| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 315-40** | (312) 315-4000 - (312) 315-4098 | 14 |
| (312) 315-41** | (312) 315-4101 - (312) 315-4199 | 15 |
| (312) 315-42** | (312) 315-4200 - (312) 315-4299 | 21 |
| (312) 315-43** | (312) 315-4300 - (312) 315-4385 | 18 |
| (312) 315-44** | (312) 315-4400 - (312) 315-4499 | 22 |
| (312) 315-45** | (312) 315-4510 - (312) 315-4599 | 15 |
| (312) 315-46** | (312) 315-4600 - (312) 315-4698 | 20 |
| (312) 315-47** | (312) 315-4700 - (312) 315-4797 | 18 |
| (312) 315-48** | (312) 315-4800 - (312) 315-4889 | 13 |
| (312) 315-49** | (312) 315-4900 - (312) 315-4991 | 19 |
US Phone Directory: (312) 315-4***
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