| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 521-00** | (312) 521-0010 - (312) 521-0067 | 4 |
| (312) 521-01** | (312) 521-0133 - (312) 521-0192 | 4 |
| (312) 521-02** | (312) 521-0225 - (312) 521-0279 | 2 |
| (312) 521-03** | (312) 521-0338 - (312) 521-0393 | 3 |
| (312) 521-04** | (312) 521-0409 - (312) 521-0491 | 11 |
| (312) 521-05** | (312) 521-0501 - (312) 521-0563 | 3 |
| (312) 521-06** | (312) 521-0630 - (312) 521-0696 | 9 |
| (312) 521-07** | (312) 521-0708 - (312) 521-0764 | 5 |
| (312) 521-08** | (312) 521-0804 - (312) 521-0884 | 7 |
| (312) 521-09** | (312) 521-0920 - (312) 521-0980 | 6 |
US Phone Directory: (312) 521-0***
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