| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 427-80** | (312) 427-8000 - (312) 427-8090 | 12 |
| (312) 427-81** | (312) 427-8101 - (312) 427-8168 | 6 |
| (312) 427-82** | (312) 427-8200 - (312) 427-8289 | 8 |
| (312) 427-83** | (312) 427-8307 - (312) 427-8378 | 8 |
| (312) 427-84** | (312) 427-8400 - (312) 427-8486 | 12 |
| (312) 427-85** | (312) 427-8500 - (312) 427-8597 | 14 |
| (312) 427-86** | (312) 427-8600 - (312) 427-8683 | 9 |
| (312) 427-87** | (312) 427-8727 - (312) 427-8798 | 5 |
| (312) 427-88** | (312) 427-8802 - (312) 427-8899 | 14 |
| (312) 427-89** | (312) 427-8900 - (312) 427-8990 | 5 |
US Phone Directory: (312) 427-8***
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