| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 337-30** | (312) 337-3000 - (312) 337-3099 | 57 |
| (312) 337-31** | (312) 337-3100 - (312) 337-3196 | 54 |
| (312) 337-32** | (312) 337-3200 - (312) 337-3297 | 49 |
| (312) 337-33** | (312) 337-3300 - (312) 337-3399 | 71 |
| (312) 337-34** | (312) 337-3400 - (312) 337-3498 | 50 |
| (312) 337-35** | (312) 337-3500 - (312) 337-3599 | 49 |
| (312) 337-36** | (312) 337-3600 - (312) 337-3699 | 53 |
| (312) 337-37** | (312) 337-3700 - (312) 337-3795 | 62 |
| (312) 337-38** | (312) 337-3800 - (312) 337-3899 | 64 |
| (312) 337-39** | (312) 337-3900 - (312) 337-3997 | 59 |
US Phone Directory: (312) 337-3***
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