| District of Illinois area codes: 217 | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Chicago |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 217-222 | Adams | Quincy, IL | Ameritech Illinois |
| 217-223 | Adams | Quincy, IL | Ameritech Illinois |
| 217-224 | Adams | Quincy, IL | Ameritech Illinois |
| 217-225 | Brown | Versailles, IL | Frontier North |
| 217-226 | Christian | Assumption, IL | Illinois Consolidated Telephone Co. |
| 217-227 | Montgomery | Farmersville, IL | Illinois Consolidated Telephone Co. |
| 217-228 | Adams | Quincy, IL | Ameritech Illinois |
| 217-229 | Montgomery | Raymond, IL | Illinois Consolidated Telephone Co. |
| 217-230 | Christian | Edinburg, IL | Mediacom Telephony Of Illinois |
| 217-231 | Adams | Quincy, IL | Ameritech Illinois |
| 217-232 | Coles | Mattoon, IL | Cellular Properties |
| 217-233 | Macon | Decatur, IL | Mcleodusa Telecommunications Services- Il |
| 217-234 | Coles | Mattoon, IL | Illinois Consolidated Telephone Co. |
| 217-235 | Coles | Mattoon, IL | Illinois Consolidated Telephone Co. |
| 217-236 | Pike | Griggsville, IL | Frontier North |
| 217-237 | Christian | Bulpitt, IL | Illinois Consolidated Telephone Co. |
| 217-238 | Coles | Mattoon, IL | Illinois Consolidated Telephone Co. |
| 217-239 | Champaign | Champaign, IL | Mcleodusa Telecommunications Services- Il |
| 217-240 | Effingham | Effingham, IL | Sprint Spectrum L.p. |
| 217-241 | Sangamon | Springfield, IL | Mcleodusa Telecommunications Services- Il |
There are 736 prefixes, In the code area, the major cities are Champaign, IL;Charleston, IL;Danville, IL;Decatur,. The major city is Chicago.