| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 540-10** | (312) 540-1000 - (312) 540-1099 | 45 |
| (312) 540-11** | (312) 540-1103 - (312) 540-1187 | 40 |
| (312) 540-12** | (312) 540-1202 - (312) 540-1299 | 40 |
| (312) 540-13** | (312) 540-1301 - (312) 540-1399 | 38 |
| (312) 540-14** | (312) 540-1400 - (312) 540-1497 | 35 |
| (312) 540-15** | (312) 540-1503 - (312) 540-1597 | 31 |
| (312) 540-16** | (312) 540-1602 - (312) 540-1699 | 42 |
| (312) 540-17** | (312) 540-1700 - (312) 540-1799 | 32 |
| (312) 540-18** | (312) 540-1801 - (312) 540-1898 | 37 |
| (312) 540-19** | (312) 540-1900 - (312) 540-1999 | 49 |
US Phone Directory: (312) 540-1***
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