| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 829-40** | (312) 829-4000 - (312) 829-4099 | 40 |
| (312) 829-41** | (312) 829-4100 - (312) 829-4199 | 51 |
| (312) 829-42** | (312) 829-4201 - (312) 829-4298 | 38 |
| (312) 829-43** | (312) 829-4300 - (312) 829-4390 | 32 |
| (312) 829-44** | (312) 829-4403 - (312) 829-4499 | 25 |
| (312) 829-45** | (312) 829-4500 - (312) 829-4599 | 33 |
| (312) 829-46** | (312) 829-4600 - (312) 829-4699 | 47 |
| (312) 829-47** | (312) 829-4706 - (312) 829-4795 | 27 |
| (312) 829-48** | (312) 829-4800 - (312) 829-4898 | 37 |
| (312) 829-49** | (312) 829-4900 - (312) 829-4997 | 29 |
US Phone Directory: (312) 829-4***
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