| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 420-40** | (312) 420-4001 - (312) 420-4097 | 35 |
| (312) 420-41** | (312) 420-4100 - (312) 420-4195 | 23 |
| (312) 420-42** | (312) 420-4200 - (312) 420-4299 | 26 |
| (312) 420-43** | (312) 420-4300 - (312) 420-4398 | 20 |
| (312) 420-44** | (312) 420-4408 - (312) 420-4498 | 25 |
| (312) 420-45** | (312) 420-4500 - (312) 420-4598 | 26 |
| (312) 420-46** | (312) 420-4600 - (312) 420-4694 | 24 |
| (312) 420-47** | (312) 420-4702 - (312) 420-4791 | 13 |
| (312) 420-48** | (312) 420-4804 - (312) 420-4899 | 24 |
| (312) 420-49** | (312) 420-4900 - (312) 420-4998 | 23 |
US Phone Directory: (312) 420-4***
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