| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 315-20** | (312) 315-2004 - (312) 315-2094 | 18 |
| (312) 315-21** | (312) 315-2100 - (312) 315-2194 | 21 |
| (312) 315-22** | (312) 315-2204 - (312) 315-2286 | 15 |
| (312) 315-23** | (312) 315-2323 - (312) 315-2390 | 9 |
| (312) 315-24** | (312) 315-2406 - (312) 315-2487 | 16 |
| (312) 315-25** | (312) 315-2500 - (312) 315-2592 | 18 |
| (312) 315-26** | (312) 315-2600 - (312) 315-2673 | 21 |
| (312) 315-27** | (312) 315-2700 - (312) 315-2792 | 23 |
| (312) 315-28** | (312) 315-2805 - (312) 315-2896 | 19 |
| (312) 315-29** | (312) 315-2903 - (312) 315-2998 | 18 |
US Phone Directory: (312) 315-2***
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