| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 331-00** | (312) 331-0006 - (312) 331-0085 | 18 |
| (312) 331-01** | (312) 331-0110 - (312) 331-0159 | 8 |
| (312) 331-02** | (312) 331-0203 - (312) 331-0288 | 8 |
| (312) 331-03** | (312) 331-0326 - (312) 331-0370 | 7 |
| (312) 331-04** | (312) 331-0400 - (312) 331-0490 | 9 |
| (312) 331-05** | (312) 331-0514 - (312) 331-0591 | 8 |
| (312) 331-06** | (312) 331-0624 - (312) 331-0696 | 11 |
| (312) 331-07** | (312) 331-0700 - (312) 331-0799 | 10 |
| (312) 331-08** | (312) 331-0807 - (312) 331-0894 | 9 |
| (312) 331-09** | (312) 331-0900 - (312) 331-0950 | 10 |
US Phone Directory: (312) 331-0***
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