| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (815) 378-00** | (815) 378-0000 - (815) 378-0099 | 54 |
| (815) 378-01** | (815) 378-0100 - (815) 378-0199 | 55 |
| (815) 378-02** | (815) 378-0201 - (815) 378-0294 | 43 |
| (815) 378-03** | (815) 378-0300 - (815) 378-0397 | 52 |
| (815) 378-04** | (815) 378-0400 - (815) 378-0498 | 55 |
| (815) 378-05** | (815) 378-0501 - (815) 378-0599 | 56 |
| (815) 378-06** | (815) 378-0601 - (815) 378-0699 | 49 |
| (815) 378-07** | (815) 378-0700 - (815) 378-0798 | 41 |
| (815) 378-08** | (815) 378-0800 - (815) 378-0897 | 54 |
| (815) 378-09** | (815) 378-0901 - (815) 378-0998 | 47 |
US Phone Directory: (815) 378-0***
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