| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 543-70** | (312) 543-7001 - (312) 543-7097 | 16 |
| (312) 543-71** | (312) 543-7102 - (312) 543-7199 | 13 |
| (312) 543-72** | (312) 543-7203 - (312) 543-7272 | 9 |
| (312) 543-73** | (312) 543-7306 - (312) 543-7398 | 19 |
| (312) 543-74** | (312) 543-7400 - (312) 543-7497 | 23 |
| (312) 543-75** | (312) 543-7502 - (312) 543-7594 | 14 |
| (312) 543-76** | (312) 543-7608 - (312) 543-7697 | 14 |
| (312) 543-77** | (312) 543-7707 - (312) 543-7784 | 17 |
| (312) 543-78** | (312) 543-7817 - (312) 543-7895 | 17 |
| (312) 543-79** | (312) 543-7908 - (312) 543-7996 | 12 |
US Phone Directory: (312) 543-7***
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