| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 375-50** | (312) 375-5000 - (312) 375-5099 | 33 |
| (312) 375-51** | (312) 375-5102 - (312) 375-5199 | 30 |
| (312) 375-52** | (312) 375-5204 - (312) 375-5299 | 29 |
| (312) 375-53** | (312) 375-5303 - (312) 375-5398 | 24 |
| (312) 375-54** | (312) 375-5407 - (312) 375-5496 | 30 |
| (312) 375-55** | (312) 375-5500 - (312) 375-5599 | 43 |
| (312) 375-56** | (312) 375-5603 - (312) 375-5699 | 27 |
| (312) 375-57** | (312) 375-5700 - (312) 375-5799 | 36 |
| (312) 375-58** | (312) 375-5802 - (312) 375-5899 | 29 |
| (312) 375-59** | (312) 375-5905 - (312) 375-5999 | 29 |
US Phone Directory: (312) 375-5***
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