| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 401-70** | (312) 401-7000 - (312) 401-7082 | 12 |
| (312) 401-71** | (312) 401-7100 - (312) 401-7188 | 13 |
| (312) 401-72** | (312) 401-7200 - (312) 401-7287 | 4 |
| (312) 401-73** | (312) 401-7310 - (312) 401-7366 | 6 |
| (312) 401-74** | (312) 401-7414 - (312) 401-7474 | 10 |
| (312) 401-75** | (312) 401-7500 - (312) 401-7558 | 9 |
| (312) 401-76** | (312) 401-7600 - (312) 401-7696 | 6 |
| (312) 401-77** | (312) 401-7700 - (312) 401-7789 | 12 |
| (312) 401-78** | (312) 401-7805 - (312) 401-7893 | 12 |
| (312) 401-79** | (312) 401-7903 - (312) 401-7992 | 7 |
US Phone Directory: (312) 401-7***
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