| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (312) 944-40** | (312) 944-4000 - (312) 944-4099 | 46 |
| (312) 944-41** | (312) 944-4100 - (312) 944-4196 | 50 |
| (312) 944-42** | (312) 944-4200 - (312) 944-4299 | 44 |
| (312) 944-43** | (312) 944-4300 - (312) 944-4397 | 52 |
| (312) 944-44** | (312) 944-4400 - (312) 944-4499 | 54 |
| (312) 944-45** | (312) 944-4505 - (312) 944-4596 | 39 |
| (312) 944-46** | (312) 944-4600 - (312) 944-4697 | 45 |
| (312) 944-47** | (312) 944-4700 - (312) 944-4795 | 54 |
| (312) 944-48** | (312) 944-4803 - (312) 944-4898 | 44 |
| (312) 944-49** | (312) 944-4900 - (312) 944-4998 | 43 |
US Phone Directory: (312) 944-4***
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