| 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 |
|---|---|---|---|
| 630-221 | Dupage | Wheaton, IL | Ameritech Illinois |
| 630-222 | Cook | Chicago, IL | Cellco Partnership DBA Verizon Wireless |
| 630-223 | Cook | La Grange Park, IL | Usa Mobility Wireless |
| 630-224 | Dupage | Naperville, IL | Ameritech Illinois |
| 630-225 | Dupage | Warrenville, IL | Broadwing Communications |
| 630-226 | Will | Bolingbrook, IL | Ameritech Illinois |
| 630-227 | Dupage | Bensenville, IL | Ameritech Illinois |
| 630-228 | Dupage | Itasca, IL | Broadwing Communications |
| 630-229 | Kane | Aurora, IL | Comcast Phone Of Illinois DBA Comco |
| 630-230 | Dupage | Hinsdale, IL | Ameritech Illinois |
| 630-231 | Dupage | West Chicago, IL | Ameritech Illinois |
| 630-232 | Kane | Geneva, IL | Ameritech Illinois |
| 630-233 | Cook | Bartlett, IL | Ovation Communications Of Illinois |
| 630-234 | Dupage | West Chicago, IL | New Cingular Wireless PCS |
| 630-235 | Cook | La Grange Park, IL | New Cingular Wireless PCS |
| 630-236 | Kane | Aurora, IL | Ameritech Illinois |
| 630-237 | Dupage | Roselle, IL | Teleport Communications America |
| 630-238 | Dupage | Bensenville, IL | Ameritech Illinois |
| 630-239 | Kane | Batavia, IL | Mci Worldcom Communications |
| 630-240 | Cook | La Grange Park, 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.