| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 731-00** | (312) 731-0004 - (312) 731-0086 | 8 |
| (312) 731-01** | (312) 731-0112 - (312) 731-0181 | 7 |
| (312) 731-02** | (312) 731-0207 - (312) 731-0297 | 6 |
| (312) 731-03** | (312) 731-0330 - (312) 731-0375 | 4 |
| (312) 731-04** | (312) 731-0405 - (312) 731-0487 | 6 |
| (312) 731-05** | (312) 731-0502 - (312) 731-0572 | 10 |
| (312) 731-06** | (312) 731-0601 - (312) 731-0689 | 6 |
| (312) 731-07** | (312) 731-0710 - (312) 731-0797 | 3 |
| (312) 731-08** | (312) 731-0831 - (312) 731-0898 | 9 |
| (312) 731-09** | (312) 731-0921 - (312) 731-0995 | 6 |
US Phone Directory: (312) 731-0***
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