| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 280-70** | (312) 280-7047 - (312) 280-7047 | 1 |
| (312) 280-71** | (312) 280-7193 - (312) 280-7193 | 1 |
| (312) 280-72** | (312) 280-7270 - (312) 280-7280 | 3 |
| (312) 280-73** | (312) 280-7300 - (312) 280-7359 | 20 |
| (312) 280-75** | (312) 280-7500 - (312) 280-7599 | 23 |
| (312) 280-76** | (312) 280-7600 - (312) 280-7699 | 39 |
| (312) 280-77** | (312) 280-7700 - (312) 280-7796 | 53 |
| (312) 280-78** | (312) 280-7800 - (312) 280-7898 | 57 |
| (312) 280-79** | (312) 280-7900 - (312) 280-7997 | 40 |
US Phone Directory: (312) 280-7***
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