| District of Illinois area codes: 773 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 773-201 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-202 | Cook | Chicago, IL | Ameritech Illinois |
| 773-203 | Cook | Chicago, IL | New Cingular Wireless PCS |
| 773-204 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-205 | Cook | Chicago, IL | Ameritech Illinois |
| 773-206 | Cook | Chicago, IL | New Cingular Wireless PCS |
| 773-207 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-208 | Cook | Chicago, IL | New Cingular Wireless PCS |
| 773-209 | Cook | Chicago, IL | Sprint Spectrum L.p. |
| 773-210 | Cook | Chicago, IL | Ameritech Illinois |
| 773-212 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-213 | Cook | Chicago, IL | New Cingular Wireless PCS |
| 773-214 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-215 | Cook | Chicago, IL | Usa Mobility Wireless |
| 773-216 | Cook | Chicago, IL | Sprint Spectrum L.p. |
| 773-217 | Cook | Chicago, IL | Cricket Communications |
| 773-218 | Cook | Chicago, IL | New Cingular Wireless PCS |
| 773-219 | Cook | Chicago, IL | Sprint Spectrum L.p. |
| 773-220 | Cook | Chicago, IL | Sprint Spectrum L.p. |
| 773-221 | Cook | Chicago, IL | Ameritech Illinois |
There are 781 prefixes, In the code area, the major cities are Chicago, IL. The major city is Chicago.