| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 399-10** | (312) 399-1003 - (312) 399-1098 | 34 |
| (312) 399-11** | (312) 399-1100 - (312) 399-1196 | 20 |
| (312) 399-12** | (312) 399-1203 - (312) 399-1296 | 21 |
| (312) 399-13** | (312) 399-1304 - (312) 399-1397 | 27 |
| (312) 399-14** | (312) 399-1401 - (312) 399-1496 | 31 |
| (312) 399-15** | (312) 399-1510 - (312) 399-1597 | 20 |
| (312) 399-16** | (312) 399-1602 - (312) 399-1697 | 25 |
| (312) 399-17** | (312) 399-1701 - (312) 399-1796 | 30 |
| (312) 399-18** | (312) 399-1800 - (312) 399-1898 | 23 |
| (312) 399-19** | (312) 399-1903 - (312) 399-1999 | 28 |
US Phone Directory: (312) 399-1***
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