| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 427-40** | (312) 427-4000 - (312) 427-4080 | 12 |
| (312) 427-41** | (312) 427-4100 - (312) 427-4196 | 9 |
| (312) 427-42** | (312) 427-4200 - (312) 427-4294 | 17 |
| (312) 427-43** | (312) 427-4300 - (312) 427-4393 | 12 |
| (312) 427-44** | (312) 427-4400 - (312) 427-4489 | 17 |
| (312) 427-45** | (312) 427-4500 - (312) 427-4599 | 12 |
| (312) 427-46** | (312) 427-4619 - (312) 427-4686 | 9 |
| (312) 427-47** | (312) 427-4700 - (312) 427-4788 | 9 |
| (312) 427-48** | (312) 427-4800 - (312) 427-4892 | 15 |
| (312) 427-49** | (312) 427-4907 - (312) 427-4997 | 14 |
US Phone Directory: (312) 427-4***
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