| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 243-00** | (312) 243-0000 - (312) 243-0098 | 74 |
| (312) 243-01** | (312) 243-0100 - (312) 243-0199 | 79 |
| (312) 243-02** | (312) 243-0202 - (312) 243-0299 | 65 |
| (312) 243-03** | (312) 243-0302 - (312) 243-0397 | 70 |
| (312) 243-04** | (312) 243-0400 - (312) 243-0499 | 65 |
| (312) 243-05** | (312) 243-0501 - (312) 243-0599 | 71 |
| (312) 243-06** | (312) 243-0600 - (312) 243-0699 | 75 |
| (312) 243-07** | (312) 243-0700 - (312) 243-0799 | 74 |
| (312) 243-08** | (312) 243-0800 - (312) 243-0899 | 74 |
| (312) 243-09** | (312) 243-0900 - (312) 243-0999 | 72 |
US Phone Directory: (312) 243-0***
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