Area Code Information
| Area Code: | 312 |
| State: | Illinois |
| Primary City: | Chicago, Illinois |
| Time Zone: | Central |
Area code 312 serves the Chicago, Illinois region in Illinois. This area code is in the Central time zone.
Browse Prefixes
Click on any prefix to browse phone numbers in that exchange:
312-200
312-201
312-202
312-203
312-204
312-205
312-206
312-207
312-208
312-209
312-210
312-211
312-212
312-213
312-214
312-215
312-216
312-217
312-218
312-219
312-220
312-221
312-222
312-223
312-224
312-225
312-226
312-227
312-228
312-229
Showing sample prefixes. All prefixes from 200-999 are available.