| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 283-40** | (312) 283-4025 - (312) 283-4060 | 4 |
| (312) 283-41** | (312) 283-4100 - (312) 283-4191 | 7 |
| (312) 283-42** | (312) 283-4208 - (312) 283-4256 | 2 |
| (312) 283-43** | (312) 283-4310 - (312) 283-4399 | 5 |
| (312) 283-44** | (312) 283-4400 - (312) 283-4488 | 5 |
| (312) 283-45** | (312) 283-4528 - (312) 283-4552 | 6 |
| (312) 283-46** | (312) 283-4616 - (312) 283-4684 | 3 |
| (312) 283-47** | (312) 283-4700 - (312) 283-4717 | 3 |
| (312) 283-49** | (312) 283-4901 - (312) 283-4949 | 5 |
US Phone Directory: (312) 283-4***
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