| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 218-30** | (312) 218-3000 - (312) 218-3091 | 8 |
| (312) 218-31** | (312) 218-3100 - (312) 218-3183 | 15 |
| (312) 218-32** | (312) 218-3206 - (312) 218-3299 | 15 |
| (312) 218-33** | (312) 218-3301 - (312) 218-3399 | 18 |
| (312) 218-34** | (312) 218-3400 - (312) 218-3495 | 12 |
| (312) 218-35** | (312) 218-3520 - (312) 218-3599 | 15 |
| (312) 218-36** | (312) 218-3605 - (312) 218-3677 | 11 |
| (312) 218-37** | (312) 218-3704 - (312) 218-3787 | 18 |
| (312) 218-38** | (312) 218-3805 - (312) 218-3893 | 19 |
| (312) 218-39** | (312) 218-3901 - (312) 218-3996 | 13 |
US Phone Directory: (312) 218-3***
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