| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 943-50** | (312) 943-5000 - (312) 943-5098 | 44 |
| (312) 943-51** | (312) 943-5103 - (312) 943-5199 | 37 |
| (312) 943-52** | (312) 943-5200 - (312) 943-5299 | 47 |
| (312) 943-53** | (312) 943-5300 - (312) 943-5399 | 54 |
| (312) 943-54** | (312) 943-5400 - (312) 943-5499 | 55 |
| (312) 943-55** | (312) 943-5501 - (312) 943-5599 | 55 |
| (312) 943-56** | (312) 943-5600 - (312) 943-5699 | 36 |
| (312) 943-57** | (312) 943-5700 - (312) 943-5799 | 43 |
| (312) 943-58** | (312) 943-5802 - (312) 943-5899 | 48 |
| (312) 943-59** | (312) 943-5900 - (312) 943-5995 | 40 |
US Phone Directory: (312) 943-5***
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