| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 640-00** | (312) 640-0000 - (312) 640-0099 | 68 |
| (312) 640-01** | (312) 640-0100 - (312) 640-0195 | 48 |
| (312) 640-02** | (312) 640-0201 - (312) 640-0299 | 54 |
| (312) 640-03** | (312) 640-0300 - (312) 640-0399 | 68 |
| (312) 640-04** | (312) 640-0401 - (312) 640-0499 | 68 |
| (312) 640-05** | (312) 640-0500 - (312) 640-0599 | 74 |
| (312) 640-06** | (312) 640-0600 - (312) 640-0699 | 72 |
| (312) 640-07** | (312) 640-0700 - (312) 640-0799 | 70 |
| (312) 640-08** | (312) 640-0800 - (312) 640-0899 | 68 |
| (312) 640-09** | (312) 640-0900 - (312) 640-0999 | 68 |
US Phone Directory: (312) 640-0***
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