| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 558-10** | (312) 558-1000 - (312) 558-1092 | 15 |
| (312) 558-11** | (312) 558-1100 - (312) 558-1195 | 13 |
| (312) 558-12** | (312) 558-1200 - (312) 558-1258 | 28 |
| (312) 558-13** | (312) 558-1300 - (312) 558-1399 | 42 |
| (312) 558-14** | (312) 558-1420 - (312) 558-1499 | 43 |
| (312) 558-15** | (312) 558-1530 - (312) 558-1598 | 29 |
| (312) 558-16** | (312) 558-1616 - (312) 558-1699 | 28 |
| (312) 558-17** | (312) 558-1722 - (312) 558-1797 | 10 |
| (312) 558-18** | (312) 558-1850 - (312) 558-1852 | 2 |
| (312) 558-19** | (312) 558-1900 - (312) 558-1999 | 11 |
US Phone Directory: (312) 558-1***
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