| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (815) 521-10** | (815) 521-1000 - (815) 521-1099 | 66 |
| (815) 521-11** | (815) 521-1100 - (815) 521-1198 | 60 |
| (815) 521-12** | (815) 521-1200 - (815) 521-1299 | 76 |
| (815) 521-13** | (815) 521-1300 - (815) 521-1399 | 58 |
| (815) 521-14** | (815) 521-1400 - (815) 521-1499 | 57 |
| (815) 521-15** | (815) 521-1500 - (815) 521-1599 | 69 |
| (815) 521-16** | (815) 521-1600 - (815) 521-1699 | 66 |
| (815) 521-17** | (815) 521-1701 - (815) 521-1797 | 66 |
| (815) 521-18** | (815) 521-1800 - (815) 521-1899 | 46 |
| (815) 521-19** | (815) 521-1900 - (815) 521-1998 | 41 |
US Phone Directory: (815) 521-1***
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