| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 437-10** | (312) 437-1000 - (312) 437-1073 | 11 |
| (312) 437-11** | (312) 437-1100 - (312) 437-1187 | 16 |
| (312) 437-12** | (312) 437-1200 - (312) 437-1290 | 9 |
| (312) 437-13** | (312) 437-1302 - (312) 437-1388 | 16 |
| (312) 437-14** | (312) 437-1401 - (312) 437-1490 | 9 |
| (312) 437-15** | (312) 437-1500 - (312) 437-1584 | 6 |
| (312) 437-16** | (312) 437-1628 - (312) 437-1641 | 3 |
| (312) 437-17** | (312) 437-1700 - (312) 437-1795 | 14 |
| (312) 437-18** | (312) 437-1801 - (312) 437-1896 | 8 |
| (312) 437-19** | (312) 437-1901 - (312) 437-1998 | 16 |
US Phone Directory: (312) 437-1***
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