| District of Illinois area codes: 224 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 224-200 | Cook | Arlington Hts, IL | Cricket Communications |
| 224-201 | Cook | Arlington Hts, IL | Cricket Communications |
| 224-202 | Cook | Arlington Hts, IL | Cricket Communications |
| 224-203 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 224-205 | Cook | Elk Grove Village, IL | Cellco Partnership DBA Verizon Wireless |
| 224-206 | Lake | Libertyville, IL | Tds Metrocom Inc.-il |
| 224-207 | Lake | Libertyville, IL | Cimco Communications |
| 224-208 | Cook | Bartlett, IL | AT&T Local |
| 224-209 | Mchenry | Algonquin, IL | New Cingular Wireless PCS |
| 224-210 | Cook | Arlington Hts, IL | Sprint Spectrum L.p. |
| 224-212 | Lake | Lake Forest, IL | Ameritech Illinois |
| 224-213 | Cook | Northbrook, IL | Cellco Partnership DBA Verizon Wireless |
| 224-214 | Lake | Waukegan, IL | New Cingular Wireless PCS |
| 224-215 | Cook | Wilmette, IL | Level 3 Communications |
| 224-216 | Cook | Winnetka, IL | New Cingular Wireless PCS |
| 224-217 | Cook | Des Plaines, IL | Cellco Partnership DBA Verizon Wireless |
| 224-218 | Kane | Hampshire, IL | Sbc Internet Services |
| 224-220 | Cook | Chicago, IL | Sprint Spectrum L.p. |
| 224-221 | Cook | Northbrook, IL | Cricket Communications |
| 224-222 | Cook | Elk Grove Village, IL | Mci Worldcom Communications |
There are 292 prefixes, In the code area, the major cities are Algonquin, IL;Arlington Heights, IL;Buffalo Grove,. The major city is Chicago.