 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 630-264 | Kane | Aurora, IL | Ameritech Illinois |
| 630-265 | Cook | La Grange Park, IL | American Messaging (am) |
| 630-266 | Cook | La Grange Park, IL | Usa Mobility Wireless |
| 630-267 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-268 | Dupage | Lombard, IL | Ameritech Illinois |
| 630-269 | Cook | Summit Argo, IL | Cellco Partnership DBA Verizon Wireless |
| 630-270 | Kane | Aurora, IL | Cellco Partnership DBA Verizon Wireless |
| 630-271 | Dupage | Downers Grove, IL | Ameritech Illinois |
| 630-272 | Dupage | Hinsdale, IL | New Cingular Wireless PCS |
| 630-273 | Kendall | Plano, IL | First Communications LLC |
| 630-274 | Dupage | Bensenville, IL | Teleport Communications America |
| 630-275 | Dupage | Downers Grove, IL | Ameritech Illinois |
| 630-276 | Dupage | Naperville, IL | Mcimetro Access Transmission Services LLC |
| 630-277 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 630-278 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-279 | Dupage | Elmhurst, IL | Ameritech Illinois |
| 630-280 | Dupage | Hinsdale, IL | New Cingular Wireless PCS |
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.