| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 280-00** | (312) 280-0000 - (312) 280-0098 | 59 |
| (312) 280-01** | (312) 280-0101 - (312) 280-0199 | 53 |
| (312) 280-02** | (312) 280-0200 - (312) 280-0298 | 48 |
| (312) 280-03** | (312) 280-0303 - (312) 280-0392 | 20 |
| (312) 280-04** | (312) 280-0400 - (312) 280-0449 | 10 |
| (312) 280-05** | (312) 280-0542 - (312) 280-0558 | 4 |
| (312) 280-06** | (312) 280-0638 - (312) 280-0698 | 6 |
| (312) 280-07** | (312) 280-0700 - (312) 280-0798 | 62 |
| (312) 280-08** | (312) 280-0800 - (312) 280-0897 | 69 |
| (312) 280-09** | (312) 280-0900 - (312) 280-0996 | 48 |
US Phone Directory: (312) 280-0***
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