| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 240-00** | (312) 240-0000 - (312) 240-0098 | 32 |
| (312) 240-01** | (312) 240-0100 - (312) 240-0198 | 36 |
| (312) 240-02** | (312) 240-0200 - (312) 240-0297 | 27 |
| (312) 240-03** | (312) 240-0300 - (312) 240-0398 | 27 |
| (312) 240-04** | (312) 240-0400 - (312) 240-0498 | 28 |
| (312) 240-05** | (312) 240-0500 - (312) 240-0590 | 20 |
| (312) 240-06** | (312) 240-0630 - (312) 240-0688 | 9 |
| (312) 240-07** | (312) 240-0700 - (312) 240-0799 | 22 |
| (312) 240-08** | (312) 240-0801 - (312) 240-0899 | 35 |
| (312) 240-09** | (312) 240-0908 - (312) 240-0998 | 27 |
US Phone Directory: (312) 240-0***
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