| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 421-00** | (312) 421-0000 - (312) 421-0099 | 64 |
| (312) 421-01** | (312) 421-0100 - (312) 421-0198 | 58 |
| (312) 421-02** | (312) 421-0200 - (312) 421-0297 | 54 |
| (312) 421-03** | (312) 421-0301 - (312) 421-0399 | 61 |
| (312) 421-04** | (312) 421-0400 - (312) 421-0497 | 59 |
| (312) 421-05** | (312) 421-0500 - (312) 421-0599 | 59 |
| (312) 421-06** | (312) 421-0600 - (312) 421-0699 | 51 |
| (312) 421-07** | (312) 421-0700 - (312) 421-0799 | 57 |
| (312) 421-08** | (312) 421-0801 - (312) 421-0898 | 57 |
| (312) 421-09** | (312) 421-0900 - (312) 421-0999 | 49 |
US Phone Directory: (312) 421-0***
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