| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 421-80** | (312) 421-8000 - (312) 421-8097 | 37 |
| (312) 421-81** | (312) 421-8100 - (312) 421-8198 | 42 |
| (312) 421-82** | (312) 421-8200 - (312) 421-8294 | 33 |
| (312) 421-83** | (312) 421-8302 - (312) 421-8398 | 30 |
| (312) 421-84** | (312) 421-8400 - (312) 421-8499 | 48 |
| (312) 421-85** | (312) 421-8500 - (312) 421-8599 | 59 |
| (312) 421-86** | (312) 421-8600 - (312) 421-8699 | 40 |
| (312) 421-87** | (312) 421-8700 - (312) 421-8798 | 41 |
| (312) 421-88** | (312) 421-8800 - (312) 421-8897 | 42 |
| (312) 421-89** | (312) 421-8902 - (312) 421-8997 | 38 |
US Phone Directory: (312) 421-8***
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