| 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 |
|---|---|---|---|
| 630-200 | Dupage | Naperville, IL | Cellco Partnership DBA Verizon Wireless |
| 630-201 | Dupage | Naperville, IL | Sprint Spectrum L.p. |
| 630-202 | Cook | La Grange Park, IL | Sprint Spectrum L.p. |
| 630-203 | Cook | Elk Grove Village, IL | Mci Worldcom Communications |
| 630-204 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 630-205 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 630-206 | Dupage | West Chicago, IL | Level 3 Communications |
| 630-207 | Dupage | Hinsdale, IL | New Cingular Wireless PCS |
| 630-208 | Kane | Geneva, IL | Ameritech Illinois |
| 630-209 | Dupage | Hinsdale, IL | New Cingular Wireless PCS |
| 630-210 | Dupage | Naperville, IL | AT&T Local |
| 630-212 | Cook | Wheeling, IL | New Cingular Wireless PCS |
| 630-213 | Cook | Bartlett, IL | Ameritech Illinois |
| 630-214 | Dupage | Hinsdale, IL | Broadwing Communications |
| 630-215 | Cook | La Grange Park, IL | New Cingular Wireless PCS |
| 630-216 | Kane | Big Rock, IL | Rcn Telecom Services Of Illinois |
| 630-217 | Dupage | Roselle, IL | New Cingular Wireless PCS |
| 630-218 | Dupage | Oak Brook, IL | Ameritech Illinois |
| 630-219 | Dupage | Naperville, IL | Level 3 Communications |
| 630-220 | Dupage | Roselle, 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.