| District of Illinois area codes: 224 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 224-900 | Cook | Wheeling, IL | New Cingular Wireless PCS |
| 224-901 | Lake | Fox Lake, IL | Peerless Network Of Illinois |
| 224-927 | Cook | Northbrook, IL | First Communications LLC |
| 224-935 | Cook | Skokie, IL | Cellco Partnership DBA Verizon Wireless |
| 224-938 | Cook | Des Plaines, IL | Sprint Spectrum L.p. |
| 224-940 | Lake | Deerfield, IL | Mcimetro Access Transmission Services LLC |
| 224-944 | Lake | Waukegan, IL | Sprint Spectrum L.p. |
| 224-948 | Lake | Deerfield, IL | Mcimetro Access Transmission Services LLC |
| 224-990 | Kane | Plato Center, IL | Paetec Communications |
| 224-993 | Lake | Wauconda, IL | Broadwing Communications |
| 224-999 | Cook | Evanston, IL | Level 3 Communications |
| 224-555 | Used in movie | Arlington Hts, IL | Used in movie |
There are 292 prefixes, In the code area, the major cities are Algonquin, IL;Arlington Heights, IL;Buffalo Grove,. The major city is Chicago.