| District of Illinois area codes: 224 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 224-320 | Lake | Lake Zurich, IL | First Communications LLC |
| 224-321 | Lake | Waukegan, IL | Sprint Spectrum L.p. |
| 224-323 | Cook | Arlington Hts, IL | Cricket Communications |
| 224-324 | Cook | Arlington Hts, IL | Cricket Communications |
| 224-325 | Kane | Elgin, IL | Cellco Partnership DBA Verizon Wireless |
| 224-326 | Cook | Mt Prospect, IL | Comcast Phone Of Illinois DBA Comco |
| 224-330 | Cook | Northbrook, IL | Xo Illinois |
| 224-333 | Mchenry | Algonquin, IL | Comcast Phone Of Illinois DBA Comco |
| 224-334 | Cook | Arlington Hts, IL | T-mobile Usa |
| 224-336 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 224-337 | Lake | Fox Lake, IL | New Cingular Wireless PCS |
| 224-338 | Lake | Round Lake, IL | Comcast Phone Of Illinois DBA Comco |
| 224-343 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 224-345 | Cook | Arlington Hts, IL | New Cingular Wireless PCS |
| 224-347 | Mci Worldcom Communications | ||
| 224-351 | Lake | Half Day, IL | Mcimetro Access Transmission Services LLC |
| 224-352 | Lake | Half Day, IL | Mcimetro Access Transmission Services LLC |
| 224-353 | Dupage | Roselle, IL | Sigecom |
| 224-355 | Cook | Northbrook, IL | Sprint Spectrum L.p. |
| 224-356 | Dupage | Oak Brook, IL | Ymax Communications Corp. |
There are 292 prefixes, In the code area, the major cities are Algonquin, IL;Arlington Heights, IL;Buffalo Grove,. The major city is Chicago.