| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 431-00** | (312) 431-0000 - (312) 431-0098 | 34 |
| (312) 431-01** | (312) 431-0100 - (312) 431-0198 | 30 |
| (312) 431-02** | (312) 431-0200 - (312) 431-0298 | 33 |
| (312) 431-03** | (312) 431-0300 - (312) 431-0398 | 41 |
| (312) 431-04** | (312) 431-0400 - (312) 431-0491 | 26 |
| (312) 431-05** | (312) 431-0501 - (312) 431-0599 | 37 |
| (312) 431-06** | (312) 431-0601 - (312) 431-0696 | 32 |
| (312) 431-07** | (312) 431-0701 - (312) 431-0799 | 31 |
| (312) 431-08** | (312) 431-0800 - (312) 431-0899 | 23 |
| (312) 431-09** | (312) 431-0902 - (312) 431-0993 | 22 |
US Phone Directory: (312) 431-0***
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