| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 427-10** | (312) 427-1000 - (312) 427-1092 | 20 |
| (312) 427-11** | (312) 427-1100 - (312) 427-1198 | 32 |
| (312) 427-12** | (312) 427-1200 - (312) 427-1299 | 32 |
| (312) 427-13** | (312) 427-1300 - (312) 427-1388 | 21 |
| (312) 427-14** | (312) 427-1401 - (312) 427-1495 | 20 |
| (312) 427-15** | (312) 427-1500 - (312) 427-1598 | 23 |
| (312) 427-16** | (312) 427-1602 - (312) 427-1697 | 34 |
| (312) 427-17** | (312) 427-1706 - (312) 427-1791 | 22 |
| (312) 427-18** | (312) 427-1804 - (312) 427-1899 | 24 |
| (312) 427-19** | (312) 427-1900 - (312) 427-1997 | 22 |
US Phone Directory: (312) 427-1***
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