| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 871-50** | (312) 871-5000 - (312) 871-5094 | 10 |
| (312) 871-51** | (312) 871-5102 - (312) 871-5189 | 7 |
| (312) 871-52** | (312) 871-5200 - (312) 871-5281 | 7 |
| (312) 871-53** | (312) 871-5301 - (312) 871-5394 | 10 |
| (312) 871-54** | (312) 871-5406 - (312) 871-5485 | 7 |
| (312) 871-55** | (312) 871-5507 - (312) 871-5599 | 7 |
| (312) 871-56** | (312) 871-5621 - (312) 871-5697 | 9 |
| (312) 871-57** | (312) 871-5705 - (312) 871-5786 | 8 |
| (312) 871-58** | (312) 871-5833 - (312) 871-5899 | 6 |
| (312) 871-59** | (312) 871-5902 - (312) 871-5990 | 11 |
US Phone Directory: (312) 871-5***
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